Re: Speedo error

["John A. Virnig" <john@xxxxxxxxxxxxxxx>]

> I asked the dealer about the speedometer; it's not off by much. 70
indicated
 > is 70.4 actual, but I'd like to get it right if I can.

BMW's are notorious (cars & bikes alike) for a 5-8% error in the speedo
reading.  All you've done is reduce that by increading your tire
size.....and effectively your gear ratio.  By changing to the 245/40-17 from
the 225/50-16 the circumfrence of your tires are .57% less than stock which
is enough to make up that kind of a difference.

Do the math.....or send me a private email and I'll send you my Tire & Wheel
size guide (Excel spreadsheet).

John
'97 328is

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