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1466 Views 7 Replies 5 Participants Last post by  brianmdavis
I have a 06 999S and I want to order a new chain and sprockets this weekend. The gearing seems to be alittle tall plus I don't think the bike would pull redline in 6th gear anyway,and I don't plan to on the street. In the mountains it seems like you are in 1st, 2nd, or 3rd gears alot,so I wanted to go up in the rear to a 38 or 39. I don't think I'll lose much topend anyway,so what works best a 38 or 39?? Thanks
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39. You'll have a theoretical top speed of 160mph at 10k rpm, based soley on the ratios. With the 38, you get 165 @ 10k.

For comparison, the stock 15/36 combo has a theoretical speed of 174.
I should add, that these number aren't taking into account wind resistance. You could very well hit an aerodynamic brick wall at 150 in any of those combos.
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