Toyo R888R
05-23-2017, 03:54 PM
#181
Le Mans Master
I can't really compare my set up to yours just because I have a different car, different camber, and probably different offset aftermarket wheels. In my case, it all clears except my tires rub my brake duct a it during hard corning maneuvers. It also looks just right with the top of the tire tucked in about 1/2" with some negative camber.
You are currently running 285/ 35R18s R888Rs up front correct?
Well a 275/ 35R18 R888R would be 10 mm less wide (overall so 5mm per side) and also about 3.5 mm less tall (look up exact dimensions on Toyo website). Maybe that's enough.
Then the 275/ 35 R18 in the older R888 would be narrower still.
Too top it off after that you might want to look at other tires that naturally just run more narrow.
Good luck.
Edited: Okay, just saw your photos. Just pull your tire and trim that plastic away. No reason to swap tires over that imo.
Last edited by Suns_PSD; 05-23-2017 at 03:56 PM.
05-23-2017, 03:57 PM
#182
Melting Slicks
Have your wheel turned till they rub (preferably on ramps) get a flashlight in there, and make a decision from there.
I can't really compare my set up to yours just because I have a different car, different camber, and probably different offset aftermarket wheels. In my case, it all clears except my tires rub my brake duct a it during hard corning maneuvers. It also looks just right with the top of the tire tucked in about 1/2" with some negative camber.
You are currently running 285/ 35R18s R888Rs up front correct?
Well a 275/ 35R18 R888R would be 10 mm less wide (overall so 5mm per side) and also about 3.5 mm less tall (look up exact dimensions on Toyo website). Maybe that's enough.
Then the 275/ 35 R18 in the older R888 would be narrower still.
Too top it off after that you might want to look at other tires that naturally just run more narrow.
Good luck.
I can't really compare my set up to yours just because I have a different car, different camber, and probably different offset aftermarket wheels. In my case, it all clears except my tires rub my brake duct a it during hard corning maneuvers. It also looks just right with the top of the tire tucked in about 1/2" with some negative camber.
You are currently running 285/ 35R18s R888Rs up front correct?
Well a 275/ 35R18 R888R would be 10 mm less wide (overall so 5mm per side) and also about 3.5 mm less tall (look up exact dimensions on Toyo website). Maybe that's enough.
Then the 275/ 35 R18 in the older R888 would be narrower still.
Too top it off after that you might want to look at other tires that naturally just run more narrow.
Good luck.
05-23-2017, 03:58 PM
#183
Le Mans Master
I know right!!?? 
Is that a standard C6 with a 345? What size wheel is that your running?
I’ve got a standard body C6(rear wheel 19 x 11) as well and looking to replace my Mich. Sport Cup’s with some of these R888R’s.
Making 575hp at the tire N/A is just too much for the Sport Cups.
I will say though, they were much better when I origionally put them on the car...probably got hard over the past year.
Is that a standard C6 with a 345? What size wheel is that your running?
I’ve got a standard body C6(rear wheel 19 x 11) as well and looking to replace my Mich. Sport Cup’s with some of these R888R’s.
Making 575hp at the tire N/A is just too much for the Sport Cups.
I will say though, they were much better when I origionally put them on the car...probably got hard over the past year.
Last edited by Suns_PSD; 05-23-2017 at 04:08 PM.
05-23-2017, 04:02 PM
#184
Melting Slicks
also more then the rubbing at this point it sticks out passed the top of the fender by about 1/4" and I don't know how much junk its going to toss up at the side of the car. I think at this point im def over the 295's. im thinking about the 265/30/19 r888r's. stock was 285/30/19.
05-23-2017, 04:03 PM
#185
Le Mans Master
I think that there are some regional differences in how well the local pavement hooks up and how much oil it has saturated in to it. I also think certain set ups pick up rpms much quicker off the bottom and will tend to break tires lose more easily. I mean, in the Super Chevy test on LS3 cams some years back the smallest cam made the most average power up till about 5.5K rpm. So some of these big cam set ups with high horsepower numbers might actually be a bit soft and unresponsive off the line. However, I sure would like to find out and would like my own 650 rwhp NA LS7 for testing!
It's just a guess though.
05-23-2017, 04:06 PM
#186
Le Mans Master
also more then the rubbing at this point it sticks out passed the top of the fender by about 1/4" and I don't know how much junk its going to toss up at the side of the car. I think at this point im def over the 295's. im thinking about the 265/30/19 r888r's. stock was 285/30/19.
Every tenth degree of negative camber will bring in the wheel about 1/10 of an inch. Add -.5 camber, which is nothing, and that wheel will be tucked in another 1/2" easily.
But yah, it sounds like smaller tires are the ticket in your case.
05-23-2017, 04:41 PM
#188
Le Mans Master
Um, I think that's a tiny tire compared to what you currently run.
A 10" wide wheel looks really proper with a 275/35R18 if it clears everything imo.
A 10" wide wheel looks really proper with a 275/35R18 if it clears everything imo.
05-23-2017, 05:19 PM
#190
Melting Slicks
I shine mine with hydraulic oil on the tread, looks killer for the car shows. Just kidding.
I think that there are some regional differences in how well the local pavement hooks up and how much oil it has saturated in to it. I also think certain set ups pick up rpms much quicker off the bottom and will tend to break tires lose more easily. I mean, in the Super Chevy test on LS3 cams some years back the smallest cam made the most average power up till about 5.5K rpm. So some of these big cam set ups with high horsepower numbers might actually be a bit soft and unresponsive off the line. However, I sure would like to find out and would like my own 650 rwhp NA LS7 for testing!
It's just a guess though.
I think that there are some regional differences in how well the local pavement hooks up and how much oil it has saturated in to it. I also think certain set ups pick up rpms much quicker off the bottom and will tend to break tires lose more easily. I mean, in the Super Chevy test on LS3 cams some years back the smallest cam made the most average power up till about 5.5K rpm. So some of these big cam set ups with high horsepower numbers might actually be a bit soft and unresponsive off the line. However, I sure would like to find out and would like my own 650 rwhp NA LS7 for testing!
It's just a guess though.
Last edited by Quickshift_C5; 05-23-2017 at 05:21 PM.
05-23-2017, 06:13 PM
#191
Burning Brakes
05-23-2017, 07:15 PM
#192
Le Mans Master
Don't know about all that, seems like a lot of speculation. I was able to hook at the 1/2 mile last year on a rock strewn unclean bumpy runway. You can even hear the tires spin for a very brief moment hitting bumps when wide open in 2nd gear and it still instantly grabs. You should be able to hook as long you aren't slamming your foot to the floor. Give the tires a chance to do some work.
Understand that my z51 transmission combined with my 4.10 gears makes my car accelerate like it has another hundred horsepower in the first 3 holes.
05-23-2017, 09:53 PM
#193
Melting Slicks
05-26-2017, 01:55 AM
#194
Has anybody put track days on these yet?
The old R888, in my experience, was
* Not fast on the first heat cycle
* Fast on the second heat cycle
* Fairly hard fall off after that, bad by 1/2 tread, stone dead after 2/3rds tread
* Marshmellowy when new, indifferent when old
* Hard to pin down the right tire pressures on
Wondering on what is new and what is different, if anything.
The old R888, in my experience, was
* Not fast on the first heat cycle
* Fast on the second heat cycle
* Fairly hard fall off after that, bad by 1/2 tread, stone dead after 2/3rds tread
* Marshmellowy when new, indifferent when old
* Hard to pin down the right tire pressures on
Wondering on what is new and what is different, if anything.
05-26-2017, 11:58 AM
#195
Has anybody put track days on these yet?
The old R888, in my experience, was
* Not fast on the first heat cycle
* Fast on the second heat cycle
* Fairly hard fall off after that, bad by 1/2 tread, stone dead after 2/3rds tread
* Marshmellowy when new, indifferent when old
* Hard to pin down the right tire pressures on
Wondering on what is new and what is different, if anything.
The old R888, in my experience, was
* Not fast on the first heat cycle
* Fast on the second heat cycle
* Fairly hard fall off after that, bad by 1/2 tread, stone dead after 2/3rds tread
* Marshmellowy when new, indifferent when old
* Hard to pin down the right tire pressures on
Wondering on what is new and what is different, if anything.
05-26-2017, 01:42 PM
#196
Le Mans Master
I have tracked both the R888's and the R888R's.
Both tires liked 40 psi (hot).
R888R's heat up faster, and don't get greasy like the R888's.
R888R's stick better in the turns.
Interesting note: When I was swapping wheels yesterday, I laid a mounted 295x30x18 R888R on it's side next to mounted Hankook Ventus Rs3 305x30x19. The Toyo was ~1/8" taller.
Both tires liked 40 psi (hot).
R888R's heat up faster, and don't get greasy like the R888's.
R888R's stick better in the turns.
Interesting note: When I was swapping wheels yesterday, I laid a mounted 295x30x18 R888R on it's side next to mounted Hankook Ventus Rs3 305x30x19. The Toyo was ~1/8" taller.
05-27-2017, 01:37 PM
#197
Melting Slicks
I officially hate these tires. My 295/30/19 "R's" were rubbing when everyone else running the same wheel/tire size did not have that issue. After seeing your post I blamed it on the new R's running bigger. So I ordered the older 888s and sure enough my luck sucks. Here is the mounted R to the uncounted 888. ANY IDEAS??
