Are you running a 225 245 tire setup?
 

Is so, can I ask a few questions and get some pics? I have a 7 inch front and 9 inch rear setup. Not sure I'm loving the fit. And for sure had to roll the fenders with a one finger gap up front.

What size wheels?
What offsets?
Did you roll the fenders?

A pic would be great as well. Thanks!

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225 / 245 Bridgestone Re11
951 8" Fuchs up front - 23.3 Offset - 2.0 degrees negitive camber
911 9" Fuchs on Rear - 15 Offset - 13mm spacer - 2.7 degrees negitive camber
Front fenders rolled- No rubbing!



http://forums.pelicanparts.com/uploa...1474429656.jpg
http://forums.pelicanparts.com/uploa...1474429931.jpg
http://forums.pelicanparts.com/uploa...1474430643.jpg
http://forums.pelicanparts.com/uploa...1474430709.jpg

225/45x16 on 7" ET23 front and 245/45x16 on 9" ET15 on rear, using Kumho V700 tyres. Rolled front fenders.

http://i226.photobucket.com/albums/d...psgs9qtjxm.jpg

http://i226.photobucket.com/albums/d...psqpvdrcua.jpg

Mark

Had to dig into the archives to find pre-9" front wheel pics. 225s on 17x7 ET23.3

Camber = yes, maxed out
Rolled = no
Rub = On factory camber plates maxed out, very rarely I got a light bush against a lip on one side if
I had the perfect combination of wheel angle, cornering load, and bump. Aftermarket plates no rub.

http://oi39.tinypic.com/17qsyt.jpg

Holy cow did I have my car too low:
http://oi60.tinypic.com/1g6io4.jpg

http://forums.pelicanparts.com/uploa...1474461609.jpg


http://forums.pelicanparts.com/uploa...1474461645.jpg

I like the fit. No issues with rubbing. I don't care for the big increase in mass. The old 15 inch Fuchs where a lot lighter. I just could not find good tires for the highway and general use.

Data point from Porsche,

I have a 84 M491 widebody and it has 7" front 8" rear from the factory.
Front 7" rim specs 205/55/16
Rear 8" rim specs 225/50/16

When I bought the car it had 225/55/16 on the front and 245/50/16 on the rear. This setup was to much tire for those rims.

I replaced the fronts with spec sizes at 205/55/16 front and 225/50/16 rear and the car looks far better. It also seems to handle better.

If you want to use something larger on the 8" rim try 245/45/16 but in my opinion I'd simply follow the factory recommendations.

here's a thread on this topic for my car:
http://forums.pelicanparts.com/porsche-911-technical-forum/882352-84-911-widebody-best-tire-sizes.html

I have 951 8" on the front on my '82sc and they do rub in hard cornering. I too would be curious to know if just rolling the fenders is enough or would I need negative camber? I dont ride track much so dont want a setup that will wear tire prematurely (if that is what negative camber does in fact, I dont know much of these things) Help also is appreciated.

225 re11's rubbed on mine... they make the re11 in a 215 and a 205...

I think I went to a 205... I haven't noticed any decline in braking or performance, and it doesn't rub...

Interesting - I have 225 RE11's They were hard to find up here

I have an 87 with 225's up front with 285's in back. Only rubbing if really hard hit.

It has helper coilovers, so the rear is quite stiff. Front is not.

Probably should add spring/suspension specs as well.

Modest negative camber alone doesn't wear tires appreciably. Leaning slightly sideways ain't no big thing for a modern radial tire. It's toe that wears tires quickly. Toe in or toe out points the tires in opposing directions other than straight ahead. This makes them fight each other slightly, in a tug of war, dragging each other laterally. Overs thousands of miles it adds up.

Caveat: a little bit of toe in is actually a good tradeoff for a touch of tire wear - it adds stability to the car on the freeway. But note a little bit goes a long way.

As much as -2° or so of camber is totally fine for a daily driven performance strut suspension car. More than -3° gets pretty hardcore, but I don't think you can get that much out of the OE camber plates on the front of a 911 at any common ride height.

22/30 T-bars. -2+ camber. Fenders rolled. 225/245 Khumo 710s. 7 & 8 " Fuchs. No rubbing, but the camber is necessary to avoid it. Sorry the poor shot.
I will say that this is my AX setup. For the street and DE I prefer 205/225 tires.
http://forums.pelicanparts.com/uploa...1474482168.jpg

I'm with Sal: a 225 is too much for a 7" wheel, unless we're talking strict class rules and crazy stiff sidewalls like Hoosiers. Or a short-profile 225/45/16 combined with stiff sidewall, like I run (Z2 Star Spec on a 7).

Also agreed with Matt, camber itself won't rip through tires unless you're a strict highway warrior (and even then).

I've found that these tire clearance threads are full of too many variables, since even the bodies in white from Porsche had variances! My personal favorite way to fit more tire is negative camber, because I enjoy the turn-in benefits. Fender rolling can be risky unless you're a pro (or take it to a pro), but that is also a nice way to free up otherwise wasted space.

I got 225/50/16 and 245/45/16 Toyo Proxies TR1 and have a slight rub upfront with rolled/trimmed fenders. Believe the 225s are slight fat for a 7 and would prefer a 205/50 maybe

225/50 x16 want a 6 to 8" wheel, 7 is fine, 6 is best for ride and 8 is best for performance

225/45 x16 want a 7 to 8.5" wheel, 8 is fine, 7 gives the best ride and 8.5 the best performance

225/45 is easier to fit on a 911 front than 225/50 x16 because it is shorter(~.9") and allows more ride height leeway.

excessive camber and toe will wear tires either alone or in combination, note that stock spec is 0 toe and close to 0 camber
911 street specs
front
height 108+/-5mm
toe 0° pressed
camber 0°+/-10'
caster 6°5'+/-15'


rear
height 12+/-5mm
toe in +10'+/-10'
camber -1°+/-10'

Current setup:
F: 205/55/16 (7”)
R: 245/45/16 (9”)

No rubbing or any issues

light guard roll, no rubbing.
17x8 +23 235tyres front
17x9.5 +13 275 tyres rear
http://i.imgur.com/SFhaqIY.jpg

Also as mentioned before big tires weigh more and you'll loose acceleration rate, HP to the ground will be reduced. So the trade off is a balance between best performance with least rotating mass weight. For our 210-220WHP cars this really matters, here's a great article on the topic with test results:
Effects of Upsized Wheels and Tires Tested - Tech Dept. - Car and Driver
Great read and real world data points, look closely at 0-60MPH times and 1/4mile times.
The 0-60 time went down by nearly 4% with the really big wheels. These losses are greatest the higher the acceleration rates are, this means you will loose time when it counts the most, like leaving a tight turn on the track.

The test results are real eye opener when you calculate the % lost you quickly see that the 0-60 time went down nearly 4% but the 1/4mile time went down only 1.3% on a tight track the 0-60 is a better representation on what you are giving up.

Looking cool != FAST!

To avoid tire rub, some folks resort to raising ride height, installing stiffer springs and/or changing alignment specs. I wouldn't compromise suspension settings to do that. Better to provide the necessary clearance in the wheel well (cut or fold lip) along with choosing the correct combination of tire and wheel size and offset.

Sherwood