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Re: FIA Tyre sizes

Posted: Sat Mar 09, 2019 1:48 pm
by nikbj68
My FiA has MGB front & Jag rear.
I was fortunate to be offered a new but surplus set of CR6ZZ’s at a bargain price, 225/65 front, 275/55 rear.
To be honest, if I’d been choosing the size, it would have been 225/60 & 295/50, the n/s front 225/65 has made contact with the arch at full compression, and I think the 295 would fill the rear arch better!
I’m running 22psi front, 24 rear, but on long journeys run 28-30 all round.

Car came with Cooper Cobras. Horrible.
I ran Dunlop Racing 5.50x15 front, 6.50/15 rear, OMG they look great but are terribly twitchy on anything less than circuit-smooth roads.

Re: FIA Tyre sizes

Posted: Sat Mar 09, 2019 2:46 pm
by peterc
Nik.
I assume you are on 7.5” and 9.5” width rims as putting 275’s on 8.5” would be a over done?
Peter C

Re: FIA Tyre sizes

Posted: Sat Mar 09, 2019 5:31 pm
by nikbj68
According to Avon you could go up to 295 on an 8.5” rim.
But yes, 7.5/9.5. 👍🏻

Re: FIA Tyre sizes

Posted: Sat Mar 09, 2019 6:51 pm
by peterpjb
original spec is front 6,5“ with 215 and rear 8,5“ with 245,
thats also current FIA spec