jack.pe

Wondered about this. Obviously 18" will give more grip but then the C4 does not really need it, certainly not in terms of coming out of corners.. so would the extra frictional losses and bigger weight from wider 18" rims still make them a better track proposition Vs 17" on a 964 C4?

BLACK-BETTY

Personally I prefer 18s as you know, less profile = less tyre wobble in bends. As for weight, all depends on the choice of wheel... OZ Alegitas are very popular, weigh little and are decently priced. I personally wouldn't decide on 18s vs 17s based on weight.

I personally found that actually with more meat at the front I reduced understeer (combined with other mods). Overall I found that 225 and 265 works great.

I also found that with a C4 you can afford to be more aggressive with your camber setting due to all wheels being driven. Therefore a wider tyre has more contact patch with lots of negative camber than a skinnier tyre with less negative camber...

£ 1,300 for a set of new track wheels ain't bad,
http://www.design911.co.uk/fu/prod90...-Alloy-Wheels/

clinchy993

Frank is that not £1400 per wheel and tyre ?

freedman

Says per set of 4 Tony

You have to hit the 'more' button to see it

freedman

Also in 17 inch

http://www.larkspeed.com/index.pl?c=...TPK&s=category

breljohn

I was wondering the same thing.
Is there as many tire options in both dimensions?
Also, 18 would allow for bigger brakes if needed...

freedman

Big reds fit fine under 17's, and you're not likely to fit anything bigger than that brakewise

FeralComprehension

Racing, or DE?

I think that given my (lack of) talent I'd appreciate the increased forgiveness that the taller sidewall could afford.

Also, insofar as *my* interest would be DE and not racing, I'd rather the car slid gracefully, so again I think the taller sidewall would win out.

Naturally, YMMV!

breljohn

Brembo GT?

freedman

No idea, never seen them on a 964

Ive not seen anyone running a road legal car use anyting larger than Big reds. Doesnt mean people dont, but if they do its an exception

evanscott964

Jack
Personally I would run the 17's on a narrow bodied car I've always felt the 964 on 18's felt a little over wheeled and not as planted. The key issue is to get some light but strong wheels that's where the improvements are to be gained. The main problem with a C4 is the inherent understeer it has built in always an issue I had when mine was 4WD. I eventually got it all but dialled out which allowed me to corner harder but then I damaged the front power take off unit! Blew the baby apart!
Simon

Earlydays

.......remember Porsche never approved 18" wheels for the non-turbo 964

STUARTQ

Earlydays,
Does that really matter!
We are not talking 991 GT3 and still under warranty.
Did Porsche make an official announcement that you should not use 18" wheels?

BLACK-BETTY

Yup they did. But enough of us run them without issues on and off track... Mind you the Cup cars ran 18s.

jack.pe

Franco, i'm still not convinced on the 18's but thanks for the tip on the Allegeritas, I think that is exactly what I am looking for..they are modernish but don't look terrible, not expensive and I think they will be great on the track..
I'll look into options on 18s too.. but for now swinging towards the 17s. Are track tires cheaper in either size? 18s will be more common i expect..