993 tire size for 18" wheels
#16
Once again, o/s(ET) is critical, as is the specifics of the tire, where the rub is would also be useful, it's not always gonna rub at the top and lip pictures are nic but #s are more meaningful
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presto713 (05-12-2022)
#20
One thing I have learned about these tire size threads is that it is important is to get the actual tire width, in inches, vs relying on someone saying a 285 "worked for them". A 285 from one manufacturer may be exactly as wide as a 275 from another. Others are describing their experience with their particular brand in an effort to be helpful, which is what makes this board great.
section width varies w/ wheel width adding ~.2 " for each .5" of additional wheel width.
there is somewhat more variation in the shoulder profile and tread width which varies from 10.1" to 10.7"
#21
not likely
first, the narrowest wheel for a 265/35 is a 9
second , the 265/35 front space even if it was mounted on an 8 is still a full 10mm more than even a 245/35 which is already very tight
I was just looking at an Andial motor RSR chassis yesterday and even w/ the RSR 9s and the wide fenders the 265/35 fronts were still very tight.
first, the narrowest wheel for a 265/35 is a 9
second , the 265/35 front space even if it was mounted on an 8 is still a full 10mm more than even a 245/35 which is already very tight
I was just looking at an Andial motor RSR chassis yesterday and even w/ the RSR 9s and the wide fenders the 265/35 fronts were still very tight.
#22
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not likely
first, the narrowest wheel for a 265/35 is a 9
second , the 265/35 front space even if it was mounted on an 8 is still a full 10mm more than even a 245/35 which is already very tight
I was just looking at an Andial motor RSR chassis yesterday and even w/ the RSR 9s and the wide fenders the 265/35 fronts were still very tight.
first, the narrowest wheel for a 265/35 is a 9
second , the 265/35 front space even if it was mounted on an 8 is still a full 10mm more than even a 245/35 which is already very tight
I was just looking at an Andial motor RSR chassis yesterday and even w/ the RSR 9s and the wide fenders the 265/35 fronts were still very tight.
I have a few of sets of Yokohama tires left over from Pikes Peak. The 265/18 fronts might make decent rears for my 993 C2 on 18" RS Speedlines.
However the rears are 295/30/18. I Would like to use them on the rear of my 993 C4S and my 964 turbo RH wheels. Would that be sufficient?
I would then have to buy new Yokohama fronts to complement them of course. They offer 225/40/18, 235/40/18 and 245/40/18.
What would make the best size for the front of my C4S and 964 turbo?
#24
Rennlist Member
Any advantage to going a little wider than stock NB 18” sizes for a street car that’s going to be driven on the backroads? No track duty. Or should I stick with the stock sizes for street/backroad driving?
#26
Burning Brakes
Interesting. What's the reasoning behind narrower tires for backroad fun? So then why does Singer go wider?
#28
Narrower tires lowers the performance threshold of the car. A well set-up 993 on wide tires is so capable that you can't get near the limit in street driving, even backroads driving. I have an early 911, a 993, and a 991S, and the early car is simply the most fun of the three for aggressive street driving. It's on 195's. The 991 you can barely get a squeak out of the tires. I hate to say it, but it's uninvolved and a little boring as a fun run car. The thing does the 'ring in the 7:30's. You're not going anywhere near its performance limit on the street.
#29
Instructor
Narrower tires lowers the performance threshold of the car. A well set-up 993 on wide tires is so capable that you can't get near the limit in street driving, even backroads driving. I have an early 911, a 993, and a 991S, and the early car is simply the most fun of the three for aggressive street driving. It's on 195's. The 991 you can barely get a squeak out of the tires. I hate to say it, but it's uninvolved and a little boring as a fun run car. The thing does the 'ring in the 7:30's. You're not going anywhere near its performance limit on the street.
About tires - on the 993, I've only ever had wide tires in the back on stock 18" wheels - 285/30. The car also has spacers from s-car-go, and the wide tires look really nice. I wonder if the car will drive better with narrower spec tires in the rear like 265/35, since wider tires can have a wandering contact patch at lower psi. And of course I can go from Pilot Sport to Pilot Sport 4S in the smaller size
Has anyone gone from 285/30 to 265/35?
#30
Rennlist Member
Old thread but since it got bumped I'll offer some input.
Pay attention to tire heights as well as widths. With AWD you can use this to help dial in more RWD tendencies by matching front to rear tire height. The stock 993 runs a smaller rear tire to heat up vicious coupling. That heat/preload is what helps transmit power to front wheels. I want to experiment with taller rears to see if I can dial in even more RWD bias. 2WD guys are not off the hook either since antilock brakes sense the difference in speed and intervene sooner if tire sizes are mismatched. Not a big consideration in street usage but something to think about.
As you deviate from factory stagger setup needs to be adjusted as well. If you have adjustable coilovers and sways getting balance back is easy. If your hands are tied don't sway to far from stock.
Matching the tire width to the proper rim size is paramount! Stuffing a big tire on a narrow wheel creates vague steering feel, poor tire wear and terrible breakaway personality at the limit. Strongly consider what's important to you before oversizing tires. On the opposite end I run 245's on a 10" rim with my track car. I started with 9"s. At the limit the 10"s breakaway cleanly. The 9"s loaded up sidewall tension and had strange breakaway personalities that made it harder to drive on the edge. Back to my 993, I run 235's in 9" front and 315's on 12" rear.
Narrow down tire selection as you consider different sizes. I would be happier with a tire I loved in a smaller size than something else just to get a size I wanted. I keep coming back to Michelin PS2's for the street. Nothing else has given me the same blend of ride quality and performance.
Pay attention to tire heights as well as widths. With AWD you can use this to help dial in more RWD tendencies by matching front to rear tire height. The stock 993 runs a smaller rear tire to heat up vicious coupling. That heat/preload is what helps transmit power to front wheels. I want to experiment with taller rears to see if I can dial in even more RWD bias. 2WD guys are not off the hook either since antilock brakes sense the difference in speed and intervene sooner if tire sizes are mismatched. Not a big consideration in street usage but something to think about.
As you deviate from factory stagger setup needs to be adjusted as well. If you have adjustable coilovers and sways getting balance back is easy. If your hands are tied don't sway to far from stock.
Matching the tire width to the proper rim size is paramount! Stuffing a big tire on a narrow wheel creates vague steering feel, poor tire wear and terrible breakaway personality at the limit. Strongly consider what's important to you before oversizing tires. On the opposite end I run 245's on a 10" rim with my track car. I started with 9"s. At the limit the 10"s breakaway cleanly. The 9"s loaded up sidewall tension and had strange breakaway personalities that made it harder to drive on the edge. Back to my 993, I run 235's in 9" front and 315's on 12" rear.
Narrow down tire selection as you consider different sizes. I would be happier with a tire I loved in a smaller size than something else just to get a size I wanted. I keep coming back to Michelin PS2's for the street. Nothing else has given me the same blend of ride quality and performance.