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Speedometer Accuracy

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.


2002 R1150r
1975 R90/6
ABC# 8111
BMWMOA # 117910
San Francisco, CA