So the other day it was only 10* below freezing, so I figured I'd put the madstad on and go for a ride. Tooling along down the freeway on the way home (breakfast burritos don't stay warm long at those temps, had to get them home) and it occurred to me that I was in third gear. Long story short, I think I'll really enjoy it more if I go with the xb9 primary gearing. But since so far my bike came with nearly every option and upgrade, I want to make sure it doesn't already have it installed without having to pull the cover off. Does anyone have a good accurate rpm@mph (gps) figure for stock and/or the xb9 gearing?
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Rpm@mph?
- Thread starter whodat
- Start date
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user_deleted
Well-known member
the XB9 gearing is 10% lower than the XB12 gearing. speeds below are approximates in top/5th gear with stock belt pulleys and stock aspect ratio tires:
XB9: 100mph @ approx. 5400rpm
XB9: 70mph @ approx. 3900rpm
XB12: 100mph @ approx. 4800rpm
XB12: 70mph @ approx. 3500rpm.
contrary to popular thought the higher rpms for street cruising on a 9 harm nothing. 9 stroke considerably shorter than 12 stroke which results in less piston foot-speed per mile.
