Tractor tire footprint calculator

LonM

Member
Does anyone know of an online chart or calculator to figure out/compare the footprint of various rear tractor tires at certain pressures (for example 20.8-38 vs 14.9-46, each at 14 psi)? I know one could figure out the overall surface area of each, but the ground contact for each would vary depending on pressure. I've tried to browse michelin, good year and firestone sites without any luck, any help is appreciated!
Thanks, LonM
 
I picked up a DATABOOK volume 15 from Goodyear / Titan, at a trade show a few years back. I use it lots! Bias R-1 Dyna Torque 11 by Good Year shows; @25lbs, Flat Plate Area is 279 sq-in for 18.4-38; 359 sq-in for 20.8-42. Extensive charts for all types and sizes.
 

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