Re: Info on matching front to rear tires on FWA tr

Posted by Wardner on September 17, 2006 at 10:56:04 from (4.154.240.15):

In Reply to: Info on matching front to rear tires on FWA tracto posted by DAN9-Midwest on September 17, 2006 at 06:24:09:

You seem to key on "rolling circumference". I think that builds in an error right away. You should be doing the calculations with "loaded radius". Multiply that by 2 and again by 3.14 to get "true rolling circumference" for the situation. Of course, you don't need to do the additional math. Develop the ratios based on the distance the centerline of the axles are above the ground. A large rear tractor tire at 8 lbs could have a 2-3" shorter radius than one inflated to 20 lbs. That will effect revolutions per mile. The tire mfgs have no control over inflation pressures and weight so they have to use rolling circumferance based on unknown user set-ups.

I always get a kick out of 4x4 backhoes and some of the Kubotas around here. The front tires always wear quicker than the rears particularly when the owners don't bother to disengage the front axle when it is not needed. There is a tremendous amount scuffing in turns. I ask them why they want to stress the drive train and increase tire wear. They don't know what I am talking about.

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