Why would new tires shake at high speeds even after balancing when they didn't shake before?

Answer 1

Usually when new tires are installed, they will be put 35 psi of air pressure in them. Look at the label inside the drivers door to see what tire pressure your manufacture recommends for you vehicles suspension setup, and then check your tire pressure. If lower tire pressure will dampen the shake, then it is an undesirable product of the vehicles design.

Then again, I have had carelessly installed balancing weights fly off a tire before. If this happens to a front tire, it will be much more noticeable, especially if it was a large weight that was used to balance the tire. More information would help, vehicle make and model, number of doors.

If tires shake after a new install, there are quite a few possibilites. These are the most common. The car needs to be taken back to the place of the install and all tires spin checked on the tire balancer for a good smooth roll and perfect balance. If by chance you bought the lower price tires they sold you may have out of round tires. This makes the tires hop no matter how well balanced, and they will shake until they are turned on the wheel to cancel the "bad roll". This doesn't mean you have bad or defective tires. You have to understand that all wheels and tires have a high spot on a 360 degree circle. Nothing is perfectly round. On problematic tires this can be fixed. If the appropriate measures when taken to cure the problem, and it didn't fix it....That tire must be replaced. Full warranty of course. This happens with Michelin and some other top brands...not just your cheaper lines. If you have custom wheels, these require two plane balancing with sticky weights. You might need a more qualified shop to cure this, as it gets tricky. With fancy wheels, find a good tire shop and stick with them if you have good experiences with them. Rotate every 6,000 miles religiously! Some people do more often and some less, but with 6,000 you can't go wrong and will have decent life and tire wear. Combine this service with oil changes to save time and money. Change your oil every 3,000mi and rotate your tires every other oil change. You can't go wrong with those basic rules. Good Luck!