Tyres

[audi321]

Hi all, I'm in need of some rear tyres for the 996 C4S. Standard are 295/30/18. I can get some part worn of my mate which are 285/30/18 N4.

Will they work? Any problems?

Cheers.

[gerradiuk]

Think it could as the rolling radius is different & the 4 wheel system might not like it. Part worn tyre's ....Mmmmm not on a high performance car.

[audi321]

When I say part worn, they must be about a month old! Still got 6-7mm on. Cheers for advice

[911p]

gerradiuk said:

Think it could as the rolling radius is different & the 4 wheel system might not like it. Part worn tyre's ....Mmmmm not on a high performance car.

Rolling radius is the same, 30/18. I think they'd be OK, but I'm sure some people more experienced in this field will chime in soon.

[Callughan]

its fine, but new 295 would be better

[clockworks]

Wouldn't a 285/30/18 have a smaller radius than a 295/30/18?

The aspect ratio (30 in this case) denotes the sidewall height as a percentage of the width (285 or 295). Maybe not enough of a difference to cause a problem.

[Angelus]

clockworks said:

Wouldn't a 285/30/18 have a smaller radius than a 295/30/18?

The aspect ratio (30 in this case) denotes the side wall height as a percentage of the width (285 or 295).

Yes.

[Magic919]

The difference should be about 3mm, but tyres vary across brands and types.

[audi321]

So with new tread at 8mm and worn tyres down to 2mm (i.e. 6mm variation) the 3mm difference I will experience from putting these on won't make any difference?