[Mg-mmm] Spoke Replacement and Wheel Truing

[Chris Bucknell]

Thanks to all.

I will get below 30 thou and try for 10 (you have set me a challenge Pete).

Chris

-----Original Message-----
From: BOB GRUNAU [mailto:grunau.garage at sympatico.ca] 
Sent: Saturday, 13 February 2010 11:34 PM
To: Clive Sherriff; Chris Bucknell; MMM List
Subject: RE: [Mg-mmm] Spoke Replacement and Wheel Truing

Hi Chris,
I agree with Clive. New modern wire wheels have a maximum tolerance of 1.5
mm ( 0.060" ) in wobble and bounce. Most are manufactured to about 0.030"
wobble and bounce.   I think on a race car you should aim to be below those
maximum limits.
I have had 15" wheels on  3000 Healey that were 0.125" wobble and they
worked fine on a road car after proper balancing.  Probably not good enough
for a race car.
Try to get 0.050" or less on wobble.
Just as important is a proper wheel balance. I use an old static balancer
and find this works well for street wheels and race wheels. Better in fact
than most dynamic balanced wheels  that are not held properly in the balance
machine owned by the local corner garage.
Bob Grunau
Canada


50 thou (about 1/16 inch) for the "out of round"
seems just about OK, but the 130 thou (1/8 inch),
if thats the best you can get,  seems to me to
indicate that the original rim is distorted somehow.

Why 15 inch rims, they are not VSCC eligible for
a pre war MG?

Clive


> Hi All,
> Not getting a lot of help out of the forum in England so far so I thought
 I  would try you guys.
 I am respoking some 15 inch race wheels for our pre-war Racer.  I want to
 know what the out of round tolerance should be and the axial wobble
 tolerance.  Hopefully everyone can work out what I am talking about.
 I have a hub mounted on a jig and am able to measure the out of round and
 the axial wobble  by a dial gauge.
 I have gotten down to 50 thou for the out of round and 130 thou for the
 axial wobble.  At what point is enough enough?
 Chris

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