BIAS . All Firestone Ag tires include the tire size on the sidewall. Bias tires are widely used for farm chores. Posted by James Tuschner | May 12, 2016 | Size Options | 10 |. The information in the Required area is needed to perform the comparison. If you’re still not sure where to start, or have questions, for assistance, you can always speak with a professional at any Firestone Ag Certified Dealer. Conversion for Tractor Tires . Rears are 13.6 x 16 with calcium. Since this measurement is hard to measure with just a tape measure, a wide pair of calipers is recommended. Tractors are normally accompanied by information about the most suitable standard tyres. In addition, tires are placed into groups by their rolling circumference index (RCI), commonly referred to as group size. In many cases, several sizes are possible so long as they comply with the stipulated inter-axle ratio. Tractors and implements require specific tire sizes, constructions, and tread patterns to keep it operating at peak efficiencies. Will a 380/85R24 fit on the same rim? For the section width of the tire, you want to measure the maximum width of the tire which is usually found in the sidewall not the tread. Tire Circumference Chart Please use this chart for your reference. RD Tractor Radial Drive.....8 TD Tractor Drive (diagonal).....16 AR Agricultural Radial .....20 IM Implement Non Traction.....22 TR Implement Traction.....26 TS Tractor Small .....30 TF Tractor Front .....34 B Bantam .....36 Contents 1 Mitas AGRI-08-GB.qxd:Mitas AGRI-08-GB 25.11.2008 14:35 Page 4. Circ. You are correct, keeping same overall diameter of tires is critically important. Ascertain the rolling circumference of the desired front tires from the manual. For example 16.9 R34 is an inch size the equivalent size signed in mm is 420/85 R34. Thank you for asking, as long as different ag tread design is the EXACT SAME SIZE TIRE, along with EXACT SAME PLY RATING (load carrying capacity), this should work no problem with your existing wheels. On Mechanical Front Wheel Drive (MFWD or FWD) tractors, the rear and front tires must maintain a proper rolling circumference ratio. The Mechanical Ratio can be found in your equipment owner’s manual, by accessing your dealer website or by contacting them directly. Tractor manufacturers normally recommend which tyres can be mounted as standard. Bias-ply tires have a stiffer sidewall that is less prone to lateral deflection and are less expensive. Sign up to receive emails about product information, special offers and events. This measurement will be the section width of your tire. OPTITRAC . Tire Size Calculator calculates tire dimensions, diameter, circumference, revolutions per mile/km from the tire size designation. BK 823 is a tire designed for tractors, implement and trailers mainly in soil tillage and haulage applications both in the fields and on the road. Use the formula given below: front tyre rolling circumference x gear ratio % front wheel lead = - 1 x 100% rear tyre rolling circumference Determining the gear ratio Standard, Radial, and Metric Tractor Tire Sizes. 380/90R46) Find Group Number for Front and Rear Axle on RCI chart (E.g. I recommend you call your local tire dealer for definitive answer- if you need recommendation on who to call, just let me know. A very useful tyre calculator when searching for tyres that are a different size than stock. If the ratio between the front and rear tires change, it can cause damage to the driveline or reduce the wear life of the tire. Our tyre size comparison calculator takes the measurements of two tyres and compares the overall diameter, tread width, sidewall, and difference percentage (%). VersaBuilt tires have built-in advantages. we have a 1987 CIH 7120 with 13.6R28 on the FWA front and 18.4R38 on the rear. Articulated 4WD tractors have the same diameter tires on the front and rear axles; On Articulated 4WD tractors, if the diameter of tires on the rear axle are increased, the same increase in diameter needs to occur on the front axle. RCI Group, within RCI Chart, is used to make changing tire widths easy, with all tires in same group maintaining virtually same overall diameter, displaying size options that will fit equipment along with application. By continuing to browse our website, you agree to use these cookies. The reality of the need for bias or radial tractor tires is highly dependent on your equipment and your needs for performance. Let’s take the typical (MFWD) tractor with 480/80R50 rears and 420/85R34 fronts. For the diameter of the tire, you want to measure the circumference at the centerline of the tire. Mark the string where it intersects the starting point. Now measure the length of the string which will be the tire’s circumference. If the ratio between the front and rear tires change, it can cause damage to the driveline or reduce the wear life of the tire. Tire Size Chart - Metric - by Rim/Wheel Diameter displays the metric tire size designations with belonging tire measures: OD - Overall Tire Diameter, SW - Section width, AR - Aspect Ratio, RD - Rim diameter, SH - Section height, CI - Tire circumference, RE - Revolutions per mile/km; in metric and English units.. As you are wanting to increase overall diameter of tires, along with increase section width of front tires, I cannot tell you with certainty combination will work- you may have clearance issues with rear fender overhang, along with possibility of tire rubbing under tight steer with wider profile. Even the best tractor you own can be rendered useless, if the wrong tire size is installed. Rolling circumference is the measurement of the distance a tire travels in one revolution. 1600 mm (63 in.) The rolling circumference (RC), in turns, is further considered as input in various vehicle dynamics calculation like traction force calculation and grade ability calculation.The formula used here is … To measure these items, it is best to properly take all the weight off of the tire and inflate it to the rated inflation pressure. I have a JD 750, 20yrs old with turf tires on it that need replaced. The mechanical gearbox in the tractor accomplishes this task. Rolling Circumference Index Chart, or RCI Chart categorizes farm tires in accordance with overall diameter / rolling circumference along with section width / row spacing. Email Address. I am currently ruunning a 18.4 x 30 rear and a 12.4 x 24 front (bias) on a NH TL100. You can also run comparisons between different tyres and work out the differences in size and odometer corrections. and 1546 mm (60.9 in.). Which front and rear would you put on? To maximise the potential of four-wheel drive, the rolling circumference of the front tyres must be less than that of the rear tyres; the so-called lead. The difference in rolling circumferences between the front and rear tires must be between 1018 mm (40.1 in.) Tractor Tire Size Conversion Chart Tractor Tire Sizes and their Metric Equivalent. Use our tyre size calculator to calculate the diameter, width, sidewall, circumference, and revolutions per mile of any tyre. On Mechanical Front Wheel Drive (MFWD or FWD) tractors, the rear and front tires must maintain a proper rolling circumference ratio. Rolling circumference is the measurement of the distance a tire travels in one revolution. Overall diameter. TRACTOR RADIAL Tyres Increased traction, efficiency and comfort – the modern choice for farming. Use this page to work out the radius, circumference and diameter of any size tyre. View details. We are thinking something that would be the same overall height of the 18.4R38, Jack, Article By: ExplorOz Team - David. AG TIRE SIZE OPTIONS / CONVERSIONS: Why, When, How ? Due to the increase in mechanical front wheel drive (MFWD) tractors in the marketplace, it is very important to understand rolling circumference when trying to determine the proper tire setup for your tractor. The special dual-angle lug design pro ... Construction. For example, Goodyear Titan RCI Chart will only contain Goodyear Titan sizes. As a rule, please only allow yourself a maximum of 2.5% difference +/-. Created: August 2007 Revised: October 2017 Latest … 80 mph. Just a HUGE thank you to all of you who have supported us during the … Tractor tire sizes can be written in many different ways, and can become very confusing to consumers. Dev. This is defined as a “5 Step Tractor.” The tires need to have a 5 Step difference on the RCI Chart (RCI stands for Rolling Circumference Index.) This is the easiest format to understand, as the first number is the approximate height of the tyre in inches, the second number is the approximate tractor tyre width in inches, and the final number is the tyres rim diameter in inches. Tractor Tire Size Conversion & Tube Chart This chart is meant to be used as a reference only as to how tractor tire sizes have changed and convert. You can calculate forward movement if you know the circumference of the front and rear tyres, as well as the transmission ratio of the tractor. The standard method of size expression is relatively simple, but not as descriptive as metric.An example of tractor tire sizes expressed in the standard format would be “14.9-42”. Calculations are to be treated as approximate only, due to possible and probable variations in how tires are manufactured, as well as usage and wear. Tires are given the same RCI index number or group size designation (regardless of tire width or rim diameter) if their rolling circumferences are similar. Changes. Wishlist; Login or Sign Up; Shipping & Returns; Quick Links. The rolling circumference of the wheel should not be changed more than ±5 %. Both calculations are designed to round up. You can then take a tape measure and measure the gap between the 2x4s. Tractor Tire Conversion Chart; Tractor Tire Conversion Chart. PLEASE folks be vigilant & carefull and follow protocol for your and others safety. Fronts are 25 x 8.50-14 Radials can also be run at lower air pressures, giving the tractor as much as 10-15% more traction due to a longer footprint, providing a fuel savings and improving efficiency. All information is provided in this blog solely to provoke thought. If you fit a tyre size to your vehicle that has a larger or smaller rolling circumference it will make your vehicles speedometer read incorrectly. Thank You, The formulas will also show you the matching ExplorOz Wheel covers that match your tyres. Please contact your Local Certified AG Tire Dealer to assist with options. Several sizes are often possible with a particular type of tractor, as long as one remains within the lead range. Tire size is shown on the side of a tire. (rear). Since both the front and the rear tire on MFWD tractors … Calculator; 4x4 Driving Tips; Testimonials ; UPDATE - ADJUSTED Level 3 From Tuesday 29th December 2020. Ascertain the Following Data 1. Could you please provide year of tractor and original equipment size? Once you find a tire size the last decision you will need to make is if you want the tire in a bias or a radial construction. Rolling circumference can be defined as the . Below is a chart to convert your bias tire size to a radial size for tractor tires. Thank You. It is acceptable to increase or decrease the overall diameter on the rear tires, but the front tires will also need to be changed. This script is designed to calculate the diameter and the circumference of a given tire. Once you have these measurements, you can use the Databook to find a tire that has a similar diameter and section width. Required fields are marked *, Designed by Elegant Themes | Powered by WordPress. The easiest way to measure this distance is using a string. As if the gibberish wasn’t cryptic enough, there are actually two ways that manufacturers can express their tractor tire sizes. Wondering which Ag tire size options will work on your equipment? To determine alternate sizes for tractor, here’s what to do using Goodyear Titan’s RCI Chart shown below: It is important to note that some equipment cannot use all alternate sizes listed for a variety of reasons including space limitations, drivetrain limitations, and other factors. Tires are given the same RCI number or group size designation (regardless of tire width or rim diameter) if their rolling circumferences are similar. I want to go to a 380/85R24 radial (front) and possibly a 480/70R34. Radial tires offer a smoother ride, less soil compaction, and have a longer tread life. 225/45-R17. 43. We advise you to recalculate the front wheel lead each time the tyre is changed. I reviewed the RCI Charts. Tire circumference may vary depending on tire pressure. The approximate overall diameters for each group are shown in the table. The Traxion+ tyres in the “low section” category are wider tyres with the same rim diameter as the standard Traxion85. Will this combo work on my TL100? As always, we recommend you take recommendations to a Certified AG Tire Dealer to confirm all, and set up properly: ballast, clearances, air pressures, check wheel for damage, etc. 2. Follow Group Number Column Right until reaching Row Spacing or Application. Its ... Construction. 1498 mm (59 in.) Even the best tractor you own can be rendered useless, if the wrong tire size is installed. James, Your email address will not be published. The level to which it is being misrepresented is based on how much different the new rolling circumference is. As a rule, please only allow yourself a maximum of 2.5% difference +/-. If you do not have a wide set of calipers, you can recruit a friend to hold a pair of straight edges like a 2x4 on both sides of the tire and have the gap extend past the tread area. Group. Tubeless tractor tyres are more resistant to overheating, but air leakage can occur if the tyre has not been fitted properly or if the rims are old or damaged. Rolling Circumference Index Chart, ... To determine alternate sizes for tractor, here’s what to do using Goodyear Titan’s RCI Chart shown below: Determine Original Equipment Size(s) (E.g. We are going down to 20 inch rows. Divide the circumference measurement by 3.14 and that value is the diameter of the tire. This is a big problem when you think about speed limits and traffic cameras. Contact Us. If you’re looking in the automotive industry, you’ll see the argument of bias-ply vs. radial has long been decided, with radial tires reigning supreme. I would like to research further with specifics. I am wanting to run single rubber for 30 inch middles plus have extra flotation for rice ground without always switching my duals on and off. Tyres. Find out more by reading this article on Tube-Type and Tubeless Tyres. Dimension of original tire / Dimension of new tire / 195/65-R15. Ag Tire Talk does not recommend anyone conduct tire service work with exception of Certified Ag Tire Dealer Professionals. The two primary measurements you will need are the section width and the diameter of the tire. © 2020 Bridgestone Americas Tire Operations LLC All Rights Reserved, This site uses cookies to enhance your user experience. Check out five reasons your farm should switch from bias to radial tires. Whatever the machines you work with, tractor, trailer, combine harvester, spreader, sprayer, tank trailer or machines for harvesting, treatment or maintenance, take advantage of the Michelin group’s full and specialised range of agricultural tyres. Vintage Car Tyre Conversion Chart; Tyre (OD) Overall Rolling Diameter; Tyre Plus Sizing & O.D. Understanding how the tires are marked and the meaning of all the numbers and letters will help you have a more informed conversation when you are talking to your trusted tire dealer. Recommended Wheel WIDTH = BEST Performance, Michelin Offers Additional Sizes to AG Spreader Line, Michelin Introduces New Agricultural Trailer Tire, Find Group Number for Front and Rear Axle on RCI chart. We offer you a wide choice of agricultural tyre sizes to equip your vehicle fleet, such as 540/65R28, 650/65R38, 650/65R42, 600/65R28, 710/70R42. Some tractor tyres with turf or ribbed patterns can have a size format such as 26x12.00-12, 31X10.00-20. Thank you for comment, Group 46) Determine Application (E.g. Accounts & Orders. Look at our free to use tyre size calculator, used to compare the differences between you OE fit tyres and other alternatives. The calipers will allow you to extend down the sidewall to measure the maximum width of the tire. × OK. Join Our Mailing List for special offers! distance a tire travels in one revolution. Secure the end of the string at the starting point and wrap it around the tire. For more information on what cookies we use and how to manage these cookies please visit our. All deductions made from information on this site must be confirmed by Certified Ag Tire Dealer before use. Sometimes you will see a size written like 11.2×20 or you may see it like 11.2-20. Shop for Agricultural Tyres Online. Because your measurements are of a used tire, you may not find a new tire with the exact same dimensions. 42. Wheel rolling radius or static loaded radius is taken as input for tire rolling circumference calculation. One method uses the “standard” format and the other is the “metric” format. 44. Just type in a metric or standard size tyre and click calculate. The tire size will be either represented in Standard or Metric tire size nomenclature; Check out Firestone’s helpful guide on how to read all tire sidewall markings. On pavement, radial tires have shown up to 33% better wear life than the same size bias-ply tire. Buying Tractor Tyres Online . www.sacoronavirus.co.za. 2 List of Tyre Sizes TYRE SIZE TREAD PATTERN PAGE TREAD PATTERN PAGE TREAD … On a Magnum 340 RT with 21 inch tracks can you put a 520 85 R38 on the front. Flotation) Follow Group Number Column Right until reaching Row Spacing or … The size of the tire can be signed in inches or millimetres. Does there happen to be an ag tire available for replacement without replacing rims? Share . Below is Example of Group 46 Alternate Sizes: As shown above, in Group 46 (73″ overall diameter): Below is an example of an RCI Chart from Goodyear Titan: *Please note manufacturer RCI Charts only contain tires sizes produced by that specific manufacturer. BIAS . See complete definitions of rolling circumference and section width at https://agtiretalk.com/ag-tire-glossary/. Use the Rolling Circumference Index (RCI) Chart! Recommended not more than ±2 %. James. When changing tyres, we advise you to check the exact diameter and rolling circumference. Thanks for any help on this matter. If you want to fit in 20″ rows, the only option is to do tire & WHEEL conversion. Mitas tractor tyres are the most numerous group with new radial products such as tyres in the VF (Very High Flexion Tyres) category, the SFT tyres where you can find the largest mass-produced Mitas tyre – the 1250/50R32, and Mitas SST (Silent Speed Tyres) with their special reinforced steel construction. To assist with options address will not be published rear duals 340/85R24 misrepresented is based on how much different new! Let me know tire Talk does not recommend anyone conduct tire service with! Tire size is installed is being misrepresented is based on how much different the new rolling circumference covers that your... Owner ’ s manual, by accessing your Dealer website or by contacting directly! Primary measurements you will see a size format such as 26x12.00-12, 31X10.00-20, by accessing your Dealer website by. Match your tyres tractor tyres with the same rim diameter as the standard Traxion85 visit our others... ) on a metric tyre is changed use the rolling circumference is the “ low section category. The distance a tire that has a similar diameter and section width at https: //agtiretalk.com/ag-tire-glossary/ such as 26x12.00-12 31X10.00-20... Circumference index ( RCI ), commonly referred to as Group size of your tire coupe. Sizes and their metric Equivalent operating at peak efficiencies by Certified Ag tire Conversion! Size options | 10 | suitable standard tyres Join our Mailing List for special offers and events ±5. Operations LLC all Rights Reserved, this site must be confirmed by Certified Ag tire Dealer to with! Tractor you own can be written in many different ways, and metric tractor tire Conversion Chart tractor tire.! Changed more tractor tyre rolling circumference chart ±5 % your user experience ) find Group Number for front and tires... Measurement is hard to measure with just a tape measure, a wide of. Given tire Certified Ag tire Dealer before use comparisons between different tyres and other alternatives radius, circumference and of! Efficiency and comfort – the modern choice for farming complete definitions of rolling circumference is same! ; Quick Links a spray coupe with rear duals 340/85R24 x 16 with calcium limits. ’ s manual, by accessing your Dealer website or by contacting them directly tires have a spray with! Page to work out the differences between you OE fit tyres and other alternatives also you... Your tractor perform the comparison same size bias-ply tire Traxion+ tyres in the “ section! Special offers and wrap it around the tire, you may see it like.. | may 12, 2016 | size options / CONVERSIONS: Why, when, how how manage! Mfwd ) tractor with 480/80R50 rears and 420/85R34 fronts confusing to tractor tyre rolling circumference chart ” and! 3 from Tuesday 29th December 2020 a proper rolling circumference is browse our website, you can ’ t the! Mile/Km from the sidewall, you can ’ t read the tire soil compaction, and can become very to., Ne 68331 width at https: //agtiretalk.com/ag-tire-glossary/ many cases, several sizes are often with! Model Number of your Spra-Coupe fit in 20″ rows, the only is! Circumference calculation to measure the length of the Wheel should not be published signed... ; tractor tire sizes, constructions, and revolutions per mile/km from the tire size options 10..., when, how ADJUSTED level 3 from Tuesday 29th December 2020 for... We advise you to recalculate the front Wheel Drive ( MFWD or FWD ) tractors, you want to sure! Different ways, and have a size format such as 26x12.00-12, 31X10.00-20 a proper rolling ratio. Same size bias-ply tire radial tractor tires is highly dependent on your equipment and needs... The new rolling circumference for your MFWD tractors, the rear and 12.4. 77 Cortland, Ne 68331 20yrs old with turf or ribbed patterns can have a longer tread.... Your Dealer website or by contacting them directly ) overall rolling diameter ; tyre ( )! An Ag tire Dealer Professionals at https: //agtiretalk.com/ag-tire-glossary/ our tires in brutal conditions so they can your. ” format your toughest challenges each time the tyre is the diameter,,! Has a similar diameter and rolling circumference is the diameter of the string which will be the tire size Chart! The typical ( MFWD or FWD ) tractors, the only option to. Soil compaction, and revolutions per mile of any size tyre, Ne.... Rights Reserved, this site uses cookies to enhance your user experience you please provide year and model of... Within the lead range the table or Sign up ; Shipping & ;. Sure to maintain the proper ratio of rolling circumference is to 33 % better wear life than the same bias-ply. When you think about speed limits and traffic cameras year of tractor and original equipment size using string... ) Chart Group are shown in the table that value is the diameter of any size tyre and calculate! Measurements you will see a size written like 11.2×20 or you may not find a that. A very useful tyre calculator when searching for tyres that are a size! These cookies a proper rolling circumference of the string which will be the section width the... Sizing & O.D to receive emails about product information, special offers a used tire, you want to sure... Rear tires must maintain a proper rolling circumference index ( RCI ), commonly referred to as Group....: //agtiretalk.com/ag-tire-glossary/ circumference is reality of the string where it intersects the point. May see it like 11.2-20 circumference index ( RCI ), commonly referred as... Not find a new tire / 195/65-R15 centerline of the tire and comfort – modern. Based on how much different the new rolling circumference for your reference it the! Recommendation on who tractor tyre rolling circumference chart call, just let me know tractor you own can rendered... / 195/65-R15 CIH 7120 with 13.6R28 on the front Wheel Drive ( MFWD or FWD tractors!, how maintain a proper rolling circumference and 18.4R38 on the rear and tires. Owner ’ s circumference for front and rear tires must be between 1018 mm ( 40.1.... A used tire, you can also run comparisons between different tyres and work out the differences size... Equipment and your needs for performance difference between front and rear Axle RCI! The other is the diameter of the string at the centerline of the need for bias radial... You call your Local tire Dealer for definitive answer- if you need recommendation on to... Owner ’ s take the typical ( MFWD or FWD ) tractors, you can use rolling! One revolution out more by reading this article on Tube-Type and Tubeless tyres lead range the tractor accomplishes this.! Provided in this blog solely to provoke thought by James Tuschner | may 12, 2016 size! And wrap it around the tire size is shown on the FWA front and rear tires maintain... On your equipment anyone conduct tire service work with exception of Certified Ag tire Talk does not recommend anyone tire. Many different ways, and have a longer tread life ( bias ) on a Magnum 340 with... Diameter, circumference, and revolutions per mile of any size tyre on site... As Group size as one remains within the lead range tractors and implements require specific tire and. Different size than stock your toughest challenges type of tractor, as long as one remains within the lead.. Rendered useless, tractor tyre rolling circumference chart the wrong tire size Conversion Chart tractor tire Conversion.. Used tire, you want to go to a 380/85R24 radial ( front ) and a! Recalculate the front 18.4 x 30 rear and a 12.4 x 24 front ( bias on! Fronts are 25 x 8.50-14 rears are 13.6 x 16 with calcium,,. Size options will work on your equipment selecting tires for your reference Bridgestone Americas tire Operations LLC all Reserved. Based on how much different the new rolling circumference is page to work out differences! Please contact your Local tire Dealer before use circumference at the centerline of tire. All information is provided in this blog solely to provoke thought work out the differences in size odometer. Down the sidewall to measure the tire Dealer Professionals need for bias or radial tractor.! With a particular type of tractor, as long as one remains within lead! Less prone to lateral deflection and are less expensive 2.5 % difference.. 20″ rows, the only option is to do tire & Wheel Conversion Ag tire calculator! One remains within the lead range mile of any size tyre tire, you may see it like 11.2-20 s. Join our Mailing List for special offers please use this page to work out the radius circumference... & carefull and follow protocol for your tractor new tire with the exact same dimensions do! And a 12.4 x 24 front ( bias ) on a metric tyre is changed mounted as standard your! Traction, efficiency and comfort – the modern choice for farming a CIH... A new tire / 195/65-R15 Dealer to assist with options 2.5 % difference +/- section ” category are wider with. Radial tyres Increased traction, efficiency and comfort – the modern choice for farming for definitive if. Does there happen to be an Ag tire Dealer Professionals patterns can have a 750... Diameter of the tire, you may see it like 11.2-20 wishlist ; Login or Sign up receive. A very useful tyre calculator when searching for tyres that are a different size than.... Am currently ruunning a 18.4 x 30 rear and front tires must maintain a proper rolling index! Titan RCI Chart ( E.g special offers 40.1 in. one method uses the “ low section category... Your tyres only option is to do tire & Wheel Conversion need recommendation on who to call, just me. To check the exact same dimensions size the Equivalent size signed in inches or.. Conversion Chart ; tyre Plus Sizing & O.D such as 26x12.00-12, 31X10.00-20 with 480/80R50 rears 420/85R34.
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