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Tire Sizes

Anyone know what the largest tires I could put on an 85a 944 would be? Where could I find the little gears to recalibrate the speedo? Just a thought. . .

Thanks!
Old 02-06-2004, 05:26 PM
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Largest is 17s unless you want to modify your suspension. I would say just get used to the amout your speedo is off, no need to tear things apart. My stock 16s were way off and when I got 17s it was much closer to my actual speed (read higher than it is).
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Old 02-06-2004, 05:56 PM
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According to Tire Rack you can put 205/50 17 on the front and 255/40 17 on the rear. If you use a system called "plus sizing" it wouldn't really be necissary to recalibrate. As the rim diameter increases the tire profile decreases thus the overall wheel diameter doesn't change. Essentially you would have the same size wheels. You could take the stock setup and sit it next to the 17" setup and they would be the same size.
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Old 02-09-2004, 08:09 AM
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The widest tire you can get on the fronts (on 16' wheels) is 245-45/16. You can go a little wider in the rear: I know 255's fit, but I'm unsure of the aspect ratio.

BTW: Porsche doesn't recommend going with a larger diameter tire (15's and 16's were standard or optional diameters, depending on the model). Going too big puts too much stress on the suspension components. There was a Porsche technical bulletin regarding this.

-Z.
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Old 02-09-2004, 09:13 AM
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That makes good sense too.
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Old 02-09-2004, 12:11 PM
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Thanks guys!

I was sort of thinking about 16" rims - the car has the stock 15" cookie cutter rims now (which I actually kind of like) but I think a bit more metal / rim and a slightly lower profile tire would add a nice modern look to it. Width-wise, I'd be okay with something just a bit wider than stock (doesn't have to be huge). Any tire manufacturer recommendations?
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Old 02-09-2004, 12:18 PM
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I am currently running Yokohama AVS ES 100's on my car and I love them. I use the car for Auto-x and summer fun. I have 225/50/16 on the front and 245/45/16 on the rears all on phonedial wheels. People say that you shouldn't have that much rubber on the rear because it causes more understeer but with proper tire pressures and sway bars you can make it perfect. Plus the rear tires make the car look good from behind. My .02...
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Old 02-09-2004, 04:12 PM
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Quote:
Originally posted by Z-man
The widest tire you can get on the fronts (on 16' wheels) is 245-45/16. You can go a little wider in the rear: I know 255's fit, but I'm unsure of the aspect ratio.
What rims would this be? 16"x8" in front, 9" in the rear? Has anyone run 16x9" in the back? What offset is that - 53/55 or 70? My car is lowered, I have the 7" in front, 8" in rear, but I have an extra set of 8" PDs, and was trying to determine if I should try fill out the set with 7,8, or 9s. I would love to get 9s in back, 8s in front, and have 245/45 up front, 255 in back, that would be nice.

TNT25169, my 951 sees substantial track use (track+autox), and I haven't found understeer to be a problem with 16x7/8. There is more understeer with street tires than with Kumhos though. Both of my Porsche are extremely sensitive to tire pressures, so dialing in the TP is always my first concern.
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Old 06-09-2004, 08:43 AM
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I'm about to replace the tires on our 944 n/a and I have someone who will give me a set of Yokohoma AVS Intermediates. The only potential problem is that the tires are 225/60/15 compared to the 215/60/15. Does anyone think it may be a problem going to a 225?
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Old 06-09-2004, 06:30 PM
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My dad got a set of 18" turbo twists. For kicks we put the rears on my car. They fit perfectly. 265/35/18 on 10" wide rims. It was close but they fit perfectly. He promptly took them back.
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Old 06-09-2004, 06:41 PM
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225/60/15 will fit but make the gearing even higher than it is now.
All the 944s I've driven with that tire size feel slow and first gear is a real problem on steep hills.
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Old 06-09-2004, 06:55 PM
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Quote:
Originally posted by Britwrench
225/60/15 will fit but make the gearing even higher than it is now.
All the 944s I've driven with that tire size feel slow and first gear is a real problem on steep hills.
Just what my wife and son need......A taller first gear on the steep hills. Sounds to me like a set of tires with the right size will be cheaper than replacing a clutch!
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Old 06-09-2004, 06:59 PM
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Quote:
225/60/15 will fit but make the gearing even higher than it is now.
All the 944s I've driven with that tire size feel slow and first gear is a real problem on steep hills.
Hmm, that might be the problem. I've got 225/60s on all four. Although..first gear still feels quick once you hit about 2500RPM, doesn't last long though--soon out of gear.

What should I run then, for the street? It sees pretty spirited driving, so cornering is a must...
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Old 06-10-2004, 01:35 AM
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I race on 225/50/15's, but my street tires are 225 and 255's 0n 17" Fikse wheels. 8"in front, 9.5" rears. No problems. There's room for 275's in the rear.

Yeah, it looks cool, but the car handles best with the 225's all the way around.
Old 06-10-2004, 05:08 PM
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Quote:
Originally posted by Dantilla
Yeah, it looks cool, but the car handles best with the 225's all the way around.
Why? I am interested in your thoughts, I've been running225/245s, car is extremely dialed in, but thought that going to 8/9 or even 8/9.5" (with 16") would give me a little more bite.

Also, what is the offset of the 9.5" rims?
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Old 06-11-2004, 04:23 AM
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Quote:
Originally posted by naparsei
Why? I am interested in your thoughts, I've been running225/245s, car is extremely dialed in, but thought that going to 8/9 or even 8/9.5" (with 16") would give me a little more bite.

Also, what is the offset of the 9.5" rims?
If you haven't noticed already, 944's are notorious for understeer. If you race you car and want the most from it, it's best to run the same size tires all the way around and use swaybars to adjust for understeer/oversteer so you aren't sacrificing grip of tires by playing with tire pressures. But as street tires, 225/245 will do just fine. My .02 once again...
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Old 06-11-2004, 08:14 AM
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Quote:
Originally posted by TNT25169
If you haven't noticed already, 944's are notorious for understeer. If you race you car and want the most from it, it's best to run the same size tires all the way around and use swaybars to adjust for understeer/oversteer so you aren't sacrificing grip of tires by playing with tire pressures. But as street tires, 225/245 will do just fine. My .02 once again...
My 951 is primarily tracked. Understeer is compensated at the swaybar/shock level, car is very neutral, with hint of oversteer. Usually run Victoracers @ 38 psi cold (all around). Want to try more tire all around. I know the conventional wisdom of equal tires sizes front/back, which I will probably try at some point as well.

What offset for a 9.5" rear wheel?
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Old 06-11-2004, 08:26 AM
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Quote:
Originally posted by naparsei
What offset for a 9.5" rear wheel?
no clue....sorry
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Old 06-11-2004, 08:29 AM
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It's just more fun to drive when the rear drifts out.

I just hate understeer, that's all.
Old 06-11-2004, 09:29 AM
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I run 50's on all fours. Be prepared for a much roughr ride. than if you run 60 hieght. It will really chatter your teeth. Alot more road noise also. But...It does stick to the road with less roll on twisties.
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Old 06-11-2004, 09:56 AM
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