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 - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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