New tires = must do alignment
My car does not pull to left or right and the wear pattern is kinda normal...I am just afraid if they touch it ...they may make it worst. The car has not had an alignment done ever.
1999 w210
83k miles
But, I am with you regarding this....don't fix what ain't broken.
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And if a tire guy ever suggests that to me, I'll promptly ask him/her if he is out of his rabid assed mind.
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Unless the diameter difference between the tires is massive, it shouldn't affect the geometry enough to matter.
Unless the diameter difference between the tires is massive, it shouldn't affect the geometry enough to matter.
Like I said above, the alignment should be checked with the tire installation. It doesn't mean it is always required however.
My rep just drove it on the ramp and i watched and it was slightly off in the front, i just got new tires too. but for them to check it should be free, but if its off i would just get them done. But doesn't seem like you would need alignment without any uneven tire wear or anything like that. I had slight uneven wear on my front tires. i was positive camber there for some reason, the car's suppose to have a bit of neg.
The first factor in a vehicle's alignment is it's ride height. New tire = new ride height. Therefore it is quite common to need an alignment when installing new tires.
Like I said above, the alignment should be checked with the tire installation. It doesn't mean it is always required however.
Think about it this way. They align the car from the factory with new tires. As the tires wear, the ride height drops and it comes "out of alignment" (quotes used because the difference of a few mm in tire height is barely measurable and will not affect tire wear noticeably). When you put new tires on, it is back to the original ride height that it was aligned from the factory.
Alignments adjust camber, caster, and toe. When ride height drops, it generally affects camber. A few mm drop has a very small affect on camber, and a small change in camber has very little affect on tire wear. If anything, the additional negative camber will improve handling. The thing that really eats tires is either toe or major negative camber (from an inch or more of drop). The difference in tire tread should affect neither of those.
As stated above, if you were happy with your alignment (no unwanted pulls), steering wheel position (centered) and tire wear on your prior tires, then you don't need an alignment.
Getting it checked can't hurt, and you might even find worn parts before they cause a problem.
Most people, out of the 18,000 cars I've serviced, have their cars aligned or ask for their cars to be aligned way too often for no reason or for the wrong reason (suspension/brake/tire problem).
Think about it this way. They align the car from the factory with new tires. As the tires wear, the ride height drops and it comes "out of alignment" (quotes used because the difference of a few mm in tire height is barely measurable and will not affect tire wear noticeably). When you put new tires on, it is back to the original ride height that it was aligned from the factory.
-shrug-



