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16 teeth in the front 45 teeth in the rear
The front sprocket has 14 teeth. the rear has 41 teeth, but on mine i have 13 front and 42 rear its more bottom end performance
The chain is size 530, and the stock gearing is 15/45, meaning that the front sprocket has 15 teeth and the rear sprocket has 45 teeth.
on an 2005 trx450r there are 12 teeth on the front sprockeet and 37 in the rear
They came stock with a 49T or 48T rear sprocket you can choose a replacement with either a 48T, 49T, 50T, or 51T, if you have the old sprocket count the teeth on the sprocket and that tells if it is a 48T, 49T or whatever (48T = 48 teeth)
It should be stamped on one of the sides, Or simply count it.
The chainring by the pedals and the sprocket(s) by the rear wheel.
The more teeth you have on the chainring(by the pedals) when compared to the sprocket(on the rear wheel, the more the rear wheel will turn for each turn of the cranks.
with a bigger rear sprocket u will be gearing down. therefor u will have better takeoff but lower top speed.
passenger side of engine.next to the teeth on the crankshaft sprocket facing rear.
For the '06 - 48 teeth in the rear. 13 in the front. For the '07 - 49 rear. 13 front. Not sure about '05 or '08.
passenger side of engine.next to the teeth on the crankshaft sprocket facing rear.