Wed Apr 27, 2011 9:29 am
String was quite good enough for the professional racing outfit I was once associated with, so it'll be quite good enough for most of you as well.
The thing that is essential (for camber measurements more than toe), is a flat and level area. The race team had a fancy aluminium deck thing that was set up carefully on several screw jacks to be perfectly flat and level, but I make do with my four post ramp, which was carefully installed to be dead flat when fully down.
I measure camber with the aid of two 600mm lengths of 50 x 50 timber, hinged together at one end, and a strip of plywood, screwed to one piece only, spanning both pieces at the other end, so that as you open the hinge, the non screwed piece slides across the plywood.
Two 75mm wood screws are screwed into one piece, so that when the 'gauge' is held against a wheel rim, the two screw heads contact the rim diametrically opposite each other.
Take a spirit level and find a surface that is exactly vertical. Place the screws on this surface with the spirit level on the opposite side of the 'gauge', and adjust one of the screws so that the spirit level is vertical. The gauge is now ready for use.
Place the screw heads on your wheel rim, the spirit level on the opposite side, and open the hinge until the spirit level is vertical. Mark the plywood strip or measure the gap at the end away from the hinge, divide the gap by the length of the gauge, and you will have the natural tangent of the camber angle.