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YOUR RESEARCHTyre size question...
Reported or suspected cause
same as the 225 stock profile
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I forget the profile, but it was the same as the 225 stock profile.
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I can get the correct 285 30 18 in PS2 (and N rated) but not PS4 (checked via the Michelin website)
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10" wheels, the 265 of the gen1 and the 285 on the gen2 are all on the same size wheels, Porsche just changed the tyre size for the facelift
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On the 996, Gen1 cars use 225/40 front 265/35 rear tyres, Gen2 cars ran 225/40 fronts and 285/30 rears (this is for non-widebody cars so c2 and c4, the later C4S and Turbo versions used bigger sizes)
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As I recall my old 996TT ran 295s on the back and 11" rims.
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On the 996, Gen1 cars use 225/40 front 265/35 rear tyres, Gen2 cars ran 225/40 fronts and 285/30 rears (this is for non-widebody cars so c2 and c4, the later C4S and Turbo versions used bigger sizes)
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Suggestion
If you have 4WD then you're limited to a certain percentage difference in rolling circumference in front to rear, but 2WD cars can run anything that will fit on the rim.
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Suggestion
For the last almost 3 years and 12,000 miles my 2002 c2 has been running PS4 tyres using the 275/35 size on the rears - they were fitted while Chris Franklin at CG was setting it up and he approved of the choice knowing that the rear was a non-standard size (it should be 285/30) but near enough to make very little difference and taking advantage of a much newer design and technology in the PS4 versus the 'old' PS2 type.
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Suggestion
On the 996, Gen1 cars use 225/40 front 265/35 rear tyres, Gen2 cars ran 225/40 fronts and 285/30 rears (this is for non-widebody cars so c2 and c4, the later C4S and Turbo versions used bigger sizes)
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Currently on old rubber on my 2003 C2 running conti's all round. They're DOT is roughly 2012 so getting on somewhat now!
Want to go for Pilot Sport as they seem to be the best all round on the market BUT....
I can get the correct 285 30 18 in PS2 (and N rated) but not PS4 (checked via the Michelin website)
Should I go for these older tyres or go for the new PS4 but in a 275 35 size?
Fronts are no problem, can get these in either!
My preference would be the newer compound as the DOT will be much more recent surely...plus the they're cheaper than the PS2's!
Car sits on 18" hollow spokes.
Thanks!
Actually - scrap that question. Just tried the search function on my work pc (rather than phone) and it's worked this time so think I've got the answers I need! 275 or 295!
Hi Gooey,
I may be wrong (And am happy to be corrected by the wiser amongst us here) but I think there is some commonly held wisdom that suggests not deviating too far from the factory tyre sizes (Which I believe on your 2003 C2 are the same as my 2001; 225 on the front and 265 on the rear). While I believe the 10" rears can quite happily carry wider tyres I believe it is considered best to keep a "Balanced" approach to the tyre widths ie. if you go up from 265 to 285 on the rears while keeping the stock 225 width at the front then you might be inducing a more understeer biased balance to the car (Your rear tyre width / grip is increased while the front remains as standard)
As I say I may be wide of the mark here and I'm kind of hoping one of the "Grown ups" will be along soon to explain the various intricacies of this but in the meantime maybe if you are going up to 275 / 285 on the rears you may want to consider going to 235 (Or maybe even 245 if you have 8" wheels) on the front?
Your call, but just a thought.
Thanks bud.
I think pre-facelift tyres at the rear are 265, 285 for facelift 996.2 cars.
I would have thought that going from 285 to 275 would be fine - particularly when the winter size for a 996.2 is 265 rear anyway...
But good point, I will double check!
On the 996, Gen1 cars use 225/40 front 265/35 rear tyres, Gen2 cars ran 225/40 fronts and 285/30 rears (this is for non-widebody cars so c2 and c4, the later C4S and Turbo versions used bigger sizes)
For the last almost 3 years and 12,000 miles my 2002 c2 has been running PS4 tyres using the 275/35 size on the rears - they were fitted while Chris Franklin at CG was setting it up and he approved of the choice knowing that the rear was a non-standard size (it should be 285/30) but near enough to make very little difference and taking advantage of a much newer design and technology in the PS4 versus the 'old' PS2 type.
I was confused by this a few months ago, currently have a 996.2 C2 and have 285 30 18 rear / 225 40 18 front that I am told is standard.
So the answer is you can run 275 35 18 rear / 225 40 18 front combo with no issues and take advantage of the newer Pilot Sport 4?
Thanks
Yes, like I said above I've been running mine like that for almost 3 years with no problems, a few other have driven my car now, Chris and Pete from CG, Steve Bennett the editor of 911&Porsche World and a couple of others and none of them had anything bad to say about it/them :thumbs:
Oh, but be aware some people on some forums will tell you your speedo will be wildly out, the car will throw random lights up and your
insurance
will be invalidated and you will probably die as they're not 'N' rated tyres.... all bollox of course :roll: :hand:
Yes, there's far more latitude than most people think regarding what tyre sizes you can run. If you have 4WD then you're limited to a certain percentage difference in rolling circumference in front to rear, but 2WD cars can run anything that will fit on the rim. There are plenty of websites out there that will allow you to compare different tyre sizes to see what a change would look like.
My 996.1 came to me with 225/285 and understeered badly. I went up to 235 fronts, but these rubbed the wheel arch liners at full lock and didn't completely cure the understeer. I then got some 17" ten-spokes (the lightest stock wheel available) and used the 205/255 tyres they came with. Other changes had dramatically reduced the understeer by this point and above 30mph the car was nicely neutral. I've now changed to Falken 510s on the front in 225 width and the car is a peach, stopping very well and neutral throughout the speed range, with oversteer on demand.
Given the leaps in tyre tech in the last 20 years, there is no need beyond aethetics to use a 285 section rear tyre on a 996.1 or .2 that isn't a GT3 or a Turbo.
Excellent! Thanks for the insight! They say that every day is a school day!
One question though, on the 996.2 cars; are the 285 tyres still mounted on 10" rear wheels like my 996.1 or do the wider tyres need 11" wheels? As I recall my old 996TT ran 295s on the back and 11" rims.
10" wheels, the 265 of the gen1 and the 285 on the gen2 are all on the same size wheels, Porsche just changed the tyre size for the facelift
and just for interest, the below final geo was done at CG after the new tyres were fitted to my car
Not that I have my rims yet, or am in any danger of them turning up tomorrow, but trying to work out what tyres to go for myself.
245/40/18 front and 295/30/18 rear maybe?
9" front and 11" rear, and thinking of Cup 2's.
What does the 911UK hive-mind think?
Is it turbo charged or supercharged? If not, then the only reason for such big tyres is to look nice. Aesthetics are a perfectly good reason for selecting tyres, in which case the limiting factor is generally scrubbing on the front wheel arch liners at full lock. In my personal experience this happened with 235 section tyres on 18" GT3 sport design wheels. I forget the profile, but it was the same as the 225 stock profile.
If you want something that will drive nicely then you need much narrower tyres though.
Really depends on what goes on the rims - I thought a 225 would be getting somewhat out of it's comfort zone on a 9" rim, likewise 285 on an 11".
The engine is naturally aspirated, so won't be a torque monster - it'll be making its power high in the revs, but the gearing will be significantly shortened to match the power curve.
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