7.75 ounces to balance a wheel/tire

[46addict]

I know the point of balancing a wheel/tire assembly is to reduce vibrations, but I'm wondering if a wheel takes a lot of weight to balance, there's an underlying problem.

Today I went to have my used MT ET Radial Pros mounted on brand new Welds, and one of the wheels took 10.75 ounces to balance. The other wheel did not take as much. The tire tech used 26 quarter ounce weights on one end of the wheel, and 17 on the other. They were very busy today and I didn't want to have them dismount and remount if it's not something I need to worry about.

TireRack says the consensus is if it takes more than 1% of the wheel assembly to balance, there may be a problem. The wheel is 18lbs and the tire has to be at least 35 from what I felt, which would put me at 848 ounces. 10.75 would be over 1%. I need to put the assembly on a scale to be completely sure of my numbers. So can I run these at the track with this much weight? I haven't driven the car yet so I don't know if there are any vibrations.

 

[weather man]

I would have had the tech rotate the tire on the rim and try again.

 

[stkjock]

Yea, that tire needs to be indexed and rotated. I jpaked the tire tech to do,that when mine was asking for 4 oz IIRC

 

[Pentalab]

I suspect the tpms sensor mounted on the valve stem could easily throw the balance off..any rim. If the tire is indexed and rotated, is that normal, or a manufacturing defect, or within tolerance ?

 

[46addict]

These are track tires so I didn't bother having TPMS installed in them. But I can see how they can throw the balance off. I know nothing about tire construction but I imagine there are heavy and light spots in every tire and if you were to index the light spot on the opposite end of where the TPMS sits, you can still be balanced. I understand indexing/rotating to be normal practice because tires and wheels don't have perfectly even weight distribution.

 

[Norm Peterson]

Wouldn't you want the heavy spot on the tire opposite to the TPMS?

Many tires do have paint spots for match-mounting for balancing purposes.


Norm

 

[skwerl]

IMO if the tire is that far out of balance then it's defective. Either molded off center or else a belt is separating internally. I had a tire like that once on my Bullitt. They rebalanced it and tried to tell me it was fine with 5+ ounces of weight (and it was still out of round). The tire was less than 6 months old and I finally got them to replace it under warranty.

 

[Marble]

I had this issue with my wheels and discovered there were two ways to balance wheels, hubcentric and lugcentric. We were using hubcentric, machine couldn't do it by the lugs so I had to take it to a tire shop with a lugcentric balancer, problem solved.

it's basically using the lugs on studs attached to the machine instead off the cone though the hub. Good luck.

 

[OX1]

My MT ET SS's took a whole bunch of weight too. So much weight I had to
use 4 ouncer's on outer edge of rim and a whole bunch more
internal too.

It's not a rim problem. Rims balanced out to almost zero.
They vibrate bad @ 90ish, lucky I only use them on the track.

 

[86GT351]

Yea, that tire needs to be indexed and rotated. I jpaked the tire tech to do,that when mine was asking for 4 oz IIRC

With this said. Was it conventionally balanced or Road Force Balanced? Road Force Machine allows the tech to isolate the exact location of the issue and tells them where to rotate the tire to for optimum balancing.

 

[stkjock]

It was just a spin balance

 

[46addict]

Wouldn't you want the heavy spot on the tire opposite to the TPMS?

Many tires do have paint spots for match-mounting for balancing purposes.


Norm

It was 4am when I posted that response and I had that backwards.

 

[46addict]

I had this issue with my wheels and discovered there were two ways to balance wheels, hubcentric and lugcentric. We were using hubcentric, machine couldn't do it by the lugs so I had to take it to a tire shop with a lugcentric balancer, problem solved.

it's basically using the lugs on studs attached to the machine instead off the cone though the hub. Good luck.

I am pretty sure the Welds I am using are lugcentric so that would make a lot of sense.

My MT ET SS's took a whole bunch of weight too. So much weight I had to
use 4 ouncer's on outer edge of rim and a whole bunch more
internal too.

It's not a rim problem. Rims balanced out to almost zero.
They vibrate bad @ 90ish, lucky I only use them on the track.

Does that vibration go away after 90? And are you okay with having a vibrating wheel at the track?

 

[OX1]

Does that vibration go away after 90? And are you okay with having a vibrating wheel at the track?

Yeah only does it in one spot around 95, even @ 125 they are fine.

Not crazy about it, but I bought them way before using them and
they are on some really deep dish bullitts, with a 3" lip to recess
where bead has to fall on install.

Absolute nightmare to install, not sure if I could ever get them off
without possibly ripping bead. Don't run them anywhere near that
speed on road.

 

[46addict]

With this said. Was it conventionally balanced or Road Force Balanced? Road Force Machine allows the tech to isolate the exact location of the issue and tells them where to rotate the tire to for optimum balancing.

Conventional balancing. I'm hoping it's just a bad balancing technique and not bad tires.

 

[teeje]

It shouldn't take that many ounces...either the tech didn't put the right size of rim or he did it wrong to begin with. My 19x10 gt500 rims only took .5 ounces

Sent from my SM-G955U using Tapatalk

 

[Norm Peterson]

It shouldn't take that many ounces...either the tech didn't put the right size of rim or he did it wrong to begin with.

Neither of those would surprise me, from what I've seen first-hand over the years.


Norm

 

[46addict]

It shouldn't take that many ounces...either the tech didn't put the right size of rim

What do you mean by that? I provided the wheels and tires and they just did the mounting and balancing.

 

[teeje]

As in out the correct rim size and tire size and psi into the balancer. I'm going to assume they have a balancer with simulated road force dont they?

Sent from my SM-G955U using Tapatalk

 

[46addict]

No this was not a roadforce balance. They took the wheel and tire off the car and spun it.