[rescue] SLACKERS
Julius Sridhar
vance at ikickass.org
Tue Jan 22 22:56:48 CST 2002
On Tue, 22 Jan 2002, Dave McGuire wrote:
> > Do larger tires affect the accuracy of the speedometer? If not, how
> > does the speedometer on most cars determine speed? It would make most
> > sense to me to have it judge the RPM of the axle, and determine speed
> > from that, but, if the circumference of the wheel changed, the
> > speedometer would be inaccurate. So, do you have to adjust the
> > speedometer if you put on larger tires, does the speedometer gague speed
> > a different way, or is the change in circumference of the tire not
> > usually big enough to make a difference?
>
> Most speedometers are driven by a take-off in the vehicle's
> transmission. Changing the size of the tires does indeed affect their
> accuracy, by enough of a percentage to make one want to get it
> recalibrated.
What I usually do is that I get a tire which won't have a different outer
diameter from the original, but I get shorter sidewalls and bigger wheels.
Peace... Sridhar
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