Tools Required: 36mm sprocket, breaker bar (or impact wrench), torque wrench
If doing rear sprocket as well, do it now.
1999 - 18 / 43
2000 and up - 19 / 43
18/43 gives good acceleration in 1st and 2nd, yet gives a low motor speed when cruising (under 5k @80). 17/43 will give better acceleration in 1st and 2nd, yet will make your top end looking for shift for highway use. 19/43 will give you great touring speeds, but may leave you looking for more on the low side.
A purely theoretical examination of the performance would suggest the following statistics. The variance in the acceleration times occurs when a gear change occurs at the top of the acceleration window (i.e. 60 or 100).
Front | Back | Ratio | 0-60 | 0-100 | top |
---|---|---|---|---|---|
19 | 43 | 2.26 | 4.06 | 8.45 | 166* |
19 | 45 | 2.37 | 3.61 | 8.44 | 158* |
18 | 43 | 2.39 | 3.59 | 8.41 | 157 |
18 | 45 | 2.50 | 3.66 | 8.23 | 150 |
17 | 43 | 2.53 | 3.64 | 8.20 | 149 |
17 | 45 | 2.65 | 3.54 | 8.27 | 142 |
* Speed at max revs. Wind resistance limits actual max to ca. 157 mph.
Thanks to Keith Tynan for information