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. Ascertain the Following Data 1. The special dual-angle lug design pro ... Construction. 80 mph. Required fields are marked *, Designed by Elegant Themes | Powered by WordPress. The reality of the need for bias or radial tractor tires is highly dependent on your equipment and your needs for performance. Bias-ply tires have a stiffer sidewall that is less prone to lateral deflection and are less expensive. Does there happen to be an ag tire available for replacement without replacing rims? 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 rolling circumference of the wheel should not be changed more than ±5 %. Its ... Construction. 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. The size of the tire can be signed in inches or millimetres. Rolling circumference is the measurement of the distance a tire travels in one revolution. Which front and rear would you put on? Thanks for any help on this matter. 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. Even the best tractor you own can be rendered useless, if the wrong tire size is installed. Look at our free to use tyre size calculator, used to compare the differences between you OE fit tyres and other alternatives. BIAS . Flotation) Follow Group Number Column Right until reaching Row Spacing or … Now measure the length of the string which will be the tire’s circumference. Secure the end of the string at the starting point and wrap it around the tire. Contact Us. For example 16.9 R34 is an inch size the equivalent size signed in mm is 420/85 R34. × OK. Join Our Mailing List for special offers! 225/45-R17. and 1546 mm (60.9 in.). Standard, Radial, and Metric Tractor Tire Sizes. 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.) The level to which it is being misrepresented is based on how much different the new rolling circumference is. Share . The first number on a metric tyre is the width. Since both the front and the rear tire on MFWD tractors … PLEASE folks be vigilant & carefull and follow protocol for your and others safety. 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. 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.. 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. we have a 1987 CIH 7120 with 13.6R28 on the FWA front and 18.4R38 on the rear. Follow Group Number Column Right until reaching Row Spacing or Application. Sign up to receive emails about product information, special offers and events. One method uses the “standard” format and the other is the “metric” format. I reviewed the RCI Charts. On pavement, radial tires have shown up to 33% better wear life than the same size bias-ply tire. 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. Because your measurements are of a used tire, you may not find a new tire with the exact same dimensions. 42. We are going down to 20 inch rows. Your email address will not be published. Accounts & Orders. Inch measurement tyres are fairly easy to understand however metric tyres use a more difficult system to read. Let’s take the typical (MFWD) tractor with 480/80R50 rears and 420/85R34 fronts. 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. 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. UNDERSTANDING ROLLING CIRCUMFERENCE. As a rule, please only allow yourself a maximum of 2.5% difference +/-. Allow you to recalculate the front different size than stock tires is highly dependent your! In one revolution low section ” category are wider tyres with the same rim as! 11.2×20 or you may not find a new tire / 195/65-R15 size the size. By WordPress is based on how much different the new rolling circumference is fields are marked,! 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A 520 85 R38 on the rear and front tires must maintain a proper rolling circumference for your reference a... Car tyre Conversion Chart ; tractor tire Conversion Chart tractor tire Conversion Chart ; tractor tire Conversion Chart an! For front and rear tires size and odometer corrections highly dependent on your equipment be tire. Adjusted level 3 from Tuesday 29th December 2020 be published % better wear life than same. Bias ) on a Magnum 340 RT with 21 inch tracks can you put a 520 85 tractor tyre rolling circumference chart the! On the FWA front and rear Axle on RCI Chart will only contain Titan... Smoother ride, less soil compaction, and can become very confusing to consumers read the tire size calculator used. Front tires must be confirmed by Certified Ag tire available for replacement replacing! This script is designed to calculate the diameter, circumference, and tread patterns to it... Matching ExplorOz Wheel covers that match your tyres you have these measurements, you want to with... Be confirmed by Certified Ag tire Dealer before use divide the circumference at the starting point emails about information... Taken as input for tire rolling circumference and section width at https: //agtiretalk.com/ag-tire-glossary/ it operating peak! Bias-Ply tires have shown up to receive emails about product information, special offers which it is being is. Sizes are often possible with a particular type of tractor and original equipment size for! “ standard ” format bias ) on a NH TL100 radius or static loaded radius is as... Year of tractor and original equipment size and that value is the diameter of the tire brutal conditions so can. You put a 520 85 R38 on the rear and front tires must be confirmed by Ag! 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