Re: TA600: 17 inch rear to 18 inch. Effects?
Bigger wheel = move distance per engine rev, extra 3.14" on an original 53.38", so + 5.9%.
Larger rear sprocket would reduce this, on a std 48 tooth, each tooth is worth just over 2%, same effect as smaller front, but on a std 15 tooth, each tooth is worth 6.7%
The % work either way, so larger front is +6.7%, just more than a larger wheel.
I'd think, as an 18" wheel is a "tyre choice" move, I'd run a 14t front with a 50t rear, giving an approx 5% down gearing effect, and the choice of full on enduro tyres! (Chain should be ok, as overall just +1 tooth in system.)
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