Always put the new on the front. A large difference in diameter will increase the wear and tear on the drive-line and tires but it isnt the end of the world. The reality is that the working diameter of the tire (which is calculated from the center of the axle to the ground) changes with the loading thus even when all four tires are new the fronts get smaller and the rears get bigger when you put a load in the bucket. Bottom line is keeping them close to the same is good but two different sizes isnt going to kill the machine.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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