Who runs Toyo R888's in the back and ??? upfront?
04-27-2010, 06:46 PM
#21
Safety Car
No, I am the guy that, instead of listening blindly to what other people say, called up Toyo and Nitto and got their official word on heat cycling these tires 
What was your contribution again?
Now, for your information.
STOCK C6 Front, 245/40R18:
25.71 overall dia, 809.0Revs/Mile.
Your front tire: 255/35R18:
25.02 overall dia, 831.3Revs/Mile = 2.7% Smaller than stock
My front tire: 265/35R18:
25.30 overall dia, 822.1Revs/Mile. = 1.6% Smaller than stock
STOCK C6 Rear:
285/35R19:
26.85 overall dia, 774.6Revs/Mile
Your rear tire: 295/30R19:
25.96 overall dia, 801.2Revs/Mile = 3.32% = TOO SMALL
My rear tire: 305/35R18:
26.40 overall dia, 787.8Revs/Mile = 1.6% Smaller than stock
So, like I said, you are further away from GM's recommendations than I. I love how you come saying you "I just don't understand why people ignore both Toyo and GM's recommendations for the proper size.", when in reality you don't even seem to understand tire sizes, since you are running a tire on the back that is over a full inch smaller than what GM recommended... Bravo!
By the way, if you were running a 305/30R19 like all the guys at your local car meet with cars that confuse you with their wide tires, you'd only be off by 2.4% instead of 3.32%. Anything over 3% is NOT recommended 
And, while we're on the subject, 32PSI is a bit too much; you have a higher load rating on the tire but no added load; you can let off a little air and get a better contact patch. I run 30PSI on the street and 25PSI on the track.
Isn't it amazing what you can learn when you actually look this up for yourself? Learn more at the Tire Size Calculator.
Tell Charlie I said hi. He tuned my car the first time around; GREAT guy
What was your contribution again?Now, for your information.
STOCK C6 Front, 245/40R18:
25.71 overall dia, 809.0Revs/Mile.
Your front tire: 255/35R18:
25.02 overall dia, 831.3Revs/Mile = 2.7% Smaller than stock
My front tire: 265/35R18:
25.30 overall dia, 822.1Revs/Mile. = 1.6% Smaller than stock
STOCK C6 Rear:
285/35R19:
26.85 overall dia, 774.6Revs/Mile
Your rear tire: 295/30R19:
25.96 overall dia, 801.2Revs/Mile = 3.32% = TOO SMALL
My rear tire: 305/35R18:
26.40 overall dia, 787.8Revs/Mile = 1.6% Smaller than stock
So, like I said, you are further away from GM's recommendations than I. I love how you come saying you "I just don't understand why people ignore both Toyo and GM's recommendations for the proper size.", when in reality you don't even seem to understand tire sizes, since you are running a tire on the back that is over a full inch smaller than what GM recommended... Bravo!
By the way, if you were running a 305/30R19 like all the guys at your local car meet with cars that confuse you with their wide tires, you'd only be off by 2.4% instead of 3.32%. Anything over 3% is NOT recommended And, while we're on the subject, 32PSI is a bit too much; you have a higher load rating on the tire but no added load; you can let off a little air and get a better contact patch. I run 30PSI on the street and 25PSI on the track.Isn't it amazing what you can learn when you actually look this up for yourself?
Learn more at the Tire Size Calculator.Tell Charlie I said hi. He tuned my car the first time around; GREAT guy
04-27-2010, 07:57 PM
#22
Instructor
Member Since: Nov 2009
Location: Valencia CA
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http://toyotires.com/tire/pattern/proxes-r888
Toyo's recommendation on here for the stock rear 19x10 inch wheel is to go with the 295/30/19. If you notice, the 305/30/19 is recommended for a 10.5 to 11.5 inch wide wheel.
Toyo's recommendation on here for the stock rear 19x10 inch wheel is to go with the 295/30/19. If you notice, the 305/30/19 is recommended for a 10.5 to 11.5 inch wide wheel.
04-27-2010, 10:41 PM
#24
Race Director
Member Since: Nov 2000
Location: CA
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2017 C5 of the Year Finalist
St. Jude Donor '08
For those that like straight line only, the oversize 305 may suit them ok, but I get all the traction I need out of my 295s on the street once they get just a bit of heat in them, and I now have 501 at the wheel.
04-28-2010, 12:01 AM
#26
Instructor
Member Since: Nov 2009
Location: Valencia CA
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My bad PowerLabs....
I just checked my tires in my garage tonight when I got home and I went with the stock size on my Toyos...245/40/R18. I was posting from work and don't drive the Corvette everyday.
On the rear, for my 19 inch rim, I used the Toyo recommended size 295 for a 10 inch wide rim. I noticed you went with 18's on the rear on your car? 305 is the Toyo recommended size. I still understand that because of my shorter side wall I'll need to get the computer reprogrammed.
I just checked my tires in my garage tonight when I got home and I went with the stock size on my Toyos...245/40/R18. I was posting from work and don't drive the Corvette everyday.
On the rear, for my 19 inch rim, I used the Toyo recommended size 295 for a 10 inch wide rim. I noticed you went with 18's on the rear on your car? 305 is the Toyo recommended size. I still understand that because of my shorter side wall I'll need to get the computer reprogrammed.
05-03-2010, 12:30 PM
#27
Racer
Thread Starter
PowerLabs - any idea what kind of mileage you'll get the with R1R's?
I'm leaning towards the T1R's, since the tread rating is higher...unless someone is yelling and screaming not to get those.
Front tires only remember, R888's outback
I'm leaning towards the T1R's, since the tread rating is higher...unless someone is yelling and screaming not to get those.
Front tires only remember, R888's outback
04-18-2019, 08:33 PM
#28
Pro
I got the R888R rears in 345/30R19 on my C7 Z06, and bought the new Toyo Sports fronts in 285/30R19. I still have my original tires and wheels as they only had 5k miles on them. The R888R didn’t work well when I took the car over 100 with my MPSS ZP on front. The backend would shift or wag and at that speed you do t want to feel that.
I later read that run flats in front with R888R is the back causes the wagging. I surmise it has to do with the fact that run flats have wildly different construction and start to behave very different that non run flats at higher speeds. I will have the new Toyo Sports in 3 days so we will test it out. Planning run pressures at around 30-32 psi cold.
I later read that run flats in front with R888R is the back causes the wagging. I surmise it has to do with the fact that run flats have wildly different construction and start to behave very different that non run flats at higher speeds. I will have the new Toyo Sports in 3 days so we will test it out. Planning run pressures at around 30-32 psi cold.
Last edited by 2FAST4U; 04-18-2019 at 08:35 PM. Reason: TYpo
04-19-2019, 07:50 AM
#29
I can't answer your whole question as I only have the Toyo R888R's in the back, 325-30-20s with Continental extremecontacts in the front. I run them 32 psi cold and have had them up to 170 mph in the half mile with no stability problems whatsoever. They also do double duty as canyon Carver's, that's a win, win for me.
Traction is also incredible while first gear on an unprepped surface will never grab, with heat in the tires 2nd gear full throttle no spinning. That's huge improvement from Conti's or PS 2s spinning through 3rd.
Traction is also incredible while first gear on an unprepped surface will never grab, with heat in the tires 2nd gear full throttle no spinning. That's huge improvement from Conti's or PS 2s spinning through 3rd.
