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Do NOT drag race with a 63 tooth sprocket. The car will hand you your *** while you try not to flip over from the initial wheelie.
I agree with that 100%. I'm one tooth down on the front sprocket, stock rear sprocket. If I didn't daily drive my bike, I MIGHT do +1 or +2 on the rear, but a 63 is a stunt gear, period. He WILL hand you your *** if you try to run that gear.