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11-02-2013
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#1 |
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Join Date: Nov 2006
Location: Las Vegas, Nevada
Posts: 137
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Rear Tire's cupping
Has anybody had any trouble with Nitto NIT555 Extreme Tire's cupping just on the outermost tread, identically on both sides?
( Factory size 315/35/17 and wheels). They have about 6000 or so miles. It is just becoming noticeable. Balance was checked, Shocks , Tire pressure 35 psi, bearings tight. 
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11-02-2013
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#2 |
 Join Date: Oct 2013
Location: Colorado Springs, CO
Posts: 160
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Re: Rear Tire's cupping
My new Z has the same tires, but they've only got about 7 or 800 miles on them so I haven't seen any issues yet.
Usually cupping in the rear is an alignment issue but it could be a worn or loose suspension part. Low quality tires could amplify the problem too, but Nittos are considered pretty good. I wonder if anyone's written any similar problems in Tire Racks reviews. Chris |
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11-02-2013
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#3 | |
 
Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,141
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Re: Rear Tire's cupping
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2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" |
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11-02-2013
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#4 | |
  
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,118
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Re: Rear Tire's cupping
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director  91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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11-02-2013
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#5 |
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Join Date: Oct 2013
Location: Colorado Springs, CO
Posts: 160
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Re: Rear Tire's cupping
The Sumis aren't good tires at all....just a bad performing tire all around and, at least a few years ago, they used to use the same tread cap on the 315s as the 275, so you end up with a narrow contact patch. I had a set of rears on my '88 street/strip vette with 11" rear wheels. The only thing they have going for them is the price. I'd only consider getting them if I was getting rid of a car.
When I searched reviews, I didn't find anyone with cupping problems on them. I don't have enough miles on my set to give a comparison. I agree with Cylon in that it's probably an alignment issue if the suspension, bearings and balance are good. Chris |
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11-02-2013
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#6 |
Join Date: Jul 2005
Location: Cresson, TX
Posts: 970
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Re: Rear Tire's cupping
I just put new Nitto's on just about 50 miles ago. What a difference...
I would suspect you have a suspension alignment issue or you have some worn parts that allow the suspension to move (not as designed) for example dry rotted dog bone rubbers. I know mine are worn however I haven't had time to replace yet... I can feel the rear move when I take my foot off the gas with the clutch still engaged. Not much movement but it's there...
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Ron Hanselman Founding Member #80 CM Lifetime Member #1093 1991 #383 Twin Turbo 1993 #099 Ruby, Jeal 368 w/Snake Skinner body 1961 White with Red Int Last edited by RHanselman; 11-03-2013 at 07:26 PM. |
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11-02-2013
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#7 | |
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Join Date: May 2007
Location: Peoria, AZ
Posts: 9,118
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Re: Rear Tire's cupping
Quote:
__________________
GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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11-02-2013
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#8 |
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Join Date: Oct 2013
Location: Colorado Springs, CO
Posts: 160
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Re: Rear Tire's cupping
I know, I only mentioned it because it was mentioned. Sorry for the off topic comment.
Whenever I see odd wear patterns, my first thought is alignment as wheel bearings and suspension components give other symptoms. The rear is very susceptible to alignment issues because some shops don't even bother to align the rear, don't know how to properly align the rear on a vette (the settings can change just by rolling the vehicle), or don't want to spend the time to do it properly. C |
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11-03-2013
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#9 |
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Join Date: Nov 2006
Location: Las Vegas, Nevada
Posts: 137
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Re: Rear Tire's cupping
Good thoughts from all, I will check those bushings Ron that makes sense, I really like the NITTO's,
Safety Heads up. I do like putting some weight in the back. It makes a huge difference in them 555's grabbing pavement, I had a bit of a scare when I first got them on a Hot Las Vegas day, I was trying to get over into the lane I needed and had to quickly change lanes before exit and the person behind me was on board but and when I did I got a fish tail I wasn't expecting at only 60mph or so. I recovered but you guys know the helpless feeling The front tires I just put last week on are NITTO MOTIVO 275/40/17. New hub bearings, and a 4 wheel alignment, It feels like a new car again. Maybe they changed something when it was aligned that will help in the future with rear cupping, I will stop by and check with them about it. It was only last week. J. |
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11-03-2013
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#10 |
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Join Date: Oct 2013
Location: Colorado Springs, CO
Posts: 160
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Re: Rear Tire's cupping
Putting weight in the back them will change the rear alignment on a Vette. Also, more weight and driving them hard will put a strain on the tires. That kind of stuff has been known to cause cupping. Nitto 555's are street, not racing tires....they're not meant to really be abused on a consistent basis. Years ago, when I used to autocross, there were a handful of guys running trucks. They're front tires would do that badly after a day of autocrossing.
As a side note, next time you buy rear tires, depending on how much you drive and what sort of weather you drive in, you may consider drag radials. They're a cross between strip and street tires....they're not the best at cornering, but you can definitely drive them in dry weather. They'll handle the abuse a bit better than most street tires. C |
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