bugkiller930

Just recently purchased brand new set of RUF 19". Had it installed and now every time I make a hard turn, the front wheel scrapes. Is the 19" too big? I really don't want to switch to 18" after seeing how the 19" looks on the car. Talk to the mechanic and he said it seem like it was hitting the inner well. Do I have to raise my car? Want to get some advice before bringing it back to the shop.

Replaced A-arm bushing, align and corner balanced before putting on the wheels.
ROW Height with stock M030. (bought it like this)
RUF 8.5 & 10x19"
RUF rear spacer 28mm
Michelin Pilots 245/35ZR19 front and 285/30ZR19 Rear

AC/911's

Your new tires are 25.8'' (taller) circumference, all 993tt's ran 25'' to 25.2, or might need bigger front spacer.

bugkiller930

Oh, I was told by the shop and this was his exact words " On twin turbos it is important to use these tire sizes, as they are the same diameter front and rear to ensure your four wheel drive computer does not get upset. "

I don't mind replacing new tires, still cheaper than replacing suspension I guess.

bugkiller930

OK, so I just took the car out for a midnite run to buy some milk. The scrapping is coming from the Right rear not the front. Doing 40-50 mph and making a hard left caused the right rear to scrape the fender well. Left rear seem untouched when I make a hard right. So I don't get why would the right rear hit. Anyone know what's going?

Mike J

I am running the 19" RUF's, and RUF spacers and am having no issues with rubbing (and my car is quite low).

My tires are Sumi's, 235/35 in the front and 275/30 in the rear. My rolling diameters for the fronts are 25.47", and the rears are 25.49", virtually the same and well handled by the AWD.

Weird though, it almost looks like your rears are farther out than mine. From the rear, my car almost looks like the wheels are inset too much.



I cannot remember the exact spacer in the rear, I can check. I too have the RUF units.

Perhaps your suspension travel is too much? It looks by the tire scuffs that the wheel is rubbing the outside lip of the wheel well - mine are well clear of that.

Are you running the 996 RUF wheels or the 993 or earlier RUF wheels? The 996 version is 11" wide, the 993 and before 10", and the offset is different. That could make a difference. You can tell by the stamping on the inside of the wheel, or just measure the width.

Cheers,

Mike

bugkiller930

Hey Mike,

Yes, your wheels does seem more inner. Here is the side view pic of mine I took this morning. Will try to take a better view tomorrow.

I look at the stamp and both rear are 10x19 ET 66. Measured both spacers and they are pretty even at 1 -1/16".

Can you measure your spacers and let me know.

Thanks
Kenny

malcolmd

If this is just the rear you will fix this in one of several ways:
1. reduce the spacer size to move the wheel inboard. You will need to check clearance on the inside, but if the wheels are the correct offset (i.e. 40) it will be fine.
2. Have your body shop carefully roll the inside sheet metal at the top of the rear wheel arch. This will give you an extra cm clearance. Do this if you have confidence that a cm more clearance should do the job.
3. Increase your negative camber at the rear to say -2. On a tall wheel tyre combination this makes a fairly significant difference to the clearance upon suspension compression where the wheel will move far more inboard.
Alternatly, you can do a combination of the above.

I have 19X11 and 19X8.5 running 295/30 and 235/35 without rubbing on a car considerably lower than ROW. It does have -2 rear camber.

Good luck. I know what you mean by wanting to keep the look.

azmurciev12

just run more rear negative camber.

DM993tt

Many of the guys here run 315's on the rear with no issue. Your tire guy is correct in saying that you want tire circumference the same F to R (generally within 4% of eachother), but not necessarily correct in saying it has to be 25.8. Not that 1/2in in diameter is going to mean rubbing or not. Thinner spacers is probably your fastest & easiest fix (if you are running them at all), then dialing in the rear camber to -2.0 or -2.5 (the latter being agressive for street use) Rolling fenders can crack paint & doesnt yeild a ton more space. But get it sorted before you drive much more. Your rubbing looks minimal thus far, but you dont want to hit a bump under load and cut a tire - then you could be trying to replace a fender and a tire.

malcolmd

Thinking about this a little more, you will easily sort out the rear as outlined above, however, I do suspect you might be rubbing on the rearward side of the inside well of the front wheels on max turn out of that wheel. I rub in this situation when using Hoosiers R6 255/35/18's on 8.5 rims with the correct 46 offset. These are wider than yours by a small amount, but are significantly less tall at 24.9". Your added height 25.8" will more than overtake the significance of the narrower width on the diagonal created by turn in/out. Bear in mind the stock 225.40/18 is only 25.1". You might need front spacers.

Steve has RUF wheels on his Turbo R and knows all about the tyre options. Hopefully he will chime in.

Mike J

Hi Kenny,

I will measure the spacers on my car and get back to you - it will this evening since I am at work. :-)

Cheers,

Mike

bugkiller930

I was thinking about 1) reducing the spacer size but 3) make a lot of sense. 2) is a NO NO for me, I might as well do a GT2 fender flares.

I called a few mechanic shops but none know what's going on. Anyone know any good shop in the Bay Area?

ca993twin

I have Ruf 19" wheels with the (approx 1") Ruf spacer. My rear wheels are 11". I use 315x25x19 on the rear (255x30x19 on the front). I have no rubbing issues, and use a very non-agressive rear camber (to preserve tire life). Mine are the same height as the factory delivered 18" tires.

Bradford

Are you sure it is rubbing on the rear? As Steve, I am running Ruf 19x11 with 315's and I have some very minor rubbing. But on the front, I have the same size tires as you and they do rub. I would double check to make sure that it isn't the front that is rubbing. Only choice you have there is to go with a 235 or add some negative camber.

For the rears to rub with 285's you would have to have some very thick spacers.

I use the spacers on the left with long studs whereas the spacer on the right is what typically comes with a set of Ruf 19" wheels.

boostid

Kenny,

Agree with the idea that it's likely the front. I have the 8.5 (offset 56) fronts with 245/35/19 S03s and 10 (offset 66) rears with 285/30/19 S03s. Rears use the 28mm spacer. I get some minor rubbing on the right front on certain downhill angled driveways when turning. Nothing in the rear. I even used a 35mm rear spacer for a bit and noticed no rubbing in the rear. My car is well below M030 specs. Standard factory alignment, nothing exotic. By the way, the 245/285 combo is recommended by RUF for the 993TT for their 8.5/10 19s.