Nitto 555R-II
Thread Starter
Melting Slicks
Joined: Sep 2006
Posts: 2,728
Likes: 142
From: Iowa
Nitto 555R-II
Just replaced the tires on my Supercharged 01Z. Went with another set of 555R-II's. The fronts are still good, but the rears had the centers worn completely smooth. I need to change the pressures I run at this season. Here are some photos of the tires.
I was running 32lbs of pressure in these tires, which I thought would have been ok...but apparently it was too much. I'll probably end up contacting Nitto, but what do you guys run in your 555's? Running around with these tires at 26psi just sounds too low, but seems like what they need. I use this car on the street as well as dragracing, autocross, and road racing. Obviously, I don't mind changing pressures for each event. Autocross is easy enough to figure out, but what about the street, drag, and road racing?
edit: On 2nd thought, the better place for this is in the Autocross/Road Racing section. Please move this.
I was running 32lbs of pressure in these tires, which I thought would have been ok...but apparently it was too much. I'll probably end up contacting Nitto, but what do you guys run in your 555's? Running around with these tires at 26psi just sounds too low, but seems like what they need. I use this car on the street as well as dragracing, autocross, and road racing. Obviously, I don't mind changing pressures for each event. Autocross is easy enough to figure out, but what about the street, drag, and road racing?
edit: On 2nd thought, the better place for this is in the Autocross/Road Racing section. Please move this.
Last edited by Quickshift_C5; Mar 10, 2013 at 11:57 AM.
Thread Starter
Melting Slicks
Joined: Sep 2006
Posts: 2,728
Likes: 142
From: Iowa
Does anyone know how much undertread these tires have? I was thinking of keeping the old tires and using them for drag racing.
Thread Starter
Melting Slicks
Joined: Sep 2006
Posts: 2,728
Likes: 142
From: Iowa
Drifting
Joined: Oct 2003
Posts: 1,923
Likes: 5
From: San Antonio TX
to test your contact patch, with the tires warmed up take a grease pen and draw a line across the tread then drive straight a short distance (20 feet) on a level parking lot (concrete works best) then look at what is worn off that will tell you if the pressure is to high or to low.
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Melting Slicks
Joined: Apr 2004
Posts: 2,301
Likes: 199
From: Valencia CA
Pick up a tire temp gauge from Intercomp or Longacre and then dial them in for each type of racing. 
I prefer the gauge with an actual probe to stick into the tire, rather than the non-contact version.
I prefer the gauge with an actual probe to stick into the tire, rather than the non-contact version.
Drifting
Joined: Feb 2010
Posts: 1,310
Likes: 99
From: Arlington Texas
I ran mine around 28 and had alot of center wear. I lowered them to 20 and they hooked even better. They did feel a little squishy cornering that low but was really good for roll racing. I wasnt aware they quit making them but I also switched to Mickey Thompson because I needed more traction.
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
I run 24-25 psi and get pretty even wear on them....Sure the center is SLIGHTLY more worn then the outsides but not anywhere near as bad as yours... But if i know i am gonna hit some twisties, I'll air em back up to 30 psi for stability...then back down to 25 psi for normal driving... 17 psi for some drag action.