Are you talking about what brand or number of teeth? Anyway, we need more info like what type of riding. Trails, MX/SX?? Also, where can I get a YZ1256? That thing must fly..... LOL ;)
a yz1256 eh? haha umm what are you looking for more low-end or top-end speed? for more low-end go 1-2 teeth bigger up on the rear sprocket for top-speed go 1-2 down on the rear sprocket
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