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gearing help needed

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just picked a oo xr 400 w a new 16 tooth front sprocket and 48 tooth rear sprocket shoul i be at 14 and 46 or is this the right way to go want a top speed of about 80 i think. thanks

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Stock gearing is 15/45. With the 16/48 gearing is the same at 3:1.

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You want 80mph sustained or just want to be able to hit it? I think either way, I'd drop the rear sprocket back to 45. 14/46 will give it lower gearing than what you have now and make it harder to hit that kind of speed.

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no 80 if needed not sustained thanks i thought my math was right but wasn't sure. not sure why he went with 16-48 unless he was looking for some adjustability out of the front sprocket.

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I have 14/46 gearing and can just hit 70mph. I would think 16/45 would be close to what your after.

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