"Dave Plowman (News)" Wrote in message:
In article ,
Jim K.. wrote:
Still hopefully the same external diameter, otherwise the car would (try to)
go round in circles.



We call them differentials...

Good luck running different sized tyres on the driven axle. The
differential will over-heat and fail.


Good to know your cars are so old they don't have space savers.
--
Jim K


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