BigBagBen

up front to reduce the amount of plow my car (02 TT) has when I push her hard into corners and on reducing radius corners.

I had the same issue with my supercharged 540 which I ended up putting 275 35 18's up front (same all round) and it made the car really neutral with no plow at all.

Yes I know I could slow down....that's not going to happen unless I end up in the bushes....lol

I have the stock P Zero's on there at the moment.

My thoughts are swapping them out to Michelin PS2's with
275 35 18's up front and 315 30 18's out back or larger?

I also know that I will get significantly more tramlining with 275's up front...that does not bother me.

Does anybody know if you have to roll the fender to fit this rubber on....again not an issue as a bought a professional fender roller for my Beemer to do the rears.

Thanks for your help chaps.

Ben

Gilhart 54

Ben,

I've heard that 275's will fit up front and that the fender's must be rolled. I'll be going through this process either Friday of this week or Monday of next and will post my findings.

I'm going to be mounting the new Forgline race wheels on my '02 TT race car that still has the stock fender's however the lips have been rolled.

Be patient with the car out of slow/tight corner's.

Rick

ColorChange

I will be fitting my 265/35-18's up front tonight mounted on Fikses. I will let you know how it goes.

BigBagBen

Excellent guy's..that's the sort of info I need..Thank you.

Gilhart 54

CC,

What tire brand are you mounting?

Thanks,
Rick

Dock

Any problems with the AWD when using these different than stock tire sizes? That is, is the radius the same as OEM?

Greg Fishman

I know guys that used 275's on a N/A 996 so you guys shouldn't have an issue if your wheels have the right offset.

Dock

It's the AWD issue I'm talking about.

Greg Fishman

My reply wasn't to you but, the 275/35/18 tire has a O.D. of 25.2" and the 305/30/18 has 25.6". That should be in the range of allowable difference. The 275 is a better fit than the 245/35 with the 305/30 or the 335/30. Go to www.hoosiertire.com for the complete list of specs for the RS04's

Dock

I didn't think your reply was to me, I just wanted to clarify the tire size as being an AWD issue.

As for overall wheel diameter, what is the published maximum difference front to rear?

Greg Fishman

I think the conventional wisdom was less than an inch difference was acceptable.

Dock

What's Porsche's wisdom on this, with regard to the impact of different diameters and the associated operation of the AWD?

ColorChange

I am mounting MPSC 265/35-18's. It's late and I haven't taken it out yet but I definitetly will have to do some adjustments. I will have more tomorrow.

Gilhart 54

Dock,

I'm running both Pirelli and Dunlop slicks and keeping the diameters as close as possible. So far I believe I've stayed within .2 of an inch. All seems fine with this setup. When I say all is fine I mean there have been no overheating or premature wear issues with the drivetrain. I also should mention that diff. and tranny fluids are changed frequently.

Porsche has already told us what safe diameters to use by what comes on the car from the factory. I would stay as close as possible to prevent any overheating of the front diff.

I should know something later in the week after my Forgelines are built and mounted regarding wheel fitment.

Forgeline info at Forgeline.com

Rick

Dock

Rick - I think staying as close as possible should be the goal. Staying within .2" is reasonable.