Thanks roysheepdog that's good info-My front sprocket is 16 tooth (also have a 15 tooth spare) and I called the guy I sold the frames to double check- he measured the rear tire and counted the rear sprockets again for me (1 had a 38 tooth & the other had a 45 tooth), the actual stock rear tire height was 24". I'm still in the ballpark with the ratio I'm trying first (16 45=2.82 or 15 45=3.00)for good torque and PLENTY of top end (70-80mph+)
It's amazing how the ratio's work on different machines - my "different type of buggy" has 13 40 and the trx200sx motor only turns about 6,000rpm's and it'll boil the tires in 1st- I just leave it in 3rd gear for general driving and only rarely get into 2nd if I'm climbing long hills (22" tires)
We'll see how it plays out when I make the maiden test run!!!!
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