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Mixing Tire Sizes

1K views 7 replies 6 participants last post by  Jonathan McCormack 
#1 ·
A friend of mine who races a 911 is changing classes so has offered to give me his old race tyres for my 75

I have these spare alloys



Is it possible to stick 205/50/R15 tyres on the front, 225/50/R15 tyres on the back?

Even if it was possible, would it be a dangerous thing to do? Seeng how tailhappy the car is, I thought it might be a good thing :)

Jonathan
 
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#2 ·
225/50x15 tyres need a rim width of between 6" and 8".

7" is the recommended size - the wider the rim the harder the side wall will be.

If the tyre will fit I don't see any problems with fitting the wider and larger diameter tyres on the back. This can be a problem with cars with ABS so the 75 should be OK.

This should give you less oversteer and most performance RWD cars run wider tyres on the rear.
 
#5 ·
Jonathan, rule with that generally is that you can mix different axles OK, but don't mix on the same.
Who races 911's? Does he do in in Mondello? May know him.
 
#8 ·
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