Quote:
Originally Posted by Fifty150hs
What I noticed between used (very) tires and new and the gps speed vs the displayed speed was no difference. At 80 mph (gps), the speedo consistently reads 82/83 mph.
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Interesting - I would expect to see a 3-4% variation over the life of the tyre. That's what I see on my bike and the X5 calculates speed in the same way - via the ABS sensors...
I guess it's possible there is a correction factor built in to allow for the tyre wear but that would require the original tyre size to be known... too complex, even for BMW.