what profile tyre do you run
09-05-2018, 06:47 PM
#1
what profile tyre do you run
i have 18 inch speedlines running 225 40 18 up front and 265 35 18 can i go for a thicker profile on the rears and whats the widest i can go
Last edited by 911 2; 09-06-2018 at 01:25 PM.
09-06-2018, 09:58 AM
#3
Rennlist Member
I'm running 8" rims on the front, also with 225's. 18". Definitely still room for a wider front tire with my ET52 RH36 Alurad Speedlines.
I'm running 10" rear rims, with 285/30ZR18 on ET54 offset. To get the 285's to not lightly scrub the fender lip, I had to play around with the negative camber. I'm at - 1.6 degrees camber to eliminate the rub.
I'm also lowered to just higher than RS height. Down at RS height the rear camber was just way too much for my preference. So I had to raise the car up to gain the balance with camber.
Prior to my adjustments (back 14yrs ago when I first bought the car), it had 265's on the rear, but the car was much too high for me, AND for some reason they had about -3 degrees of camber in the rear. The tires were old crap too, and the inside tread was severely worn compared to the outside. My guess was that they did indeed have wider tires (but swapped to the older crap tread) prior to selling to me, but kept the car at a high ride height. I wanted to lower it, and thus did too many changes at once (including jumping to 285's), and thus really had to play around with adjustments to car height and negative camber to get it right.
If I had to do it all over again, I'd probably just stick with the 265's, and lower the car to my liking, along with maybe only about negative 1 degree of rear camber.
=Steve
I'm running 10" rear rims, with 285/30ZR18 on ET54 offset. To get the 285's to not lightly scrub the fender lip, I had to play around with the negative camber. I'm at - 1.6 degrees camber to eliminate the rub.
I'm also lowered to just higher than RS height. Down at RS height the rear camber was just way too much for my preference. So I had to raise the car up to gain the balance with camber.
Prior to my adjustments (back 14yrs ago when I first bought the car), it had 265's on the rear, but the car was much too high for me, AND for some reason they had about -3 degrees of camber in the rear. The tires were old crap too, and the inside tread was severely worn compared to the outside. My guess was that they did indeed have wider tires (but swapped to the older crap tread) prior to selling to me, but kept the car at a high ride height. I wanted to lower it, and thus did too many changes at once (including jumping to 285's), and thus really had to play around with adjustments to car height and negative camber to get it right.
If I had to do it all over again, I'd probably just stick with the 265's, and lower the car to my liking, along with maybe only about negative 1 degree of rear camber.
=Steve
09-06-2018, 02:58 PM
#4
Rennlist Member
My point is that you can run a lot of rubber in back with a pretty wide wheel and still run reasonable negative camber with no issues.
As for 11's, that extra 1/4 inch is outside of the wheel centerline which will force you to run some extreme negative camber to gain clearance with the quarter panel lips. I have never thought the 965 made a good "stance" car
therefore I didn't get carried away when spec-ing wider wheels.I'm also running 235-40's up front that necessitated rolled fender lips and 6mm spacers. The 235's are just a tad taller than the 225-45's that are stock.
09-06-2018, 04:26 PM
#5
Rennlist Member
probably so,... and I've often wondered why I had the problems I outlined. Could be the possibility that the Alurad RH36 rims that I have, are the older / earlier 38 bolt rims. Alurad switched to a 40 bolt pattern around the 2004 timeframe.
So maybe back in 2003 when they were building the rims I have,.. maybe the ET54 is setup just a smidge outward? ... not sure. But yea, I have to run the - 1.6 degrees of camber in the rear, with slightly HIGHER than RS height, just to achieve a no-rub situation.
How new are your RH36's?
=Steve
So maybe back in 2003 when they were building the rims I have,.. maybe the ET54 is setup just a smidge outward? ... not sure. But yea, I have to run the - 1.6 degrees of camber in the rear, with slightly HIGHER than RS height, just to achieve a no-rub situation.
How new are your RH36's?
=Steve
09-06-2018, 04:38 PM
#6
Burning Brakes
The actual tire itself may play a role in whether it rubs or not...? Different sidewall shape? Some seem rounded some seem squarish.
I run 285 35 18 Michelin super sports on the rear. Factory Speedlines. Lowered but not sure where it sits in relation to RS height. No rubbing. Just another data point.
Brandon
I run 285 35 18 Michelin super sports on the rear. Factory Speedlines. Lowered but not sure where it sits in relation to RS height. No rubbing. Just another data point.
Brandon
09-07-2018, 07:04 AM
#7
Rennlist Member
probably so,... and I've often wondered why I had the problems I outlined. Could be the possibility that the Alurad RH36 rims that I have, are the older / earlier 38 bolt rims. Alurad switched to a 40 bolt pattern around the 2004 timeframe.
So maybe back in 2003 when they were building the rims I have,.. maybe the ET54 is setup just a smidge outward? ... not sure. But yea, I have to run the - 1.6 degrees of camber in the rear, with slightly HIGHER than RS height, just to achieve a no-rub situation.
How new are your RH36's?
So maybe back in 2003 when they were building the rims I have,.. maybe the ET54 is setup just a smidge outward? ... not sure. But yea, I have to run the - 1.6 degrees of camber in the rear, with slightly HIGHER than RS height, just to achieve a no-rub situation.
How new are your RH36's?
My RH's came with the car when I bought it in 2006. Jim Dorociak polished centers and coated everything in 2008. I revised the rears with wider Speedline inner hoops in 2013 thereabout.
I've run the 295's since 2007. Started out with 285's in 2006.
The sidewalls of the 295's were fairly vertical on the 10 inch wide rears but naturally are a little more elliptically shaped on the wider wheels. I still had no interference issues with that either setup.
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09-07-2018, 08:52 AM
#8
Rennlist Member
These cars do vary from car to car and what might fit on one might not fit on another. 11's are pushing it and I am more concerned with rubbing the trailing arm than anything. I ran 235/295 for a long time but when the tires breached $500 for PS2 rears i decided it wasn't worth it so dropped back down to 285/30.
09-07-2018, 10:08 AM
#9
I currently run 225/40/18 and 285/30/18 and have had these tires for looooong time (over 12 years...sheeesh, didn't realize it as I don't drive it much) ... I am now thinking may be notching it up to 235/295 to get that fat stance..Question, would I have to go with 235 to match the 295 or stay with 225?