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Lawnmower Tire Question

S

slim

Member
I need a little more clearance cutting late summer with my JD 175. Right now it has 18x8.50x8 rear tires. If I replace them with 20x10x8 will I get an additional 1 inch of clearance? The bigger tires should fit since the JD parts book lists them as the correct size tire for a 46 inch deck. I have a 38 inch deck on my 175.

Thanks

slim
 
No, you might gain 1/2" at the most, then you will have to raise the front of your deck also or it will give a poor quality of cut.
Ji
 
Most of the height adjustment is in the front of the deck. I've raised it as high as it will go and it seems to slope to the rear. That's why I thought of the bigger tires. I already have the tires since I bought them for a different mower, just haven't used them yet.

slim
 
Slim: the front of your deck should be 1/4 inch
lower then the back. Then use the lever that raise
your deck to get your height of cut you want
 
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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