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Re: Off-diameter tires
On 6 Dec 95 at 21:49, Brooks Ellis wrote:
> I'll just go ahead and stick 205 vr (sr zr whatever) 50 15 boys on them
> wheels.
> Would this 'screw things up BADD'? Could I get my spedometer
> recalibrated for the smaller tires for a low cost? would it $#%^ up my
> ABS/whatever else uses tire size to function?
>
One of the tire companies (I forgot which one) has a web site (I
think it's Goodyear) that'll help you figure out what different tire
sizes will fit on a given size rim (15 X 6 in your example), and
tells you the overall diameter of the tire. This info would probably
help you out a lot. I don't know what diameter you're shooting for,
but on 6" wide rims you could probably fit 215, or maybe even
225/50R15 tires, which would give you a larger tire contact patch,
and a larger overall diameter that I suspect would be closer to what
you have now. When you change the tire diameter (outer diameter, not
inside diameter) it not only changes the speedometer calibration, it
also changes the RPM range your engine works in. A car that turns
2000 RPM at 60 MPH might spin at 3000 RPM at 60 MPH with a smaller
diameter tire. I don't know what's involved in recalibrating an
Audi speedometer, though.
Hopefully, someone else can get you the URL for the Web site I
mentioned...
-Rich
'85 Audi 5ks
'85 El Camino
'72 Suzuki GT380 w/ front disk retrofit
'73 Suzuki GT550 in pieces
member Teamsters local 486