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Here's pic of Cup 2 in 245 and 325 running on 12 and 8.75 inch rims at 2.5 bar and 2.3 bar hot.
You can see tyre wall movement at the rear and the Cup 2 has a very stiff sidewall. Very interested to know if the stock wheels can handle the 245 and 325 whilst being leaned on for track use. Be great news if they work on the 11 inch and 8 inch OEM rim for sure rather than having tyre come off on track.
For road course duty use I would not squeeze 245/325s on 8/11s. They will be pinched as you can see in the pic above. 9/12 is what you want at a minimum with 9.5/12.5 being ideal. You always want to run the widest wheel possible per given tire width in order to stiffen the sidewall, increase grip, and improve steering response. I just switched from 9.5/12.5s to 10/13s and it definitely sharpens up the steering response and feel at the limit. On a tail heavy car like a 911 where you have a ton of load going through the rear wheels, you really want the rear tires to fit square on the rim, or better yet with a small amount of stretch. On the RSR, Porsche runs 310s on 14" wheels..
Last edited by pwdrhound; Sep 13, 2016 at 10:02 AM.
For road course duty use I would not squeeze 245/325s on 8/11s. They will be pinched as you can see in the pic above. 9/12 is what you want at a minimum with 9.5/12.5 being ideal. You always want to run the widest wheel possible per given tire width in order to stiffen the sidewall, increase grip, and improve steering response. I just switched from 9.5/12.5s to 10/13s and it definitely sharpens up the steering response and feel at the limit. On a tail heavy car like a 911 where you have a ton of load going through the rear wheels, you really want the rear tires to fit square on the rim, or better yet with a small amount of stretch. On the RSR, Porsche runs 310s on 14" wheels..
I remember when I started this thread quite some time ago...what your saying here is 100% accurate...I bought my car from a out of state friend so I knew I was getting a good car but the guy was a oem junkie...the p zeros on the car sucked and at that point I thought the more rubber the better....well folks I'm glad I put on the pss and stuck with 235/305 combo because in true meaning the car doesn't need it...this width launches so hard and grips so hard I think I'm going to snap something...and for track road use...when your really digging into a turn I feel anything wider and the tire would fly off the rim....these tires sizes are perfect for this car....
Now if you upgrade rims...that's a different story...
I remember when I started this thread quite some time ago...what your saying here is 100% accurate...I bought my car from a out of state friend so I knew I was getting a good car but the guy was a oem junkie...the p zeros on the car sucked and at that point I thought the more rubber the better....well folks I'm glad I put on the pss and stuck with 235/305 combo because in true meaning the car doesn't need it...this width launches so hard and grips so hard I think I'm going to snap something...and for track road use...when your really digging into a turn I feel anything wider and the tire would fly off the rim....these tires sizes are perfect for this car.... Now if you upgrade rims...that's a different story...
For road course duty use I would not squeeze 245/325s on 8/11s. They will be pinched as you can see in the pic above. 9/12 is what you want at a minimum with 9.5/12.5 being ideal. You always want to run the widest wheel possible per given tire width in order to stiffen the sidewall, increase grip, and improve steering response. I just switched from 9.5/12.5s to 10/13s and it definitely sharpens up the steering response and feel at the limit. On a tail heavy car like a 911 where you have a ton of load going through the rear wheels, you really want the rear tires to fit square on the rim, or better yet with a small amount of stretch. On the RSR, Porsche runs 310s on 14" wheels..
This I 100% agree with!! I would never put on 325's on a 11" rim... that's just dumb. You can say it's acceptable for street use, but honestly for street use you will not be at the limit of adhesion on 305's anyway.
This I 100% agree with!! I would never put on 325's on a 11" rim... that's just dumb. You can say it's acceptable for street use, but honestly for street use you will not be at the limit of adhesion on 305's anyway.
I like to power slide down a merging dead end street...actually learned how to power slid sideways on that road...I hook 1st and second...car just digs the road....to be honest there so much grip that I had to learn how to launch the car different...I don't just rev the car and dump...I actually get better times actually riding the clutch just a bit for a few feet then floor the gas...better for the car and faster...what tires are you on...
resurrecting this oldie but goodie.
soooo... what I'm able to understand by comments shared here and other threads I've researched...
on stock 997tt CL wheels (which are 8.5" and 11"), many prefer 245/305 and is even mathematically closer to the oem ratio.
however 245/325 fits/works just as fine even if the ratio is only marginally greater - but no discernible difference. and actually fills out the wells visually nicer (I'm on stock springs) than 245/305.
Don't blame me for resurrecting this thread, but I put 245/325 Pilot Sport 4S tires on my car a couple of years ago, love these tires BTW. As you can see I have 19" CL's so no chance to add spacers. As a result with stock height as I have the tire sidewall looks a little small. I don't want to over promise here as the difference is slight, but the wheel/tire combo looks a little more robust and fits the opening better.
the opening better.
resurrecting this oldie but goodie.
soooo... what I'm able to understand by comments shared here and other threads I've researched...
on stock 997tt CL wheels (which are 8.5" and 11"), many prefer 245/305 and is even mathematically closer to the oem ratio.
however 245/325 fits/works just as fine even if the ratio is only marginally greater - but no discernible difference. and actually fills out the wells visually nicer (I'm on stock springs) than 245/305.
Don't blame me for resurrecting this thread, but I put 245/325 Pilot Sport 4S tires on my car a couple of years ago, love these tires BTW. As you can see I have 19" CL's so no chance to add spacers. As a result with stock height as I have the tire sidewall looks a little small. I don't want to over promise here as the difference is slight, but the wheel/tire combo looks a little more robust and fits the opening better.
well done!👍
Last edited by tonupbklyn; Oct 18, 2020 at 10:32 PM.
