Re: wheels/tires for Coupe GT

[Allan Jones <ampj@tiac.net>]

>         One more thing, the affect of running 195/60s instead of stock tires on
> my digital speedo. I believe my speedo now shows a slower or smaller #.
> The tire is not turning as many times to achieve the same speed. So if I
> have seen 126 MPH, assuming the instrument was perfectly calibrated of
> course, then I was actually going faster, right? I can and will try to
> figure the true speed out(in a perfect world, i.e. 126 on 195/60 tires
> with no other factors) but want to know if a lister also can so I have a
> reference answer.

	I figured, asumming I was in a perfect world(speedo perfectly
calibrated, tires perfectly inflated with full tread, etc.), that when
my digital speedometer read 126 MPH running on 195/60 tires instead of
the stock 185/60 size for which the speedo is calibrated, I was
traveling at 128.6 MPH, optimistically 129 MPH in an '86 CGT!....not
bad! Now if that is right and I ditch my cat, I'll be zoomin'!!
	OTOH, I am prolly going to switch to 195/55 "V" or "Z" rated tires this
spring for what I expect to be a great increase in performance, but this
switch has its downside too. Something that I feel is essential to my
daily back-road driving: top speed. Yes, top speed will suffer greatly,
as I calculated a speed of 124.379 or only 124 MPH. :( Now the cat MUST
come off....
					;) ;) ;) Allan
p.s. I hope my calculations are right.