Looking at wheels with the following spec's:

Size (front) 18 x 8.5
Size (rear) 18 x 10
Offset 52MM-F, 48MM-R

I have a 03 C2...

A 48MM rear offset looks about 17MM less than the stock Turbo Look 2 18's that I have on the car.

Is this reasonable? Will it look odd or rub?

I was planning on using the current tires which are 225/40 and 265/35. Are there better size recommendations based on the above details?

Thanks in advance!

PRH

 

PRH
48mm offset on the 10J looks great (IMHO) and even if you lower the car, rubbing should not be an issue.....no fender prep needed. You may be aware that 10J 18 is also the Porsche optional rear wheel for the 996........however the tire designated for that wheel is 285/30 (not 265/35 you describe as 'current tires').

The fronts that are the OE option are 8J (vs the 8.5 you mention).......the 225/40 is what goes on that 8J rim.....however I'm not sure how that tire would be on the 8.5.

BTW......the ideal offset (IMHO) to go along with that 48 in the back would be around 45 in the front (for an 8J rim) and that 8.5 should be pretty close to that as-is (assuming the 8.5 is do-able).
Final thought.......may want to check rolling diameter for ABS.

Good luck

 

Thanks for the reply, GreggT!

I just got 2 of the rims in the mail and they look great. The other 2 caught a DHL truck instead of the plane and will be here tomorrow.

I just bought the car last week, so I am in a learning process still. It's clear those are the original size tires now. However, I spoke to 2 people running the same exact wheels (one a 911 and the other a 928), and they are using the tire sizes I listed, so I should be ok.

But when it's time to change tires, I would like to go up to the 285/30 front and something line 235 front...

Do you have a feel for whether I will have a problem with the 285's rubbing on those rims in the back?

Thanks again!

PRH

 

Here's OE Carrera 10J rim spaced out to 48mm.....(on a slightly lowered suspension with OE 285s)........no problem.
BTW.....the fronts in the pic are also 'about' the dimensions I referenced if that helps at all.

 

That looks good, but man, does that look close to rubbing on the rear...

I meant to say before that it is clear that I do NOT have the original size tires on the car. Not even the same tire front to back, but they are all Conti's...

I am looking at the rims with no tires on my car, and the backs do look just a little to far out for me. I did some quick calls and found a machine shop locally that is very familiar with doing work on wheels. I'm going to take the rears to him tomorrow. He said he can easily shave 1/4" or about 6mm off the mounting plate. Maybe more when he sees them. I think this will be perfect for me. That would make the total offset change 11mm different than stock...

The fronts have no caliper clearance to do any shaving, but they are only out 1/4" more than stock, while the rear are almost 3/4" before shaving...

 

You did understand the pic above was a lowered suspension ......OE suspension would have alot more clearance (but even this lowered does not rub unless you really hit an extreme......no damage).
Your pic has wheels 'sitting' under car?.......a weighted suspension on negative camber is a totally dif situation.

BTW....the above wheels are no longer on the car......HREs are.....same offset (48mm) same lowered suspension......they never rub......currently have Mich Sport Rib (285)......but next week get S02As.
Hey bud........just a heads up......personally, I'd never recomend anyone machine off mounting flanges.........but, it's your car, your wheels..........best of luck.

 

Yes, I did understand that it's a lowered car...

I took a hard look at the mounting flange to see how the machining would impact the integrity of the wheel, if at all. Bottom line is they would not be taking off any of the material that supports the wheel face. In fact, it would probably be stronger instead of weaker because they are removing material that is stand alone prior to the spokes on my wheels. The wheels would be closer to the hub with less overall stress as a result.

It would depend on the design of the wheels, but in this case, I feel very safe doing it, and the people I am talking to do it all the time and they are very safety aware.

 

I do have same set on mine C2 cab. The rear is running 285 and it have little rub, remember mine lower with H&R spring. I think 265 will not rub at all. Hope this help!

 

Those look like the highline wheels, I have a set for my snows, excellent value. However, if you have large brakes on the front, like mine, you will actually need spacers to clear. With the stock brakes, you might be ok, just bear that in mind when you mill them down on the front, all local tolerences will need to be checked.

 

Yes, those are the Highline wheels. It's an incredibly cheaper way to have the BBS look.

I will only mill the back wheels which have more than a 1/2" clearance from the brakes.

The fronts only stick out a 1/4" more than stock, so that's not worth messing with. It's the rears that have 3/4" more outwards... The fronts clear my calipers with only a 1/8" clearance.