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Early offset 944 max width 17" wheels on the front with stock fenders

I'm looking at getting some 17s for my 944 so I've got some better tire choices. I thought I'd seen people were running 17x9 with 245 or 255 rubber up front, but now I can't find any threads or info. The wheels I'm looking at are 15mm offset on 9" widths and 10.6mm on 8".

Who's got input?

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Old 10-25-2015, 02:08 PM
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Neither of those will work for 255/40r17 tires because they put all the extra width on the outside for those wanting the hellaflush stance with cheap 205 or 225mm tyres. The stock 951 already rubs its 16x7" wheels with 205mm tyres on fenders.

You want to put the extra width on the inside where there's A LOT more room. So to fit a 255/40r17 tyre on 17x9" rim, offset needs to be 35-40mm for early-offset cars. Or 60-65mm for late-offset cars, like what Porsche did with TurboS. Optimum grip for that tyre size is a 17x10" rim.
Old 10-27-2015, 11:34 PM
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a stock 951 rubs its 16x7s with 205s on the fenders? really?

yeah nope. stock they do not rub.

even when you run square with 8s in front, and 225s they don't rub. in fact, we even ran the 8s with 225s on haroldinas car without rubbing.
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Old 10-28-2015, 08:46 AM
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Also, a 15mm offset on a 9" wheel gives me about 3/4" more wheel inboard and about 1 1/4" more outboard compared to a 7" wheel with 23.3mm offset. That can hardly be considered putting all of it towards the fender.
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Old 10-28-2015, 09:36 AM
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with turbo S offset car, MY02 rear 18x10s fit all around. youll have to find the numbers and do the math. I have 285s on them. also, turbo S fenders are rolled, and I have ground controls in front which leave more room
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Old 10-28-2015, 09:57 AM
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I' have been running 245/45-17 on 9" rim in front and 275/40-17 on 10" rim in rear, for many years with good luck.

The sizes do slow the car slightly in straight ahead acceleration in the 1/4 mile, but add .75 G. before break out on the curves.

Have done this with NA's and Turbo's for long time.

Would never recommend any larger rims than 17" for total geometry of suspension.
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Old 10-29-2015, 09:11 PM
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Quote:
Originally Posted by cockerpunk View Post
a stock 951 rubs its 16x7s with 205s on the fenders? really?

yeah nope. stock they do not rub.

even when you run square with 8s in front, and 225s they don't rub. in fact, we even ran the 8s with 225s on haroldinas car without rubbing.
haven't push hard enough I guess. Try hitting bumps with the steering turned all the way. Bumps combined with more than 90-degrees of steering will rub the tyre on the fender at speed. Sure grandma can take any car to get groceries and not rub the fenders.

On early-offset 951, I was able to run 17x10.5" wheels with 255/40-17 tyres by increasing offset to 35mm. Rear 17x11.5" with 275/40-17 tyres, same 35mm offset.

Remember, the OP is asking about 245 or 255mm tires, not 205 or 225.


Last edited by DannoXYZ; 10-29-2015 at 11:39 PM..
Old 10-29-2015, 11:35 PM
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