R1100 speedo error

[phoenixtexas]

The speedometer error questions appearing here can be explained by the low-profile rear tire, which has a smaller outer diameter than a conventional tread. The speedo error works out to about 8 percent, which would fit with the reduced outer diameter. The differential ratio (typically 33:11) hasn't been changed, and the speedo runs off the front tire at a slightly different rate. Put oversize rear wheels on a car or truck and see what happens to the speedo, it's more pronounced. Trying to be helpful.

[Mr. Frank]

The size of the rear tire is not going to affect speedometer error on a bike which takes the read off the front wheel. It will affect the relationship between the tach and the speedo.

[JimVonBaden1]

Originally posted by Mr. Frank
The size of the rear tire is not going to affect speedometer error on a bike which takes the read off the front wheel. It will affect the relationship between the tach and the speedo.

Correct!

Jim:brow