Motor Vehicle Maintenance & Repair Asked by Brydon Gibson on October 1, 2020
I recently had a customer come back with the complaint that around 110km/hr the vehicle is very shaky after installing winter tires.
I retorqued all four tires and none of the lugs moved. Air pressure was fine and I examined the tires for balancing weights or marks where a balancing weight may have fallen off. All of them had weights and I couldn’t find any places where a weight may have come off.
Customer states they had just bought the tires (used), already mounted on rims.
I know it’s customary in the shop I work in (and others) to give the tire a good kick or a whack with another tire if it’s seized on.
Is it possible hitting the tire with a reasonable amount of force could throw out alignment? I would assume it would only do so in an already weakened vehicle. If not – are there any other potential sources of the shake? I told the customer to go get the tires checked for balance, as that was the only possible culprit I could think of.
If the car shake at speed higher than 105 km/h it's the balance of rear tires or maybe bent rear wheel rim. If shaking occurs when going 50-100 km/h it's the front tires/wheels problem.
Answered by AsenM on October 1, 2020
You can check toe alignment yourself with just a length of nylon line, tacked into tire tread front and rear, middle of tire. Then measure from line to rim, front and rear of rim, both tires. No, you won't throw out alignment, even beating tire with a sledgehammer unless something is very loose that shouldn't be.
Most likely tires are out of balance or have a broken belt. I've had broken belts on multiples tires and feels like a balance issue. Check tire for lumps or protruding steel wires in some cases.
@AsenM front tires cause steering wheel shake, rear tires cause whole car shake, irrespective of speed. You may be more likely to notice front at lower speed as the wheel is right in your hands shaking vs vibration in your seat, but speed has no relation to front or rear tire balance whatsoever. Many other drivetrain issues can cause whole car shake as well.
*edit - to actually adjust toe using line you need to have tires on slip sheet, like 2 pieces of metal with oil between, but that's a writeup for another time.
Answered by jbtvt on October 1, 2020
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