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Speedo off

873 Views 8 Replies 6 Participants Last post by  bluebee
My speedo is off by 5 MPH. Its showing faster then I'm really going.

I have the BBS BMW 17" wheels. I also have 235/45/17 Toyota porxis

Is this normal

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I am running the OE wheels and mine has always been like that. I just do a bit of math when ever I see a cop lol
I've been using the GPS on my phone to check. I speed through Montana on my way to North Dakota

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The BMW spec allows for a reading as much as +10% of actual, +2.4 MPH, never less than actual.

This is called "spedometer advance," and ensures that the speedo never reads less than actual speed.

Mine is off by 5 MPH at an indicated 80.
Speedo reads 85. Actual 80

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Most if not all German cars do this.
Come to think of it my last couple Mercs did it as well.

Maybe they are trying to keep people from getting speeding tickets.

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See also:
- BMW speedometer reads higher than actual speed (E39) (E90) (X5) (6-series) (MINI)
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