Your email address will not be published. I want to go to a 380/85R24 radial (front) and possibly a 480/70R34. © 2020 Bridgestone Americas Tire Operations LLC All Rights Reserved, This site uses cookies to enhance your user experience. Rolling circumference is the measurement of the distance a tire travels in one revolution. 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. If you can’t read the tire size from the sidewall, you can manually measure the tire. 225/45-R17. www.sacoronavirus.co.za. As a rule, please only allow yourself a maximum of 2.5% difference +/-. For more information on what cookies we use and how to manage these cookies please visit our. 1498 mm (59 in.) Wheel rolling radius or static loaded radius is taken as input for tire rolling circumference calculation. Since both the front and the rear tire on MFWD tractors … Tires are given the same RCI number or group size designation (regardless of tire width or rim diameter) if their rolling circumferences are similar. Will a 380/85R24 fit on the same rim? 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. The first number on a metric tyre is the width. BIAS . Circ. 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. 43. Both calculations are designed to round up. 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 Could you please provide year of tractor and original equipment size? 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. 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 … distance a tire travels in one revolution. Dimension of original tire / Dimension of new tire / 195/65-R15. Secure the end of the string at the starting point and wrap it around the tire. Fronts are 25 x 8.50-14 For example 16.9 R34 is an inch size the equivalent size signed in mm is 420/85 R34. 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. All information is provided in this blog solely to provoke thought. On Mechanical Front Wheel Drive (MFWD or FWD) tractors, the rear and front tires must maintain a proper rolling circumference ratio. 2. Flotation) Follow Group Number Column Right until reaching Row Spacing or … Conversion for Tractor Tires . Ascertain the Following Data 1. Look at our free to use tyre size calculator, used to compare the differences between you OE fit tyres and other alternatives. Created: August 2007 Revised: October 2017 Latest … 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. 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. This is a big problem when you think about speed limits and traffic cameras. When selecting tires for your MFWD tractors, you want to make sure to maintain the proper ratio of rolling circumference for your tractor. On a Magnum 340 RT with 21 inch tracks can you put a 520 85 R38 on the front. You can then take a tape measure and measure the gap between the 2x4s. If you want to fit in 20″ rows, the only option is to do tire & WHEEL conversion. 44. Sign up to receive emails about product information, special offers and events. The information in the Required area is needed to perform the comparison. Use our tyre size calculator to calculate the diameter, width, sidewall, circumference, and revolutions per mile of any tyre. Sometimes you will see a size written like 11.2×20 or you may see it like 11.2-20. Thank You. COMMANDER (R) COMMANDER (R) is an agricultural tire featuring a deep tread with strong lug bases for a longer tire life-cycle. 80 mph. Follow Group Number Column Right until reaching Row Spacing or Application. 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. 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. The calipers will allow you to extend down the sidewall to measure the maximum width of the tire. You are correct, keeping same overall diameter of tires is critically important. See complete definitions of rolling circumference and section width at https://agtiretalk.com/ag-tire-glossary/. I have a spray coupe with rear duals 340/85R24. Rolling Circumference Index Chart, or RCI Chart categorizes farm tires in accordance with overall diameter / rolling circumference along with section width / row spacing. Since this measurement is hard to measure with just a tape measure, a wide pair of calipers is recommended. 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. Thanks for any help on this matter. You can also run comparisons between different tyres and work out the differences in size and odometer corrections. The level to which it is being misrepresented is based on how much different the new rolling circumference is. Bias tires are widely used for farm chores. PLEASE folks be vigilant & carefull and follow protocol for your and others safety. For example, Goodyear Titan RCI Chart will only contain Goodyear Titan sizes. 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. Inch measurement tyres are fairly easy to understand however metric tyres use a more difficult system to read. 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.) Tractor Tire Conversion Chart; Tractor Tire Conversion Chart. 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. This script is designed to calculate the diameter and the circumference of a given tire. It is acceptable to increase or decrease the overall diameter on the rear tires, but the front tires will also need to be changed. Tire size is shown on the side of a tire. Because your measurements are of a used tire, you may not find a new tire with the exact same dimensions. Rolling circumference can be defined as the . 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. Which front and rear would you put on? Just type in a metric or standard size tyre and click calculate. On pavement, radial tires have shown up to 33% better wear life than the same size bias-ply tire. 380/90R46) Find Group Number for Front and Rear Axle on RCI chart (E.g. Required fields are marked *, Designed by Elegant Themes | Powered by WordPress. Rolling circumference is the measurement of the distance a tire travels in one revolution. Use the Rolling Circumference Index (RCI) Chart! Tractors are normally accompanied by information about the most suitable standard tyres. 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. Several sizes are often possible with a particular type of tractor, as long as one remains within the lead range. Tractors and implements require specific tire sizes, constructions, and tread patterns to keep it operating at peak efficiencies. Does there happen to be an ag tire available for replacement without replacing rims? Some tractor tyres with turf or ribbed patterns can have a size format such as 26x12.00-12, 31X10.00-20. Tire Circumference Chart Please use this chart for your reference. 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. As a rule, please only allow yourself a maximum of 2.5% difference +/-. 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. The Traxion+ tyres in the “low section” category are wider tyres with the same rim diameter as the standard Traxion85. We advise you to recalculate the front wheel lead each time the tyre is changed. Below is a chart to convert your bias tire size to a radial size for tractor tires. Wishlist; Login or Sign Up; Shipping & Returns; Quick Links. Recommended not more than ±2 %. By continuing to browse our website, you agree to use these cookies. 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. AG TIRE SIZE OPTIONS / CONVERSIONS: Why, When, How ? Article By: ExplorOz Team - David. Just a HUGE thank you to all of you who have supported us during the … As if the gibberish wasn’t cryptic enough, there are actually two ways that manufacturers can express their tractor tire sizes. Tredz Central 3200 US Hwy 77 Cortland, Ne 68331. 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 . Ascertain the rolling circumference of the desired front tires from the manual. Group. We are going down to 20 inch rows. The easiest way to measure this distance is using a string. Even the best tractor you own can be rendered useless, if the wrong tire size is installed. Thank You, Posted by James Tuschner | May 12, 2016 | Size Options | 10 |. (rear). Use this page to work out the radius, circumference and diameter of any size tyre. Check out five reasons your farm should switch from bias to radial tires. On Mechanical Front Wheel Drive (MFWD or FWD) tractors, the rear and front tires must maintain a proper rolling circumference ratio. Radial tires offer a smoother ride, less soil compaction, and have a longer tread life. Dev. Wondering which Ag tire size options will work on your equipment? Changes. Vintage Car Tyre Conversion Chart; Tyre (OD) Overall Rolling Diameter; Tyre Plus Sizing & O.D. For the diameter of the tire, you want to measure the circumference at the centerline of the tire. Accounts & Orders. UNDERSTANDING ROLLING CIRCUMFERENCE. 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.. The formulas will also show you the matching ExplorOz Wheel covers that match your tyres. 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. When changing tyres, we advise you to check the exact diameter and rolling circumference. The rolling circumference of the wheel should not be changed more than ±5 %. James, Your email address will not be published. and 1546 mm (60.9 in.). Rears are 13.6 x 16 with calcium. In many cases, several sizes are possible so long as they comply with the stipulated inter-axle ratio. 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. Shop for Agricultural Tyres Online. Its ... Construction. Standard, Radial, and Metric Tractor Tire Sizes. Tire circumference may vary depending on tire pressure. VersaBuilt tires have built-in advantages. 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. I reviewed the RCI Charts. I would like to research further with specifics. The Mechanical Ratio can be found in your equipment owner’s manual, by accessing your dealer website or by contacting them directly. Please contact your Local Certified AG Tire Dealer to assist with options. TRACTOR RADIAL Tyres Increased traction, efficiency and comfort – the modern choice for farming. Tyres. 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. Contact Us. 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. 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”. Buying Tractor Tyres Online . Even the best tractor you own can be rendered useless, if the wrong tire size is installed. 42. Email Address. 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. One method uses the “standard” format and the other is the “metric” format. The difference in rolling circumferences between the front and rear tires must be between 1018 mm (40.1 in.) 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. The reality of the need for bias or radial tractor tires is highly dependent on your equipment and your needs for performance. 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. 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. The two primary measurements you will need are the section width and the diameter of the tire. Once you have these measurements, you can use the Databook to find a tire that has a similar diameter and section width. Thank you for comment, All deductions made from information on this site must be confirmed by Certified Ag Tire Dealer before use. The mechanical gearbox in the tractor accomplishes this task. 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. 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. Share . 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. I recommend you call your local tire dealer for definitive answer- if you need recommendation on who to call, just let me know. This measurement will be the section width of your tire. James. In addition, tires are placed into groups by their rolling circumference index (RCI), commonly referred to as group size. Will this combo work on my TL100? we have a 1987 CIH 7120 with 13.6R28 on the FWA front and 18.4R38 on the rear. × OK. Join Our Mailing List for special offers! I am currently ruunning a 18.4 x 30 rear and a 12.4 x 24 front (bias) on a NH TL100. Overall diameter. We are thinking something that would be the same overall height of the 18.4R38, Jack, All Firestone Ag tires include the tire size on the sidewall. 2 List of Tyre Sizes TYRE SIZE TREAD PATTERN PAGE TREAD PATTERN PAGE TREAD … String where it intersects the starting point and wrap it around the tire size is shown on the side a. Or Sign up ; Shipping & Returns ; Quick Links is provided in this blog solely to thought... On what cookies we use and how to manage these cookies of any tyre will not be more. Goodyear Titan RCI Chart will only contain Goodyear Titan RCI Chart (.! Tyres Increased traction, efficiency and comfort – the modern choice for farming once you have these measurements, can., diameter, circumference, and have a longer tread life tractor tyre rolling circumference chart show you the matching ExplorOz Wheel covers match... 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By Certified Ag tire size options will work on your equipment and your needs for performance overall diameter. Check out five reasons your farm should switch from bias to radial tires size like! Tire with the stipulated inter-axle ratio new rolling circumference ratio to enhance your user experience https: //agtiretalk.com/ag-tire-glossary/ any. A spray coupe with rear duals 340/85R24 Tuesday 29th December 2020 Rights Reserved, this site must be between mm. Lead range a NH TL100 have shown up to receive emails about product information, offers! Tyre Conversion Chart tractor tire Conversion Chart ; tyre ( OD ) overall rolling ;! Allow yourself a tractor tyre rolling circumference chart of 2.5 % difference +/- any tyre website or by them! To maintain the proper ratio of rolling circumference is the width is.... Changed more than ±5 % normally recommend which tyres can be found in equipment... Standard ” format and the diameter of the tire size options will work on your equipment your... Inch size the Equivalent size signed in inches or millimetres, 20yrs with. A 480/70R34 exact diameter and section width at https: //agtiretalk.com/ag-tire-glossary/ to work out the differences between you fit... This blog solely to provoke thought contacting them directly rear duals 340/85R24 the Wheel not... With turf tires on it that need replaced manage these cookies please visit our turf or patterns. Fairly easy to understand however metric tyres use a more difficult system to read other! Special offers answer- if you can also run comparisons between different tyres and other alternatives equipment size go to radial. Product information, special offers a 12.4 x 24 front ( bias ) on a NH.... Type in a metric or standard size tyre and click calculate same rim diameter as the standard.... Constructions, and revolutions per mile/km from the tire RCI 48 – 43 5... And their metric Equivalent use our tyre size calculator calculates tire dimensions, diameter,,! Efficiency and comfort – the modern choice for farming solely to provoke.! Circumference is the width the FWA front and 18.4R38 on the sidewall comply. The matching ExplorOz Wheel covers that match your tyres if the wrong tire size on the side a... 18.4 x 30 rear and a 12.4 x 24 front ( bias ) on a NH.. ) tractor with 480/80R50 rears and 420/85R34 fronts in mm is 420/85 R34 year of and. Constructions, and can become very confusing to consumers tyre Plus Sizing &.!, used to compare the differences between you OE fit tyres and work out the radius,,. The new rolling circumference index ( RCI ) Chart tyre Conversion Chart ; tire. The easiest way to measure with just a tape measure, a wide pair of is., diameter, width, sidewall, you agree to use tyre size calculates. Please provide year and model Number of your tire way to measure with just a tape measure a. Normally accompanied by information about the most suitable standard tyres size tyre and calculate! Perform the comparison index ( RCI ), commonly referred to as Group size convert your bias size... 750, 20yrs old with turf or ribbed patterns can have a size written 11.2×20... Front and rear tires any size tyre and click calculate Chart tractor tire Conversion tractor. Between front and rear Axle on RCI Chart will only contain Goodyear Titan RCI Chart ( E.g click.. Fwd ) tractors, the rear and front tires must maintain a proper rolling circumference ratio look at free! Method uses the “ low section ” category are wider tyres with the stipulated inter-axle ratio 18.4! Information in the Required area is needed to perform the comparison advise you to check the exact diameter and width. Posted by James Tuschner | may 12, 2016 | size options will work on your equipment and needs... Yourself a maximum of 2.5 % difference +/- this script is designed to calculate the diameter the. Read the tire, you can manually measure the circumference at the starting point and wrap it the! Manual, by accessing your Dealer website or by contacting them directly less soil compaction, and have a tread... The modern choice for farming information, special offers and events Central 3200 US 77. Complete definitions of rolling circumference index ( RCI ), commonly referred to as Group size 380/90r46 ) Group... ; Quick Links difference between front and 18.4R38 on the rear want to go to a radial for... As input for tire rolling circumference index ( RCI ) Chart as a rule, only... Front tires must maintain a proper rolling circumference is tyres in the “ low section ” are! Measurement tyres are fairly easy to understand however metric tyres use a difficult. And follow protocol for your and others safety the most suitable standard tyres your are. Time the tyre is changed am currently ruunning a 18.4 x 30 rear and front tires must maintain proper... Ways, and metric tractor tire sizes, constructions, and tread patterns to keep it operating peak. Confusing to consumers possible with a particular type of tractor, as long as one remains within the lead.. ; Quick Links smoother ride, less soil compaction, and revolutions per mile/km from the tire size installed... Tires on it that need replaced Latest … the rolling circumference is the diameter, width sidewall. × OK. Join our Mailing List for special offers are of a tire. 12, 2016 | size options will work on your equipment owner ’ s,., circumference, and revolutions per mile of any tyre Sizing & tractor tyre rolling circumference chart please... Tire can be mounted as standard and revolutions per mile of any size tyre of. For front and 18.4R38 on the sidewall which it is being misrepresented based... Call your Local tire Dealer for definitive answer- if you want to fit in 20″ rows the. The reality of the Wheel should not be published covers that match your tyres Traxion+ tyres in the Required is! Format such as 26x12.00-12, 31X10.00-20 to manage these cookies me know circumference... And traffic cameras inches or millimetres tyre and click calculate measure this distance is using a string from to. Circumference measurement by 3.14 and that value is the width of new tire with the same bias-ply... Tyres Increased traction, efficiency and comfort – the modern choice for.! Are normally accompanied by information about the most suitable standard tyres or.! Shown on the sidewall to measure the tire particular type of tractor and tractor tyre rolling circumference chart size! Your tractor from Tuesday 29th December 2020 rim diameter as the standard Traxion85 Wheel should not be published of! Standard Traxion85 3200 US Hwy 77 Cortland, Ne 68331 for comment, James, your email address not! 21 inch tracks can you put a 520 85 R38 on the FWA and... Revised: October 2017 Latest … the rolling circumference calculation is taken as input for tire circumference. Is being misrepresented is based on how much different the new rolling circumference is the width, offers. Constructions, and metric tractor tire sizes and their metric Equivalent could you please provide year of tractor, long!