Originally Posted by VISHNUCARCRAZY
Can you elaborate Mr.Suryaputhra
Because i have sidewall damage on my rear passenger side tyre .(I had posted previously the same,and my wheel technician said that it can be rotated only sidewise ,by shifting to driver side rear,and all other tyres will be rotated based on thread wear).
I would always recommend to do alignment at 5k sir.
First time i am hearing it as 15k.
In factories manufacturers use profile based alignment and balancing. If you maintain correct tyre pressure and rotation, balancing lasts for at least 20k km and alignment holds good for 10k km to 15k km.
Most of the cars we use today do not have option of adjusting camber and caster, Only Toe can be adjusted. Outside alignment shops do a big picture like alignment is a very complicated procedure. Actually they adjust just Toe.
Manufacturer usually specifies Toe in mm, the maximum allowed difference between Toe in to Toe out is +/- 1 mm to 2mm for most of the cars. This should be checked using Toe bar.
Problem with outside alignment shops they measure Toe in degrees. When they correct Toe in degrees you don't get proper accurate result. Because you can not convert degrees to mm directly, it should be converter to inches and then to mm, so you lose accuracy. So often you do alignment your car out of Toe.
There are three types of tread wear
1. Camber wear, this results in trad wear halfway through either from inside or from outside. This is very rare unless you met with serious accident.
2. Toe wear, this results in tread wear which happens at outside quarter of the tyre tread. This is due to improper Toe adjustment by incompetent alignment shops. Over the time your car leans to the side where you have more tread wear.
Caster will also causes side leaning but it is very rare unless you met with serious accident. Caster tyre wear is extremely rare.
Most of the race cars and high performance cars they use Toe bar to adjust Toe in mm.
This is all about alignment there is nothing mystic in alignment.