Tire Balance or?
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 8,561
Likes: 946
From: Communist Colorado
Tire Balance or?
86 Coupe 35,600 miles base suspension
Ok so I just last week had a 4 wheel alignment done.
All my shocks are new Bilsteins.
I have checked and double checked wheel bearings, all front end parts for wear and movement... there is none anywhere!
Tires are new looking but 6 year old BFG's
All 4 wheels/tires are Road Force balanced
Wheels torqued to 100 lb/ft
Rotor and wheel mating surfaces are clean
I cant seem to get rid of a vibration in the steering wheel for the most part...but I can also feel it in my butt.... at about 62 to 75 ish...
I have brand new rear wheels & tires out back 315/35/17
Fronts are 245/45/17
I jacked the car up and spun the front wheels checking for a bent rim or out of round tire....Rims look true. I did notice a little "hop" on the front left tire... I swapped a rear(the 9.5 245/45/17 that was on the rear) to the FL position and the vibration is still present.
Im down to thinking it might be the steering rack (it does display some light morning sickness) or tires even though they appear new.... I was going to buy 275/40/17 as replacements....
ANY ideas?
Thanks Guys!!
Ok so I just last week had a 4 wheel alignment done.
All my shocks are new Bilsteins.
I have checked and double checked wheel bearings, all front end parts for wear and movement... there is none anywhere!
Tires are new looking but 6 year old BFG's
All 4 wheels/tires are Road Force balanced
Wheels torqued to 100 lb/ft
Rotor and wheel mating surfaces are clean
I cant seem to get rid of a vibration in the steering wheel for the most part...but I can also feel it in my butt.... at about 62 to 75 ish...
I have brand new rear wheels & tires out back 315/35/17
Fronts are 245/45/17
I jacked the car up and spun the front wheels checking for a bent rim or out of round tire....Rims look true. I did notice a little "hop" on the front left tire... I swapped a rear(the 9.5 245/45/17 that was on the rear) to the FL position and the vibration is still present.
Im down to thinking it might be the steering rack (it does display some light morning sickness) or tires even though they appear new.... I was going to buy 275/40/17 as replacements....
ANY ideas?
Thanks Guys!!
Last edited by 81c3; Dec 12, 2017 at 05:18 PM.
Burning Brakes
Joined: Jun 2001
Posts: 1,086
Likes: 40
From: Osage Beach,MO,USA
How long have you owned the car?
Always had vibration? If not, when did it start?
Doubtful steering rack at 36000 mi - any accident history?
Belt separation in tire?
Wheel out of round? - bought aftermarket wheels, had vibration - out of round was not found until third Roadforce technician found inside of wheel was out - not all technicians know what they are doing even though they have the equipment. Good luck finding problem.
Always had vibration? If not, when did it start?
Doubtful steering rack at 36000 mi - any accident history?
Belt separation in tire?
Wheel out of round? - bought aftermarket wheels, had vibration - out of round was not found until third Roadforce technician found inside of wheel was out - not all technicians know what they are doing even though they have the equipment. Good luck finding problem.
Melting Slicks
Joined: Sep 2008
Posts: 2,376
Likes: 111
From: Cherokee National Forest TN
Use a dial indicator to check the wheels on the car for lateral & radial run out. Check both outside & inside rim lips = 4 checks per wheel. Chevy wants .030 max run out in any direction.
Lateral run out can often be reduced / eliminated by indexing the wheel on the hub. Clock the wheel one lug stud @ a time then indicate, locate the wheel @ the point of least run out. Mark a wheel stud & the wheel for correct reassembly anytime a wheel is removed.
If more than .030 radial or lateral run out replace the wheel.
BTW Had vibs on my 89, had road force balance + checked wheels as above the cause was an out of balance front rotor.
Lateral run out can often be reduced / eliminated by indexing the wheel on the hub. Clock the wheel one lug stud @ a time then indicate, locate the wheel @ the point of least run out. Mark a wheel stud & the wheel for correct reassembly anytime a wheel is removed.
If more than .030 radial or lateral run out replace the wheel.
BTW Had vibs on my 89, had road force balance + checked wheels as above the cause was an out of balance front rotor.
Last edited by Churchkey; Dec 13, 2017 at 03:30 PM.
Safety Car
Joined: Aug 2009
Posts: 3,751
Likes: 275
From: Melbourne, Victoria, Australia
86 Coupe 35,600 miles base suspension
Ok so I just last week had a 4 wheel alignment done.
All my shocks are new Bilsteins.
I have checked and double checked wheel bearings, all front end parts for wear and movement... there is none anywhere!
Tires are new looking but 6 year old BFG's
All 4 wheels/tires are Road Force balanced
Wheels torqued to 100 lb/ft
Rotor and wheel mating surfaces are clean
I cant seem to get rid of a vibration in the steering wheel for the most part...but I can also feel it in my butt.... at about 62 to 75 ish...
I have brand new rear wheels & tires out back 315/35/17
Fronts are 245/45/17
I jacked the car up and spun the front wheels checking for a bent rim or out of round tire....Rims look true. I did notice a little "hop" on the front left tire... I swapped a rear(the 9.5 245/45/17 that was on the rear) to the FL position and the vibration is still present.
Im down to thinking it might be the steering rack (it does display some light morning sickness) or tires even though they appear new.... I was going to buy 275/40/17 as replacements....
ANY ideas?
Thanks Guys!!
Ok so I just last week had a 4 wheel alignment done.
All my shocks are new Bilsteins.
I have checked and double checked wheel bearings, all front end parts for wear and movement... there is none anywhere!
Tires are new looking but 6 year old BFG's
All 4 wheels/tires are Road Force balanced
Wheels torqued to 100 lb/ft
Rotor and wheel mating surfaces are clean
I cant seem to get rid of a vibration in the steering wheel for the most part...but I can also feel it in my butt.... at about 62 to 75 ish...
I have brand new rear wheels & tires out back 315/35/17
Fronts are 245/45/17
I jacked the car up and spun the front wheels checking for a bent rim or out of round tire....Rims look true. I did notice a little "hop" on the front left tire... I swapped a rear(the 9.5 245/45/17 that was on the rear) to the FL position and the vibration is still present.
Im down to thinking it might be the steering rack (it does display some light morning sickness) or tires even though they appear new.... I was going to buy 275/40/17 as replacements....
ANY ideas?
Thanks Guys!!
You would be surprised the amount of tire manufacturing defects, most road cars will have soft suspension so you wont notice.
On a Corvette well that's another story, you can run over a coin on the highway and know of its heads or tails. an out of round tire or tread mold defects will shake the car like crazy.
Perhaps get them balanced elsewhere and ask they check the tires for high spots, good luck.
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 8,561
Likes: 946
From: Communist Colorado
Vibration through the wheel would be caused by out of round tires, buckled rotors or bad wheel balance.
You would be surprised the amount of tire manufacturing defects, most road cars will have soft suspension so you wont notice.
On a Corvette well that's another story, you can run over a coin on the highway and know of its heads or tails. an out of round tire or tread mold defects will shake the car like crazy.
Perhaps get them balanced elsewhere and ask they check the tires for high spots, good luck.
You would be surprised the amount of tire manufacturing defects, most road cars will have soft suspension so you wont notice.
On a Corvette well that's another story, you can run over a coin on the highway and know of its heads or tails. an out of round tire or tread mold defects will shake the car like crazy.
Perhaps get them balanced elsewhere and ask they check the tires for high spots, good luck.
I have 4 wheels to choose from so I can have the shop pick the 2 best rims to mount the new tires on to. Typically the ones with the least amount of weights I suppose would be the best choices. I noticed 2 of mine took only one or two 1/4 oz weights and two took quite a bit more..
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 8,561
Likes: 946
From: Communist Colorado
Use a dial indicator to check the wheels on the car for lateral & radial run out. Check both outside & inside rim lips = 4 checks per wheel. Chevy wants .030 max run out in any direction.
Lateral run out can often be reduced / eliminated by indexing the wheel on the hub. Clock the wheel one lug stud @ a time then indicate, locate the wheel @ the point of least run out. Mark a wheel stud & the wheel for correct reassembly anytime a wheel is removed.
If more than .030 radial or lateral run out replace the wheel.
BTW Had vibs on my 89, had road force balance + checked wheels as above the cause was an out of balance front rotor.
Lateral run out can often be reduced / eliminated by indexing the wheel on the hub. Clock the wheel one lug stud @ a time then indicate, locate the wheel @ the point of least run out. Mark a wheel stud & the wheel for correct reassembly anytime a wheel is removed.
If more than .030 radial or lateral run out replace the wheel.
BTW Had vibs on my 89, had road force balance + checked wheels as above the cause was an out of balance front rotor.
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 8,561
Likes: 946
From: Communist Colorado
How long have you owned the car?
Always had vibration? If not, when did it start?
Doubtful steering rack at 36000 mi - any accident history?
Belt separation in tire?
Wheel out of round? - bought aftermarket wheels, had vibration - out of round was not found until third Roadforce technician found inside of wheel was out - not all technicians know what they are doing even though they have the equipment. Good luck finding problem.
Always had vibration? If not, when did it start?
Doubtful steering rack at 36000 mi - any accident history?
Belt separation in tire?
Wheel out of round? - bought aftermarket wheels, had vibration - out of round was not found until third Roadforce technician found inside of wheel was out - not all technicians know what they are doing even though they have the equipment. Good luck finding problem.
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