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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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