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C6 Corvette ZR1 & Z06General info about GM’s Corvette Supercar, LS9 Corvette Technical Info, Performance Upgrades, Suspension Setup for Street or Track
What are you higher HP Zr1 guys running on the rear .I am wanting to stay with the factory 20x12 and wanting a drag radial . I am putting down 700 rwhp
You know, a good drag radial used for drag racing needs some sidewall (the more sidewall, the better)... Any tire that fits on a 20" wheel is not going to have hardly any sidewall at all (20 - 25 aspect ratio) = no flex.
Tires that resemble a rubber band on the wheel just don't work well for drag racing.
That's just the way it is.
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See how this tire flexes ...
Fat sidewall ... You won't get this with a 20" wheel ... These wheels are more than likely 17" diameter with a 45 aspect ratio drag radial (305/45-17)
You know, a good drag radial used for drag racing needs some sidewall (the more sidewall, the better)... Any tire that fits on a 20" wheel is not going to have hardly any sidewall at all (20 - 25 aspect ratio) = no flex.
Tires that resemble a rubber band on the wheel just don't work well for drag racing.
That's just the way it is.
____________________________________
See how this tire flexes ...
Fat sidewall ... You won't get this with a 20" wheel ... These wheels are more than likely 17" diameter with a 45 aspect ratio drag radial (305/45-17)
That's how you get quick 60' times.
I have a drag set up and thats not what the question was im looking for a street tire !!
I am at ~805 whp and I run Cup 2's on the 20" rears. I only drive my ZR1 about 1,000 miles a year so I get about 3 years out of them then buy new ones.
2020 Corvette of the Year Finalist (performance mods)
C4 of Year Winner (performance mods) 2019
If you have stock ZR1 wheels you could do what I did and find a set of reproduction (used as they aren't sold new anymore) 19x12" ZR1 wheels for the rear, and then run 345/30R19 tires on them. I use Toyo R888R, but there are several other options as well (Toyo RR, Nitto DRs, M/T, etc). Personally, I run this set up around town, and then keep Michelin ZPs on the stock 20" rears and put those on when doing road trips. The R888R on my 19" wheels do reasonable well of hooking up 700whp (what I make on E85, which is what I run around town, for trips I switch to 93 and drop it down to about 640whp). The 345/30R19 is only a 1/2" taller than stock, so it doesn't throw the speedo off much and doesn't screw with TCS/AH.
If you are set on running sticky tires on the factory 20s, there's not a whole lot of choice. Toyo makes the R888R and RR in a 325/30R20 which is a full 1" taller than stock, and will throw the speedo off a little more, but should fit ok if you're at stock ride height (I've run that height tire previously on a GS with no issues).
I am at ~805 whp and I run Cup 2's on the 20" rears. I only drive my ZR1 about 1,000 miles a year so I get about 3 years out of them then buy new ones.
How well do they stick on acceleration? Do they seem to hook better than the regular pilot super sport?
It says nothing in my initial post about wanting a drag set up or used for drag racing. I want a drag radial for better traction on the street . And that is what my post states !
I have a very nice set of chrome 18/19 repops I'd sell for cheap if anyone is looking for a set with 10k miles on them. I'm running cup 2s on my 19/20 setup and in stock size 335s they are as good as it gets....
It says nothing in my initial post about wanting a drag set up or used for drag racing. I want a drag radial for better traction on the street . And that is what my post states !
Where does your initial post say anything about the street?
Plus your question has only been asked ten times in the past 6 months, a simple search would have answered your question
I ditched the Michelins, they suck, I run 20" wheels also and use the Pirelli P-Zero tire, they are the best street tire I found that fit the 20" wheel, I run 345's on rear. A lot better traction than Michelins but they do cost more. Good luck on your search.
Originally Posted by 2quick98
What are you higher HP Zr1 guys running on the rear .I am wanting to stay with the factory 20x12 and wanting a drag radial . I am putting down 700 rwhp
If you have stock ZR1 wheels you could do what I did and find a set of reproduction (used as they aren't sold new anymore) 19x12" ZR1 wheels for the rear, and then run 345/30R19 tires on them. I use Toyo R888R, but there are several other options as well (Toyo RR, Nitto DRs, M/T, etc). Personally, I run this set up around town, and then keep Michelin ZPs on the stock 20" rears and put those on when doing road trips. The R888R on my 19" wheels do reasonable well of hooking up 700whp (what I make on E85, which is what I run around town, for trips I switch to 93 and drop it down to about 640whp). The 345/30R19 is only a 1/2" taller than stock, so it doesn't throw the speedo off much and doesn't screw with TCS/AH.
If you are set on running sticky tires on the factory 20s, there's not a whole lot of choice. Toyo makes the R888R and RR in a 325/30R20 which is a full 1" taller than stock, and will throw the speedo off a little more, but should fit ok if you're at stock ride height (I've run that height tire previously on a GS with no issues).
you notice a big difference between 19s and 20s in back? Im similar hp and have 20s out back and trying to find best tire for the street as well
2020 Corvette of the Year Finalist (performance mods)
C4 of Year Winner (performance mods) 2019
Originally Posted by CorvetteGuy87
you notice a big difference between 19s and 20s in back? Im similar hp and have 20s out back and trying to find best tire for the street as well
Keep in mind that when running the 20" rears with Michelin ZPs I'm almost always on 93 octane and about 640whp, while when running the 19" rears with R888R I'm almost always running E85 at 700whp. With that said, yes, there's a noticeable difference in multiple areas. Straight-line traction on the 19/R888R combo is definitely better, but so is lateral grip (to be expected as the R888R is a track tire masquerading as a street tire). What's interesting is that the 19/R888R combo rides noticeably better than the 20/Michelin combo. Part of that is probably due to the stiff sidewalls of the ZP tires, but the R888R is a competition tire with a very stiff sidewall as well, so obviously, the 1" smaller diameter wheel does make a difference. For noise, it's basically a wash between the two. The R888R does get somewhat loud after it's broken in, but it's really not bad, and honestly I'd probably give it the win over the Michelins which can be either quiet or noisy depending on pavement type. Where the 20/Michelin combo wins is the ability to handle rain (especially as they are almost full tread depth) and the comfort of knowing I won't be stranded in the back of beyond. Unlike some, I have had loss of pressure on rural backroads where there wasn't any cell service and there was no safe place to pull over (backside of Tail of the Dragon in rural NC for one). It's very nice to be able to drive safely to a town where there is cell service, tire store, and a hotel (because you're probably going to be waiting at least a day for a replacement tire in our sizes). Finally looks, it honestly hard to tell the difference in rear wheel size at a glance, although car guys will tend to notice the "meatier" look of the R888R.
Here's a couple of pics, one on 19"/R888R and the other on 20"/Michelin:
Keep in mind that when running the 20" rears with Michelin ZPs I'm almost always on 93 octane and about 640whp, while when running the 19" rears with R888R I'm almost always running E85 at 700whp. With that said, yes, there's a noticeable difference in multiple areas. Straight-line traction on the 19/R888R combo is definitely better, but so is lateral grip (to be expected as the R888R is a track tire masquerading as a street tire). What's interesting is that the 19/R888R combo rides noticeably better than the 20/Michelin combo. Part of that is probably due to the stiff sidewalls of the ZP tires, but the R888R is a competition tire with a very stiff sidewall as well, so obviously, the 1" smaller diameter wheel does make a difference. For noise, it's basically a wash between the two. The R888R does get somewhat loud after it's broken in, but it's really not bad, and honestly I'd probably give it the win over the Michelins which can be either quiet or noisy depending on pavement type. Where the 20/Michelin combo wins is the ability to handle rain (especially as they are almost full tread depth) and the comfort of knowing I won't be stranded in the back of beyond. Unlike some, I have had loss of pressure on rural backroads where there wasn't any cell service and there was no safe place to pull over (backside of Tail of the Dragon in rural NC for one). It's very nice to be able to drive safely to a town where there is cell service, tire store, and a hotel (because you're probably going to be waiting at least a day for a replacement tire in our sizes). Finally looks, it honestly hard to tell the difference in rear wheel size at a glance, although car guys will tend to notice the "meatier" look of the R888R.
Here's a couple of pics, one on 19"/R888R and the other on 20"/Michelin:
05-03-2022, 07:25 PM
Best Drag Radial for a 20''
I'm running cup 2s on my 19/20 setup and in stock size 335s they are as good as it gets....
