Q: What are the stock sprocet sizes for my bike?
A: Stock sprocket sizes are as follows:
BIKE FRONT REAR PITCH
87 - 90 600 F 15 44 530
91 - 96 600 F2/F3 15 43 530
97 - 98 600 F3 15 43 525
99 - 00 600 F4 16 45 525
01 - 05 600 F4i 16 46 525
03 - 05 600 RR 16 43 525
93 - 95 900 RR 16 43 530
96 - 99 900 RR 16 43 525
00 - 03 929/954 RR 16 43 530
87 - 88 1000 F 17 43 530
90 - 96 1000 F 17 42 530
04 - 05 1000 RR 16 41 530
97 - 03 1100 XX 17 45 530
Q: What is pitch ?
A: Pitch actually deals with chains (e.g. how wide the rollers are). But its important to sprockets because the pitch of the sprockets MUST match the pitch of the chain. In a practical sense, the lower the number, the lighter the sprocket is but less strength. The higher numbers will be stronger but heavier. Many riders do a 520 conversion to save weight.
Q: Can I change sprocket sizes? What does this do? What size should I change to?
A: Yes, you can change sprocket sizes. Often people do such to shift the torque curve and gain more usable power. There is no ideal answer as to which sizes to use. It will depend on what you're trying to achieve (e.g. more low-end acceleration, optimal track conditions, stunta from hell, etc). Here is a great article from Sport Rider that discusses sprockets and will help make an informed decision on determining what gearing you need. But note that changing sprocket sizes will affect speedo error and gas mileage.
Q: Changing sprockets will also affect my speedo but by how much?
A: The math is actually quite simple:
Let ratio = (# teeth of front sprocket) / (# teeth of rear sprocket)
speedo error % = ( (old ratio - new ratio) / new ratio * 100) + stock speedo error%
Q: Should I get steel or aluminum sprockets?
A: This only applies to rear sprockets (front sprockets are always steel because of their size). The answer will depend on your riding needs. Aluminum sprockets are lighter but not as strong as steel. Racers will use aluminum sprockets for weight savings while commuters and stunters will generally want steel for longevity and strength.
Q: Do I need to change sprockets when I change my chain (and vice versa)?
A: Generally, you want to change your chain and sprockets together. A worn chain with new sprockets will wear the new sprockets faster and vice versa.
 badfish'05 600RR Purple/Black |  |