Replacing one tire on a driven axle
When a single tire on a loader or a four-wheel-drive machine is damaged beyond repair, the natural move is to replace that one tire. On a driven axle, that can create a new problem.
A new tire is taller than a worn one. On a machine where the wheels are driven together, a tall tire and a short tire on the same axle, or front and rear tires of different rolling diameter, are trying to cover different distances with every turn. The drivetrain absorbs the difference. Over time that can mean extra wear on differentials and axles, scrubbing of the tires, and on some machines heat in components that were not designed to carry that load.
What to do about it
Measure before deciding. Compare the tread depth or rolling circumference of the new tire with the one beside it. A small difference may be within what the machine maker allows. A large one is not.
Replace in pairs where the difference is large. Two new tires on one axle, with the better of the old tires kept as a spare, is often the sensible answer.
Use a part-worn match. A sound used tire of similar wear is sometimes a closer match than a new one.
Check the machine maker's guidance. It usually states how much difference in rolling diameter is acceptable.
The store can measure what is on the machine and say which approach fits. On an expensive tire, that conversation is worth having before the order.
Other OTR work
Damaged tires are assessed for repair before replacement. Rims can go to wheel refurbishing, and sound casings can go into Purcell's retreading program. The national OTR services page covers fitting, repair and supply. For a managed mining program, Tucson runs mining fleet services.
Other OTR stores nearby
Tucson and Casa Grande also offer OTR services.
About this store
The Willcox store carries all nine Purcell tire categories, including agricultural tires and tracks, and is managed by Mark Laster.
See the national OTR services page for all 41 locations.