I have been a bit skeptical about the 15/17 gear set up. With my engine, I tried a 23% overdrive. Too high. The 15/17 works just fine with a 13 tooth pinion and my setup. I can pull in 3rd gear on most tracks and 2nd on sticky tracks.
Bought some of the new Lawntechs from Midwest. They are 81.5 inches around so they fit under the fenders without mods. They beat a set of super lugs by almost 50 feet. Had a good day pulling.
Got a look today. The Lawntechs rubbed on the inside of the fender and the edge of the fender under load. Moved the fenders up an inch. Going to add another 1/4"to the wheel spacers.
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