Diffrence on 14" Compagnolo wheels?

Hi!

While restoring my car I took out the spare tyre as well as the wheels that was on the car for restoring. While lifting of the 4 wheels on the car i thought they where extremely light. But the spare tyre seemed almost twice as havy!

Did compagnolo deliver the 308 rims in both magnesium and alu? and was the spare standard as aluminium?

The car in question is a 1977 308 GTB

Best Regards
Kjerand

 

are they the same tyre?

 

Its not the same tyre on the five rims, the spare has the original Michellin XWX tyre on. But the 4 others has a bf goodridge tyres. Do you think the massive weight diffrence lays in the tyre alone?

 

I have seen some sets of 14" wheels where one casting was labeled for spare use, but I don't know answer to your question!

Get the tires off for the real answer

 

I can't see any label "for spare use only" or any rust, so its possible the only diffrence is in the tire, but I'll update the thread as progress proceeds on restoration of the wheels ;-)



As you can see in the photo the spare wheel is intact with the original painted writing on the rim


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I can't see any label "for spare use only" or any rust, so its possible the only diffrence is in the tire, but I'll update the thread as progress proceeds on restoration of the wheels ;-)




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I would expect the XWX tires would be dramtically different in weight to a modern tire. the Michelin XWX will have a totally differnt carcase structure, which is part of the reason the car will handle so much better on that XWX tires.