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The percentage difference is 1.75%
The circumference increase is +1.8%
"The original factory wheel sizes were 6JX16 on the front and 8JX16 on the rear. The original standard tyres were 205/55ZR16s on the front and 225/50ZR16s on the rear."
Atta boy. Your rear tires are too big, your going to break your car and your speedo is off! More than Sparky's I might add. LMAO!
My change (along with almost everyone here that runs 10J with a 265) is tiny as I have correctly pointed out. Sparky's percentage change is much much bigger as my aspect ratio illustration clearly shows.
Carrera CUP 964 ran:
• 1992 onwards 8x18" front and 9.5x18" rear three-piece "Speedline for Porsche" wheels. Their tyre sizes were 225/ 40 and 265/ 35 respectively.
Hang on a sec. You just posted an incorrect stock rear wheel size and thus posted an incorrect % change. And you're not even going to admit it? I'm sorry fella, but you've just lost all credibility.
Last edited by BLACK-BETTY; 01-29-2015 at 09:22 PM.
For those interested, tire damage like that of Sparky's Contis, happens due to low pressure. When a tire is run with low pressure, a dead giveaway is the lettering being rubbed off due to abrasion of the road. Not only that, but because the tire had low pressure, the failure in the sidewall is cyclical and often referred to as a "heat ring", where the inside walls are essentially pinched and rub against each other and the cords fail in the manner pictured.
Source? Previous management position at NTB.
Literally has nothing to do with tire stretching.... at all. Sparky probably had a slow leak he didn't realize.
265 is the wrong tire size and your speedo is off more than Sparky's. FELLA.
He just wont get it that hes wrong. And that a 235 on a 9 is within specs with every tire manufacture out there and has no stretch.I find it funny that he goes on and on and on. Must have a super boring life.
Originally Posted by BHCfarkas
Sparky probably had a slow leak he didn't realize.
Who knows I changed lanes hit a reflector and pop. Most of the tire damage was caused because I had to drive over 2 mile on just the rim. As the oem air compressor didnt work to pump the spare up. The tire wasnt split when I finally came to a rest on the side of the highway. Only when I got to a gas station.It was 4am I just wanted to go home.
For those interested, tire damage like that of Sparky's Contis, happens due to low pressure. When a tire is run with low pressure, a dead giveaway is the lettering being rubbed off due to abrasion of the road. Not only that, but because the tire had low pressure, the failure in the sidewall is cyclical and often referred to as a "heat ring", where the inside walls are essentially pinched and rub against each other and the cords fail in the manner pictured.
Source? Previous management position at NTB.
Literally has nothing to do with tire stretching.... at all. Sparky probably had a slow leak he didn't realize.
As I mentioned just after Frank BB brought this up a few pages back.
As I said in black and white - I posted a question asking if it were stretch related, I didn't once state it was and then separately I proved there is a stretch.
My sincere apologies for not lauding slammed cars and questioning a stretch on a Renn forum - lol. But ofcourse do carry on.
Last edited by BLACK-BETTY; 01-30-2015 at 12:52 PM.
Right so you are saying that my 235/35 on a 9 is stretch. So to you the diameter is smaller becuase of the stretch. So that means it would be closer to oem spec. As a 235/35 is taller than a oem spec wheel and tire combo.
How do you figure? A 235/35/18 on 9" rim would give you a rolling dia depending on actual tire spec of 24.4" or 3.2" side wall vs stock 255/40/17 on 9" rim dia is 25" or 4"sidewall. IIRC when I looked at the Continental Extreme contact in that size I crossed it off my list because it was actually rated for a maximum of 9" and had a smaller dia of 24.2" way to small per Porsche. I run a 295/30/18 on a 10 with perfect 25" dia and that is only a 3.5" sidewall which I have had tire damage due to too small a sidewall. I would not consider this the fault of tire just a hazard of driving tire setups like this on anything but perfect roads.
For the record a 235/40/18 mounted on 9" would have a dia of 25.4" and a sidewall of 3.7"
I hate to say it but I have to agree with BHCfarkas and I have no doubt the tire deflated he had a slow leak or cracked rim. But I have seen this way too many times when a sidewall is too small and a risk you take by using sizes not approved by Porsche. I would agree it has nothing to do with stretching which is another topic with similar issues.
01-29-2015, 08:38 PM
