997 2005-2012 911 C2, C2S, C4, C4S, GTS, Targa and Cabriolet Model Discussion.
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295 vs 305

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Old Feb 20, 2014 | 05:39 AM
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305's on mine.
No issues with rubbing but then I haven't lowered the car either.
 
Old Feb 20, 2014 | 06:33 AM
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same here, I have 325 on the rears and 245 fronts
 
Old Feb 20, 2014 | 06:58 AM
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My c2s also came with the Carrera Sport wheels which are 11.5 and the recomended size are 305's
 
Old Feb 20, 2014 | 07:18 AM
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My C2S came with Turbo wheels. I asked the same question before because PSS 295's were completely out of stock. So I had to replace the tyres so I switched to 305.

No issues at all. And I do agree that it does look better than 295's
 
Old Feb 20, 2014 | 07:40 AM
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Originally Posted by simoncpw
My C2S came with Turbo wheels. I asked the same question before because PSS 295's were completely out of stock. So I had to replace the tyres so I switched to 305.

No issues at all. And I do agree that it does look better than 295's
Can you be more specific about why you think it looks better? The sidewall is technically taller so it's of a very slightly higher profile.
 
Old Feb 20, 2014 | 08:01 AM
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It's actually wider by 10mm, so it looks more staggered, saved me from installing a 5mm spacer!
 
Old Feb 20, 2014 | 08:38 AM
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it is taller but overall the wheel diamater isnt even 1% larger then a 295. visually from the side itll look almost identical.

however from the back, its technically 4 wider so the tires will look even fatter (more aggressive)

Originally Posted by 911CSLover
Can you be more specific about why you think it looks better? The sidewall is technically taller so it's of a very slightly higher profile.
 
Old Feb 20, 2014 | 10:27 AM
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Old Feb 21, 2014 | 11:18 AM
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Made the switch ti 305's and I am very happy.
 
Old Feb 21, 2014 | 11:42 AM
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Its all relevant to the widths and offset of your wheels. On my narrow body, I have ran 295 - 305 and 315. I personally like the 315 best, but I had to go down to a 225 on the front so the diameters would be more of a match. As of right now, I am running 245s and 305s, but the 305s I am currently running are a lot wider than my 315s were.
 
Old Feb 21, 2014 | 02:21 PM
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Glad to see this thread since it has answered some of my questions.

Now here's a new one - I run 295's currently, lowered on H&R (still plenty of room between fender) with 18mm spacers!! If I add another 5 mm to the outer part, (since it's 5mm per side of the wheel hub, correct?) will it be too much?

Hmmmm..... anyone?
 
Old Feb 21, 2014 | 02:55 PM
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Originally Posted by Perk10
Glad to see this thread since it has answered some of my questions.

Now here's a new one - I run 295's currently, lowered on H&R (still plenty of room between fender) with 18mm spacers!! If I add another 5 mm to the outer part, (since it's 5mm per side of the wheel hub, correct?) will it be too much?

Hmmmm..... anyone?
Thats not 100% how it works out. Different tires different shape sidewalls and rim protectors that make them sit differently or sit wider versus other tires the same size. For example, my 315/25/19 Toyo was actually narrower than my 315/25/19 Michelin. Currently my 305/30/19 Pirelli PZero R01 is a lot more wider than the Michelin. It looks like it could have been a mislabeled 335 and now causes a very slight rub on big dips.
 
Old Feb 21, 2014 | 03:36 PM
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Originally Posted by sleek-sam
Thats not 100% how it works out. Different tires different shape sidewalls and rim protectors that make them sit differently or sit wider versus other tires the same size. For example, my 315/25/19 Toyo was actually narrower than my 315/25/19 Michelin. Currently my 305/30/19 Pirelli PZero R01 is a lot more wider than the Michelin. It looks like it could have been a mislabeled 335 and now causes a very slight rub on big dips.
that's a good point. fwiw, the tire in question is the Michelin Pilot Super Sport...

What I am wondering is, given that 315 is supposedly 10mm wider than 295mm, since it's 10mm TOTAL, then wouldn't it only affect the outside by 5mm? I think my car would look good with a taller sidewall in the rear and 5 more mm but 10mm extra would be doing way too much given the 18mm spacers.

Also, I am hoping to get a bit of a taller sidewall considering I still have a good inch and a half of space!
 
Old Feb 21, 2014 | 03:47 PM
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Originally Posted by Perk10
that's a good point. fwiw, the tire in question is the Michelin Pilot Super Sport...

What I am wondering is, given that 315 is supposedly 10mm wider than 295mm, since it's 10mm TOTAL, then wouldn't it only affect the outside by 5mm? I think my car would look good with a taller sidewall in the rear and 5 more mm but 10mm extra would be doing way too much given the 18mm spacers.

Also, I am hoping to get a bit of a taller sidewall considering I still have a good inch and a half of space!
315 to 295 is actually 20 and in theory difference in width is divided in 2 so additional 10mm per side.

305/30/19 has slightly more sidewall than 295/30/19

315/25/19 has the least amount of sidewall compared to those two.


What you are trying to do is all relevant to wheel width and actual offset. On my car sitting still, both the 315 and 305 had the top of the tire poking past the edge of the fender slightly. When driving it is for the most part find since camber will pull the top of the tire inwards as the suspension compresses. I think the main thing for you would be how you want the tire edge sitting in relation to the fender edge. Worse case, you can go smaller spacer.
 
Old Feb 21, 2014 | 03:54 PM
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Originally Posted by sleek-sam
315 to 295 is actually 20 and in theory difference in width is divided in 2 so additional 10mm per side.

305/30/19 has slightly more sidewall than 295/30/19

315/25/19 has the least amount of sidewall compared to those two.


What you are trying to do is all relevant to wheel width and actual offset. On my car sitting still, both the 315 and 305 had the top of the tire poking past the edge of the fender slightly. When driving it is for the most part find since camber will pull the top of the tire inwards as the suspension compresses. I think the main thing for you would be how you want the tire edge sitting in relation to the fender edge. Worse case, you can go smaller spacer.
whoops I didn't mean to type 315. I mean 305 as the thread states... and what you said is spot on. I may have to get a smaller spacer which I guess I would rather not do since it's more money down the drain
 


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