Jeff Curtis

Too funny Horst! <img src="graemlins/roflmao.gif" border="0" alt="[hiha]" /> I get the idea that Renny is a Ruger or other German variant?

Horst, you have the Mille Miglia "Cup IIs"...I rethought the backspacing thing and realized that I may have it all wrong. That is a subject that has always gotten me. <img src="graemlins/cussing.gif" border="0" alt="[grrrrrrr]" />

I actually think now that you won't need any spacers in the front, as your wheels should fit like mine with 3mm spacers! ...meaning, the way my front wheels fit with my 3mm spacers added is how yours should fit without spacers...the added width will be to the outside of the vehicle vice towards the inner fenderwell. The fact that your wheels are 7.5" and 52mm backspacing means that you will have 15.7mm to the outside of the vehicle when compared to my 7" wheels with 55mm backspacing. You have 3mm less towards the inner fenderwell than I do.

Overall, I think you have a wheel that will fit better than mine!??

Again, did that make any sense?? I say get ahold of a used 205/17 tire from one of your many contacts that we visited in the Springfield area, have it mounted and try it out...somebody's got to be willing to help you out?

Your front wheels should fit no problem now that I think about it. You should be able to fit a 215, maybe even a 225 on there too!

The steering stops are spacers of sort that go on your inner tie-rod ends, they actually stop the movement of the tie-rods from left to right by coming into contact with the steering rack, a limiter for all intensive purposes.

Adrian

Dear 964spd,
As for lowering and causing wheel rub when you did not have it before. Well this is something that can happen and does happen. You have to be careful, test each setting and basically find the one that does not cause wheel rub. It is quite easy to lower 3 to 5mm too far and get wheel rub. Unfortunately there are no rules for this just trial and error. Of the most importance when you lower is to check the wheel alignment, the corner weight and the level.
Ciao,
Adrian
911C4

jonfkaminsky

Horst- I'll beg to differ with Jeff on this one. I am running the exact wheel with RE730 205/50R17's on the front. My car is lowered about an inch in front. They rub. Unless your car is markedly different from mine, I wouldn't expect better results from a 215 or 225. Couldn't hurt to try, though, if the trying is for free.

horst

the one thing neither jon or jeff commented on, id that there may be a difference C-2 vs my 90 C-4. Adrian seems to be the C-4 guru, mabey he can comment <img src="confused.gif" border="0">

Adrian

Dear Horst,
There are differences up front between a C2 and C4. First there is a thumping great differential plus the wheel drive shafts. The front section of the foward floor pan is different. The front springs are slightly thicker and the wheel arch design is different on a 1989 MY C4 versus the rest. The vast majority of damage as against rub marks, I have seen, caused by wheels, has been on C4s rather than C2s. However I have helped a couple of RSA owners who had major wheel rub as well. That was fixed by raising them up by 5mm.
On a similar subject I have been working closely with a 3.6 Turbo owner in the USA in working out the differences between ROW and USA. If you refer to the parts catalogue it says the parts are the same. It turns out that this is completely false.
Ciao,
Adrian
911C4

Jeff Curtis

Adrian, Horst and I spoke on the phone last night, his main question was if the hub to inner fenderwell distance was any greater/less than on a C2...I told him I didn't believe it was, but who could "eyeball" a 5mm difference if there was one?

So, I think that's what we basically need to know, Is there a difference or is it the same hub to fenderlip/inside fenderwell relation??

Adrian

Dear Jeff,
This kind of measurements data is not available to us mere mortals. However I can tell you with some confidence that I bet you can measure a whole bunch of 964s and you will find they are all different. Seeing as you have a C2 and Horst has a 1990 C4 why not pick two datum points and just measure them and compare.
I will see if I can find anything but it will still only be a guide. I do know for a fact that the distance is shorter on a 1989 C4 because I have the reason for the design change which was, to increase the clearance. Mind you I have to caution everyone. It is not just the inside the wheel arch that wheels rub on. I have seen nice spring rub marks on many a tyre and vice versa of course. I have also seen (I have it on video) chopped tyres on the outer edge caused by rolled fender impacting the outside of the tyre. This was also a C4.
Ciao,
Adrian
911C4

PS: Since I got my C4 back from the wheel swap on saturday something just did not look right. As most of you know I have other things to think about and deal with right now so my C4 has been neglected a bit. Anyway seeing as I am at work and we have this new cleaning equipment I decided to try it out and give the old girl a tub. Much to my amusement I have discovered that my mechanics left my 15mm spacers off my winter tyre set up "ON". I have no idea how they missed this. So I can now with the physical evidence at hand say that 9JX17 wheels can be fitted without hitting the fender with 15mm spacers installed. I have to admit the rear looks like a turbo now but they have to come off because it ruins my tyre testing to leave it like this. Or I can install the 5mm front spacers and try that. I will see. To use the words of our milka chocolate advert man, "Its Kool Man". I am into a little kool at the moment.