Join Date: Oct 2004
Location: new egypt, some hick town in new jersey
Bikes: i own a gt ricochet hardtail mtb, a cannondale road, and full suspension mtb, a haro tr 2.1, a diamondback viper that i rebuilt painted and rebuilt with lighter parts, a brand new H&H race group race bike, and a eastern metalhead
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anything with a 45 tooth is stupid in racing. you can get the same ratio by using smaller gears, which in turn, will save weight (the goal in building a race bike). I run a 38-14, its great out of the gate and out of turns... if you track is as fast as you think, try a 38-15 or 40-14. A large sprocket and a small freewheel will give you more high-end speed (top speed) but using a smaller sprocket and a larger freewheel will give you better starts and acceleration. Find a happy medium, probably more towards top speed for longer, fast tracks. and yes a top speed ratio set up will make it harder to pedal, so keep in mind, you need to pedal the whole track. You can't make your ratio too big or it will be too hard to pedal the whole time.
my i suggest buying a couple gears so you can change your set up depending on what track your at.
also, changing the amount of teeth on the freewheel will make more of a difference than changing the sprocket.