Dick and Alpiners,
I have some numbers that will be pretty close for your tires.
These numbers have been tested on the road, and are dead on.
I got the rolling radius data from Yokohama for my 13 60 205
A008RSII tires, which will be close enough for your tires as far as
diameter is concerned.
YOKOA008RSII Rolling diameter= 22.61 inches.
there would be 892 tire revs per mile, and 3470 engine revs per mile.
with 3.89 rear, the RPM per MPH is 57.84
so (at) 60 MPH, the engine turns 3470 RPM.
(at) 100 MPH, the engine turns 5784 RPM.
If you can determine the rolling diameter "Supplied NOT calcutlated",
you can calculate this for all types of tires.
Jarrid Gross
>Has anyone verified these numbers on modern radial tires? I have
trouble
>believing that any radial tire available has the high profile of the
old
>bias-plys found on our cars originally when they were spec'd.
>Just for comparison, with 3.89 gears and low profile 205/60-13 Potenzas
on my
>Series V, I'm turning around 14.75 mph per 1000 rpm's in fourth. I
checked
>the tach out not too long ago and it was relatively accurate.
Verification
>of speed (trust my speedo? HA!) has been by pacing a number of
late-model
>cars at night and comparing the big digital readouts on their dash with
my
>tach.
>
>Dick Sanders
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