The sidewall height or "aspect ratio" of a 285/75/R16 tyre is 75% of 285mm. 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. Tire Rim . Sometimes you will see a size written like 11.2×20 or you may see it like 11.2-20. Please enter the width, aspect ratio and rim size for your current tyre and proposed new tyre. A very useful tyre calculator when searching for tyres that are a different size then stock. Rolling circumference can be defined as the . Tyres. In MFWD tractors, both the front and rear tires do the work. The information in the Required area is needed to perform the comparison. × 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. Inch measurement tyres are fairly easy to understand however metric tyres use a more difficult system to read. Current Tyre Size Proposed new tyre size; Enter a radial size: E.g. To calculate a metric tyre to height in inches: (#1 x #2 / 2540 x 2) + (#3). Since the front tires are smaller than the rear tires, the front tires have to rotate faster to cover the same distance as the rear. Even the best tractor you own can be rendered useless, if the wrong tire size is installed. Width(mm) Aspect Ratio% Inch(Rim) E.g. Jan 9, 2017 #3 Beefman75 said: Might be a bit of a daft question, but if a 4WD tractor has 34" rear wheels, can you just swap them for 38" or do you need to change the front wheels as well? Fronts are 25 x 8.50-14 Rears are 13.6 x 16 with calcium. Use our tyre size calculator to calculate the diameter, width, sidewall, circumference, and revolutions per mile of any tyre. As a rule, please only allow yourself a maximum of 2.5% difference +/-. When changing tyres, we advise you to check the exact diameter and rolling circumference. For each tyre size you input our tyre calculator suggests multiple tyre sizes that are with in one inch bigger and smaller of the entered tyre size. Shop for Agricultural Tyres Online. Menu Home; Tyres by size; Tyre Size Decoder; Contact Us; Blog; Sign In; Home; Tyres by size; Tyre Size Decoder; Contact Us; Blog; Sign In; £0.00 Checkout Search Go. MICHELIN tires, products and services L. What's New. The special dual-angle lug design pro ... Construction. 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. 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 NOTE: Table shows target rolling circumference and should NOT be used to calculate front wheel lead. To use four-wheel drive effectively, the inter-axle ratio must amount to between +1% and +5% (rolling circumference front tyres > rolling circumference rear tyres). Making it as simple as possible to find the tyre that is just right for you. We help you decode your existing tyre size if you're having difficulty working out the size you need - especially if you have an old tyre that doesn't follow the new sizing conventions for crossply or radial tyres. It also includes an explanation of the rolling circumference index (RCI) and speed radius index (SRI). Use the comparison tab to see side by side comparison and speedometer error. You can also run comparisons between different tyres and work out the differences in size and odometer corrections. Find the right tires for your car . 205/45 R17 / R . Lead Lag Calculator With the growing number of mechanical front wheel drive (MFWD) tractors, the rolling circumference of the tires play an important role in determining the correct setup for your tractor. The second number on a metric tyre is to calculate the side wall measurement. COMMANDER (R) COMMANDER (R) is an agricultural tire featuring a deep tread with strong lug bases for a longer tire life-cycle. Skip to secondary content. Spare Wheels; Alloy Wheels; Classic Cars. The first number on a metric tyre is the width. The target rolling circumference for each group is shown below. Below is a chart to convert your bias tire size to a radial size for tractor tires. On Mechanical Front Wheel Drive (MFWD or FWD) tractors, the rear and front tires must maintain a proper rolling circumference ratio. 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