Lawrie,
The circumference of the original Dunlop 550x15 on the car was 83.90
inches / pi would make the diameter about 26.71. Interesting that the
550 was smaller in diameter than the 600.
Wish I had investigated the Dunlop SP20A/S before putting the
Firestones on. They were probably average tires in their day, but the
average tire of today achieve a much higher standard on every measure.
BOb
On Fri, 3 Nov 2000 08:55:22 -0800 "British Sportscar Center"
<Lawrie@britcars.com> writes:
> Bob.....
>
> The TF on which I have fitted the Dunlop SP20 A/S radials was
> previously
> fitted with Dunlop Gold Seal 600 - 15 bias ply tires. The diameter
> of the
> mounted Gold Seals was 25.5". The new Dunlops measure 25.3". I doubt
> this
> small a difference will affect the gearing or speedometer reading to
> any
> great extent.
>
> Lawrie
> British Sportscar Center
>
> -----Original Message-----
>
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