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Re: Speedometer Accuracy
- Subject: Re: Speedometer Accuracy
- From: andrew johnson <sundiaL@xxxxxxx>
- Date: Wed, 1 Jun 2005 09:05:18 -0700
At 8:32 AM -0700 6/1/05, Gregory Appling wrote:
>The bike in question: 2002 R1150r
>Does anyone know how accurate the speedometers for the R1150r's are?
>I'm currently trying to figure out if my speedometer is way off or
>if my GPS units is just so cheap that it's not even close.
>Yesterday while running down the highway my speedometer read 92mph,
>my GPS read 81.7mph and my girlfriends SUV (following closely) was
>somewhere around 85mph.
>Just wondering if this is normal or time to take it in to be checked
>(still under warranty).
>Thanks for any help.
>BMWMOA # 117910
>San Francisco, CA
It's probably off, reading from 5% - 8% high (fast). BMW does this so
you can't claim you were traveling faster than your speedo indicated
(they don't want to be held liable for your speeding tickets).
A common fix for the GS 1100/1150 is to take a speedo hub from a
spoked R1100R wheel and get accuracy within 1%. The R1100R hub for
spoked wheels has a different ratio that almost perfectly solves the
problem for the GS.
Other solutions for cable-driven speedometers use ratio-changing gear
boxes to correct for the variation.
- - andrew, Berkeley, '00 R1150GS
- - "Moto per Mangiare, Mangiare per Moto"