salsa1
Needs a life
Posts: 5971
|
posted August 28, 2006 07:21 AM
 Edited By: salsa1 on 28 Aug 2006 08:23
Rear sprocket change question
Does changing the rear sprocket affect accuracy of you speedometer reading?
Have speedo healer and set correct before change... I now have changed rear ro sprocket three tooth larger....
I know tire size change can change speedometer reading but not sure about effects of rear sprocket...
anyone know... seems like a trick question to me...I am guessing it does not....but as a good engineer I am complicating the issue in my head...hehe..
Is the ZX-10R picking from the front tire to read from.. if so then no effect ..
can check later I suppose...
____________
Salsa1
  
|
GUNNER
Needs a life
Posts: 5778
|
posted August 28, 2006 07:39 AM
Dude ANY gear change will make the speedo OFF!
|
bovinespongiformencephalo
Pro
variant Kreutzfeldt-Jakob
Posts: 1060
|
posted August 28, 2006 08:13 AM
Salsa, the speedo is triggered by the rotation of the countershaft. That's the thing you bolt the front sprocket to. Like gunner said, any change in gearing, front or rear (or a tire size change, fluctuations in the earth's magnetosphere, your wife's mood...), will change the relationship between the rotation of the countershaft and the rotation of the rear tire rear tire. So yes, you will need to recalibrate. You can do it mathematically if you don't have means to get an accurate fix on your speed. Just add the percentage by which you changed the rear sprocket to your existing correction factor.
|
salsa1
Needs a life
Posts: 5971
|
posted August 28, 2006 08:22 AM
Edited By: salsa1 on 28 Aug 2006 09:25
"Salsa, the speedo is triggered by the rotation of the countershaft."
Cool beans... thats what I inititially thought ...remember taking the sensor off along with front sprocket cover and experiencing a loss of mph reading while in the process of having my front sprocket broken loose by local mechanic...
I noticed my mph in first gear did not change after adding 3 teeth at rear yesterday... well wanted to ask..
btw : my wifes mood can change a whole lot of stuff......been there done that...haha!
Thanks...
____________
Salsa1
|
bovinespongiformencephalo
Pro
variant Kreutzfeldt-Jakob
Posts: 1060
|
posted August 28, 2006 08:26 AM
Just divide the number of teeth on the back sprocket by the number of teeth on the front spocket, first with the old rear and then again with the new. The difference between those two numbers, added to your existing correction factor, should account for the new rear sprocket.
|
salsa1
Needs a life
Posts: 5971
|
posted August 29, 2006 05:12 AM
Thanks Bov..just dividing old rear # of teeth by new rear # gives percent change.. front sprocket stays same so no need to include in calculation ...
bike pulls with more authority.. aluminum rear sprocket also weighs much less.. feels like at least 2 ponds less weight to move...look forward to the track this weekend...
____________
Salsa1
|
bovinespongiformencephalo
Pro
variant Kreutzfeldt-Jakob
Posts: 1060
|
posted August 29, 2006 06:47 AM
Fine, make it easy. I try to throw in a few steps to complicate it and make it fun, and it just goes unappreciated.
|
|
|
HOME
NEW TOPIC