Of course it will raise the back of your mower by approximately 1". Tire size is read by the diameter of the tire, then the width of the tire, and then the diameter of the rim. You said you wanted to change an 18-8.50x8 for a 20-10x8. This means that the diameter changes by 2" which will translate into a radiius change of 1" (the distance from the center of the axle to the outside of the tire). This should give you exactly the 1" height change you aare looking for. For what its worth, my JD tractor tells me to have the blade 1/2" higher at the front than the rear. This has to be measured on a flat surface like a garage floor. Remember that it is the blade, not the deck pan that you have to measure. I hope this helps a little.
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Today's Featured Article - Restoration Story: 1929 McCormick-Deering 10-20 - by Randal Simmon. On July 4th 1998 my dad and I was sitting on the front porch when he said that he was going to sell his two 10-20's to a junk man. He said that the junk man was going to give him $500 for both of them but he hadn't received the money for them yet. So I went into the house and wrote him a check for $500 and bought them myself and said now they are mine. He had bought them about five years before thinking that he was going to restore them himself. After five years sitting in the barn, he changed h
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