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Tires cupping and feathering

Pro Street

Well-known member
Joined
May 20, 2005
Messages
95
Location
Texas
Corvette
2002 Yellow Coupe
Went to cruisefest4 at Colorado Springs,CO. and drove 1188 miles and noticed I picked up a front end vibration at 75 to 90 mph.Had front and rear alignment done after I lowered car 6500 miles ago.Also noticed the front tires are cupping and feathering on the inside and outside.I think I have a balance problem and a wheel alignment problem.My question is, is it toed in or out or caster or camber?
Has anyone had there tires do this?What was the fix?Thanks for any help!
 

muddywaters

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Joined
Aug 25, 2002
Messages
765
Location
wilkes-barre,pa.usa
Corvette
1988 white 4+3 coupe 99 Torch Red 6spd. coupe
Tires

Hi, My 99 Coupe feathered the insides of the front tires. Alignment shop found right front to be out, set to factory, which I understand will eat tires with those settings. The cars are set up for high speeds. Search some of the other threads, GMJunkie chimed in w/specs that are more tire friendly, but troublesome at 140mph. The shop I go to would not deviate from factory parameters.
 
Joined
Jan 19, 2003
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3,021
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5,800 feet above sea level
Corvette
2006 'Evil Stealth Black' Roadster
Hang in there, VJ. The best person to answer this question on factory settings for caster and camber is C4C5Specialist. I'm sure he'll be along soon.
:)

-Patrick
 

Pro Street

Well-known member
Joined
May 20, 2005
Messages
95
Location
Texas
Corvette
2002 Yellow Coupe
Hang in there, VJ. The best person to answer this question on factory settings for caster and camber is C4C5Specialist. I'm sure he'll be along soon.
:)

-Patrick

I did some searching but did not come up with anything yet.
Thanks VJ
 

VETTEX2

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Joined
Mar 27, 2001
Messages
449
Location
USA
Corvette
86 & 99 Z51's
I run zero camber all the way around,
toe is in a 1/16th front and rear
and caster around 7 with a 1/4 degree split ( a quarter degree less on the left side )
no cupping or feathering :D
 

gmjunkie

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Joined
Nov 11, 2004
Messages
4,547
Location
Old Fort NC/Vero Beach FL
Corvette
03 Z-51,78 L82 Coupe
I run zero camber all the way around,
toe is in a 1/16th front and rear
and caster around 7 with a 1/4 degree split ( a quarter degree less on the left side )
no cupping or feathering :D
I run Dead 0 camber all the way around and L 6+ and R 6.25+ caster with 3/32 toe in front 0 to 1/32 toe in rear!!! 26,000 miles on my tires now still have 6/32 + tread front and 5/32+rear!! Flat and Even across,I run 34 lb air front and 32 lb rear!!:upthumbs
 

Pro Street

Well-known member
Joined
May 20, 2005
Messages
95
Location
Texas
Corvette
2002 Yellow Coupe
I run Dead 0 camber all the way around and L 6 and R 6.25 caster with 3/32 toe front 0 to 1/32 rear!!! 26,000 miles on my tires now still have 6/32 + tread front and 5/32+rear!! Flat and Even across,I run 34 lb air front and 32 lb rear!!:upthumbs

I am going to print this off and take it to my alignment guy to show him what you guys are saying.He has Hunter equipment so he can do it right.His Dad has vettes and so does Travis.
 

wishuwerehere82

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Joined
Sep 6, 2003
Messages
2,314
Location
Rochester, NY
Corvette
Red '82 Coupe,Sebring Silver '98 Coupe
GMJunkies numbers are good!!!
I used them for my alignment last spring when I got new tires, and I have no signs of any of the bad things that were happening before.
That's exactly what I did. Copied his numbers and gave them to the alignment guy when I got there. They had to convert the toe-in numbers to degrees, but otherwise it went without a hitch.
You will like it a lot! But it is a little loose above 100 MPH because of the light toe-in, but the tires aren't cupping at all.
It doesn't feel like the same car afterward.:upthumbs
 

gmjunkie

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Joined
Nov 11, 2004
Messages
4,547
Location
Old Fort NC/Vero Beach FL
Corvette
03 Z-51,78 L82 Coupe
GMJunkies numbers are good!!!
I used them for my alignment last spring when I got new tires, and I have no signs of any of the bad things that were happening before.
That's exactly what I did. Copied his numbers and gave them to the alignment guy when I got there. They had to convert the toe-in numbers to degrees, but otherwise it went without a hitch.
You will like it a lot! But it is a little loose above 100 MPH because of the light toe-in, but the tires aren't cupping at all.
It doesn't feel like the same car afterward.:upthumbs
You think it feels a little loose above 100 ;LOL You otta feel it about 140-145 Pete!!!:chuckle:chuckle It's a Handful!!!!!:boogie:boogiePS.It's the light caster that makes it a little wormy!!:upthumbsWarning!!If you drive at speeds in excess of 135 MPH these settings are not for you!!!!
 

wishuwerehere82

Well-known member
Joined
Sep 6, 2003
Messages
2,314
Location
Rochester, NY
Corvette
Red '82 Coupe,Sebring Silver '98 Coupe
You think it feels a little loose above 100;LOLYou otta feel it about 140-145 Pete!!!:chuckle:chuckleIt's a Handful!!!!!:boogie:boogiePS.It's the light caster that makes it a little wormy!!:upthumbsWarning!!If you drive at speeds in excess of 135 MPH these settings are not for you!!!!
You know I don't drive that fast anytime.:) There's no place to do it around here without hitting potholes.
I will gladly trade off the high speed handling for that Cadillac feel at the wheel.
 

gmjunkie

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Joined
Nov 11, 2004
Messages
4,547
Location
Old Fort NC/Vero Beach FL
Corvette
03 Z-51,78 L82 Coupe
You know I don't drive that fast anytime.:) There's no place to do it around here without hitting potholes.
I will gladly trade off the high speed handling for that Cadillac feel at the wheel.
Yeah I know what your talking about!!! My car rarely sees 90!! But once in a while I get to give it the Juice!!:upthumbs
 

Pro Street

Well-known member
Joined
May 20, 2005
Messages
95
Location
Texas
Corvette
2002 Yellow Coupe
Car is fixed!
Had front tires balanced on a Hunter Road Force balancer and the right front was out bad.That fixed the vibration.Then they did a 4 wheel alignment and front and rear caster and camber was ok.The toe was out bad on the front and a little on the rear.Car drives great now.:D
 

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