sprockets?
#10
04-05-2010 | 10:43 AM
OK, hang on.
First off, what are you changing your sprockets TO? If you're keeping the stock tooth count, then you will have no issues, carry on as normal.
If you're changing the tooth count, then YES, your speedometer AND ODOMETER will be off. YES, this means your odometer will no longer report the correct milage for your bike (if it thinks you're going 70 miles per hour, but you're really going 60, it's going to add 70 miles per hour to your bike's milage, instead of 60. Really sucks trying to explain that when selling the bike).
How much it will be off by varies based on what the new sprocket ratio is, so we can't answer that just yet. It will, however be a percentage, not a hard# (like your buddy's mystery R1 up there). If he did a -1/+2 (most common) then he's most likely off by 10MPH @ 100MPH, 5MPH @ 50MPH, etc. If he's off y 10MPH @ 50MPH, then he most likely installed a hug "pizza sprocket" in the rear. Being off by a set amount all the way through the range means he broke his speedo, or his bike is magic, and can defy physics and algebra.
If your bike is an 06 or earlier, you can buy an inline speedohealer:
http://www.speedohealer.com/eng/order.htm
This will correct ALL of that. If it's an 07 or newer, you have to buy the one that connects to the front wheel, and measures the speed mechanically from there. Huge PITA, but it works.
As always, MAKE SURE YOU RPELACE BOTH SPROCKETS AND CHAIN AS A SET. DO not mix and match old with new.
First off, what are you changing your sprockets TO? If you're keeping the stock tooth count, then you will have no issues, carry on as normal.
If you're changing the tooth count, then YES, your speedometer AND ODOMETER will be off. YES, this means your odometer will no longer report the correct milage for your bike (if it thinks you're going 70 miles per hour, but you're really going 60, it's going to add 70 miles per hour to your bike's milage, instead of 60. Really sucks trying to explain that when selling the bike).
How much it will be off by varies based on what the new sprocket ratio is, so we can't answer that just yet. It will, however be a percentage, not a hard# (like your buddy's mystery R1 up there). If he did a -1/+2 (most common) then he's most likely off by 10MPH @ 100MPH, 5MPH @ 50MPH, etc. If he's off y 10MPH @ 50MPH, then he most likely installed a hug "pizza sprocket" in the rear. Being off by a set amount all the way through the range means he broke his speedo, or his bike is magic, and can defy physics and algebra.
If your bike is an 06 or earlier, you can buy an inline speedohealer:
http://www.speedohealer.com/eng/order.htm
This will correct ALL of that. If it's an 07 or newer, you have to buy the one that connects to the front wheel, and measures the speed mechanically from there. Huge PITA, but it works.
As always, MAKE SURE YOU RPELACE BOTH SPROCKETS AND CHAIN AS A SET. DO not mix and match old with new.