RallyJon

Part number 993.362.124.05. Saw them referenced by Adrian Streather here:

http://www.porsche964.co.uk/technica...nd%20tyres.pdf

Seems like a good solution for running 225 fronts while looking stock. What car did they come stock on? Anybody tried them? With a 65mm offset, they'd need a spacer I guess.

Bull

I am aware of them, but haven't used them. I have found that 225s work well on a 7" wheel, and you can use 235s on the 7.5s.

RallyJon

I guess it depends on the tire. I tried 225 S-03s on 7s (another car) and they looked pinched, but S-03s were pretty wide for their nominal size.

Adrienne

I have 225 on the front with the 17X7 rims. Kumho Ecsta MX fits fine.

Bill Verburg

I always liked the Design '92s but would want 8 & 9 x17 minimum, 225/45 & 255/40

Edward

I don't think a 1/2" difference is enough to make a, um, difference. Not to mention the need for a hub adaptor which adds weight and complexity (another thing to check). Now going to an 8" rim, OTOH, is significant, IMHO. I think the old Speedline Supercups in 8 and 10 x 17 are a great choice.

Edward

rlets

I'm with you, RallyJon. The spacer is a little unfortunate (12mm?), but I'd like to get a stock looking 7.5 up front to run 225s.

Rich

Bill Verburg

The spec rim range for a 225/45 x17 is 7-8.5", to maximize ride use a width at the small end, to maximize performance choose one from the wide end.

RallyJon

That's a no-mans land spacer. Too thick to just slip on, but not thick enough to have it's own nuts and lugs.

A 6mm (or 1/4") spacer gets the outside face of the 7.5" wheel close to where the stock 7" face is. Not great for wheelwell filling, but would probably work fine.

RallyJon

OK, picked up a set of 968 M030 wheels (7.5 fronts with 65mm offset, same as 993 9s in back) this weekend. I test fit one this weekend and it does need to be spaced out a bit. The inside of the wheel comes very close to the spring, it looks kind of silly, and adding 10mm of negative scrub can't be good for steering feel.

Since I'm running stock 7s and 9s for winter, I'm not keen on changing studs, unless there was a perfect length that would not bottom out the lug nuts with the stock 7s, yet would allow the necessary 7.5 turns of engagement with the 7.5s and a spacer. Without a spacer, I have exactly 12 turns of engagement. 12 - 7.5 x 1.5mm pitch = 6.75mm maximum spacer thichness with stock studs. It's a close call, but I think I'm going to try the 7mm H&R spacers.

Given the 65mm offset with a 7mm spacer, that's a net 58mm offset, or only 3mm different from stock. With wheels that are 12.7mm wider than stock, they'll stick out 3.35mm farther to the outside and 9.35 mm farther to the inside than the stock 7s. Without the spacer, they'd be 16.35 mm farther to the inside and -3.65mm on the outside.

RallyJon

Got the spacers and did some test fitting today. Here is a comparison side by side of the stock wheels (with winters mounted) and the 7.5s both without and with H&R 7mm spacers. Sorry about the shadows, but you get the idea.

RallyJon

Oh, and about the studs, this is odd: H&R sent studs that appear to be the same length as stock studs. Maybe they have one extra thread, but they look pretty close to me:

ZombiePorsche44

I'm only talking front's here.

I have the factory 7.5" X 17" cup II's on the front of my car but they have a 55mm offset and do not require spacers.

If you run a 225 or 235 tire on a 7" wheel, the sidewall flex will kind of negate the advantage you may gain in cornering, but they will still give you better braking performance vs a 205 tire.

I run 225's on my 7.5" and will only run 235 & 245's on an 8"wheel.............ZP44

RallyJon

Really!!! I didn't know they existed. Please post the part number.

ceboyd

yeah, the 17x7.5" ones were actually meant for the front of a 928 IIRC

I remember ALSO a 17x8 for winter rear but people wanting to put them on front..