Quote:
Originally Posted by JBF
Interesting. I figured changing the tyre pressure will change the way that the tyre sits on the road and therefore the angle that the wheel sits at. I guess we are talking about tiny angles and massive forces (gravity + mass of car).
Oh and an American to English translator wasn't required, that made perfect sense..  |
Most modern alignmnets are done with a machine that clamps a 'fiducial' onto the wheel itself. A three legged assembly with a angled reflector. This essentially translates the angle OF THE METAL WHEEL ITSELF to the machine. The tires simply hold the car up in the air, they don't 'constrain' nor hold the wheel at some odd position. You will see them roll the car back and forth, as it sits on a roller plate- this lets the car 'find a neutral position'.
Obviously you want all 4 tires the same size, and approximately at normal pressures. (Not two at 40 and two at 20). But a few PSI, or even an alignment on old tires should not have a big impact. IMO