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Old 11-30-2017, 07:19 AM   #1
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Tire Size

So i am looking at getting new tires for track use only - interested in the toyo R888r and currently have 18X9 rear wheels. It looks like 265's are hard to come by, can i get away with 275's in the rear.

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Old 11-30-2017, 08:12 AM   #2
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Originally Posted by Medsurf View Post
So i am looking at getting new tires for track use only - interested in the toyo R888r and currently have 18X9 rear wheels. It looks like 265's are hard to come by, can i get away with 275's in the rear.
I know some folks that are running 235/40/18 front and 275/35/18 in the back in the R888R - the diameters are only slightly larger than the OEM sizes - this weekend they are running their first track day in that tire, if you wait until Saturday evening I can report back and let you know how they were.
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Old 11-30-2017, 09:33 AM   #3
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thanks, will keep a look out. hope they work out okay
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Old 11-30-2017, 02:07 PM   #4
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I will be buying tires in the spring and 275's in the rear would be nice.
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Old 12-02-2017, 09:39 AM   #5
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Not trying to insult anyone but taller tires means less acceleration
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Old 12-02-2017, 10:02 AM   #6
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wheel tire combination impacts performance in different ways:
increased wheel size with decreased tire height but increased width increases traction but decreases mileage but not performance up until 19s so stay within 17 - 18s wheel size with appropriate height/width and you'll see increased aesthetics and performance gains.
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Old 12-02-2017, 07:48 PM   #7
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The 275/35/18 didn't work this weekend, they rubbed, maybe due to wheel offset issues. I don't have any more details than that, but wanted to give a quick follow up.

Edit: it was offset issues with a 10" rear wheel, issue resolved going to a different wheel.

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Old 12-02-2017, 08:51 PM   #8
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The 275/35/18 didn't work this weekend, they rubbed, maybe due to wheel offset issues. I don't have any more details than that, but wanted to give a quick follow up.
I have 265/35/18 on turbo twist wheels
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Old 12-03-2017, 03:27 AM   #9
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I've seen people with 997 turbo wheels in 19" and others with 996 turbo wheels in 18". I have a second set with 993 turbo hollow spoke with r-compound that i use on my turbo. Have been thinking if they work on the Boxster. The turbo uses 285/30 - 18 tires.

If it works with the above cars maybe it's better to buy wheels that work and matchning tires.
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Old 12-03-2017, 07:16 AM   #10
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Quote:
Originally Posted by steved0x View Post
I know some folks that are running 235/40/18 front and 275/35/18 in the back in the R888R - the diameters are only slightly larger than the OEM sizes - this weekend they are running their first track day in that tire, if you wait until Saturday evening I can report back and let you know how they were.
What he said. There seems to be two ways the tire manufacturer make their brand 225/40/18 and 265/35/18, or 235/40/18 and 275/35/18. either go on 8" front and 9" rear. I do use a 17MM shim on the front and a 7MM shim.
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Old 12-03-2017, 03:06 PM   #11
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Seems to me that that the wheel-size.com calculator will answer a lot of questions.

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