tire size differences

[Marc Sims]

Re below;-

Tell me about it I made the mistake of trying to gradually move from a 50mm
profile to a 45mm, I thought that If I did the front first and then the
rears a month later when I had the cash It would be OK, BIG mistake, the car
was crabbing and jumping along the 500yds of road back to my house.  I had
to spin the car round and get the remaining two tryes done before my diffs
went bye bye.  Other than that actual tyre wear is almost non existent,
average 14k on a set, my old coupe q manged 16k on one set and trust me I
wasn't the sort of driver to go easy on them.  This is compared to the nasty
Vauxhall Calibra 4x4 that got about 4k out of a set (permanently locked
diffs, i think).

Marc S

>the problem with running different sized tires on an all-wheel drive
>vehicle (like an quattro) is that your expensive gizmos that sort out
>the torque to the various wheels get really confused by the variances in
>rotational rates at each wheel. then those components tend to quit
>working and/or self destruct. the only way to insure that the tires are
>all the same size is to run the same brand and model tire at each wheel.
>although the sizes themselves are standardized, the diameters of
>different manufacturers tires can vary within certain parameters, and
>this variation can be fatal to the aforementioned components. i hate to
>be the bearer of bad tidings regarding this sort of failure to a
>customer, but then again, it's not my car, and i didn't do it to it. i
>will fix it, though, and it is not cheap. the tire education is included
>at no extra charge. marc

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