In a message dated 6/16/00 7:29:11 PM EST, randallyoung@earthlink.net writes:
> Oops !
> In re-reading my previous reply, I see that I've used 'rpm' to mean
> revolutions per mile, instead of the more customary revolutions per minute.
>
> To get the conversion factor between your tach reading (rpm in hundreds)
> and miles per hour....
Actually, it's probably easier yet just to look in almost any book on
Triumphs to find that an "original" (original size tires, non-OD 3.7:1 diff.
ratio, etc.) TR4 would yield around 20 mph per 1000 rpm in top gear, or about
25+ mph for OD top and the optional 4.1:1 diff. Given the accuracy of a
38-year-old tach along with tires probably a slightly different size than the
original, I suspect that this rule of thumb is close enough for anything
except a solid defense in traffic court. ;-)
--Andy Mace
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