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Is it normal to have this many weights on the front tires? The rear tires seem to be what I'd consider normal but the fronts seem excessive. Thoughts? I seen a few post on here about road force balancing of the front tires due to unbalanced rotors. If it helps, this is a 2010 ZR1.
Front Driver side has 10
Front Passenger side has 12
Rear Driver side has 3
Rear Passenger side has 2
10 weights - Driver Front 3 weights - Driver Rear 12 weights - Passenger Front 2 weights - Passenger rear
Depending upon the tire installer and the balance machine, and time restraints, they will attempt to balance with the least amount of weight as possible. That is accomplished by mountimng the tire, getting the balance data, and shifting the tire position until the amount of balance weight is minimal.
2 of your tires are extremely good, while the other 2 are very reasonable The rule of thumb is the balance weights should be max 1% or less of the total weight of the tire/rim.
If a tire/rim weights 65 lbs, then 1% would be 6.5 oz of balance weights.
Assuming that each one of your blance weights is 1/4oz, then 12 would be 3oz, which is more than acceptable
Depending upon the tire installer and the balance machine, and time restraints, they will attempt to balance with the least amount of weight as possible. That is accomplished by mountimng the tire, getting the balance data, and shifting the tire position until the amount of balance weight is minimal.
2 of your tires are extremely good, while the other 2 are very reasonable The rule of thumb is the balance weights should be max 1% or less of the total weight of the tire/rim.
If a tire/rim weights 65 lbs, then 1% would be 6.5 oz of balance weights.
Assuming that each one of your blance weights is 1/4oz, then 12 would be 3oz, which is more than acceptable
Makes sense and each weight has a 25 on them which I suspect is as you mention...1/4 of an oz a piece. I appreciate the confirmation and explanation.
Some brands of tires are better than others. My car came with Coopers and had quite a bit of weights, I just put on Michelins and no wheel has more than 3.
Back in the day, before lead became the devil, the weights themselves would have been smaller and less noticeable. The steel (fe) weights are larger for their weight.
I balance my own motorcycle tires and bought several pounds of stick-on lead weights before they became an issue...
Seems pretty excessive to me. I have mine road force balanced and they will rotate the tire on the rim until the location requires the absolute least amount of weight. In some cases they will try a different tire to try to get the balance as close to zero as they can. None of my vehicles have anywhere close to this many weights.
Seems pretty excessive to me. I have mine road force balanced and they will rotate the tire on the rim until the location requires the absolute least amount of weight. In some cases they will try a different tire to try to get the balance as close to zero as they can. None of my vehicles have anywhere close to this many weights.
We all know one major problem is inadequate equipment plus inadequate knowledge and rushing just to get the job done.
Seems pretty excessive to me. I have mine road force balanced and they will rotate the tire on the rim until the location requires the absolute least amount of weight. In some cases they will try a different tire to try to get the balance as close to zero as they can. None of my vehicles have anywhere close to this many weights.
Originally Posted by saplumr
We all know one major problem is inadequate equipment plus inadequate knowledge and rushing just to get the job done.
Then there's the desire (or lack thereof) to pay for it.
On my old C4, I had chrome ZR1 wheels (repro) I ordered it on line and they ran a special with the tire that I wanted. They checked the last tire and said the rim was out of spec and were waiting for the new rims to arrive so that they all could be balanced correctly.
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Originally Posted by 1Willy1
service everywhere sucks , expecting a tire shop to remove the tires and re mount them until they find the sweet spot is never going to happen
slap the weights on and "NEXTTTTTTTTTTTTTT"
Balance machines check the inside of the wheel with a laser in order to determine an out of round condition. They check the tire for an out of round condition using an external roller. Then the machine tells you how to relocate the tire on the rim to have them compliment each other. Only works if the wheel is out of round though.
It's not trial and error. Unfortunately, if you drive the car hard, you can rotate the tires on the rims and now you've got an out of balance condition again. The best policy is to just have things right to begin with.
If the op jacks the car up, sets up his phone to video the wheel rotating from the inside (under the car), then spins the front wheels, he'll see the inside of the rim is bent and running out. It'll coincide with the wheel weights, but just watch the edge of the barrel as it spins and you'll see it. It's easily fixable, I did my own.
Some brands of tires are better than others. My car came with Coopers and had quite a bit of weights, I just put on Michelins and no wheel has more than 3.
No doubt, and if it matters these are the original Michelin Pilot Sport run flats so they may require more weight?
A few pics of the front driver's side tire.
Original run flats that came with the car. Tires date shows 19th week of 2009. You can still see the Michelin guy on the tires tread. Front Driver side tire. 285/30/19
Last edited by c05v3tt3; May 16, 2019 at 09:34 AM.
Seems pretty excessive to me. I have mine road force balanced and they will rotate the tire on the rim until the location requires the absolute least amount of weight. In some cases they will try a different tire to try to get the balance as close to zero as they can. None of my vehicles have anywhere close to this many weights.
Given the responses so far, it seems this will vary greatly depending on the tire, shop, skill set, etc.
Balance machines check the inside of the wheel with a laser in order to determine an out of round condition. They check the tire for an out of round condition using an external roller. Then the machine tells you how to relocate the tire on the rim to have them compliment each other. Only works if the wheel is out of round though.
It's not trial and error. Unfortunately, if you drive the car hard, you can rotate the tires on the rims and now you've got an out of balance condition again. The best policy is to just have things right to begin with.
If the op jacks the car up, sets up his phone to video the wheel rotating from the inside (under the car), then spins the front wheels, he'll see the inside of the rim is bent and running out. It'll coincide with the wheel weights, but just watch the edge of the barrel as it spins and you'll see it. It's easily fixable, I did my own.
Interesting, I probably should have scrolled down further before responding to your previous post. I should also note that I don't have any vibration issues or drive-line issues at this time such as the infamous 70-80 mph vibration I've seen on the forum stickies. I wonder if the bent rim is from the factory or due to road conditions or both? If you've fixed (with balancing I presume) your own then it seems to me it may be more common then I would have thought. I'll have to check it out as you suggested to see for myself but it's not something I commonly look for when under the car. Good feedback either way though.
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Wheel Weight excess
