To help you keep the costs down, here is a method to estimate the CASTER of any front wheel. To get the CASTER you need to make 2 CAMBER measurements per wheel plus a formula. I bought a 10 inch Stanley bubble type torpedo level c/w rotateable degree index. To measure the CAMBER I just place the level vertical on the front circumference of the rim where the ends of the level sit on the rim.
Here is the formula:
K = ( 180 / pi ) * ( ( C1 - C2 ) / ( T1 - T2 ) )
Where:
K is the estimated CASTER
C1 is the +CAMBER when the DS wheel is FULL LEFT or the PS wheel is FULL RIGHT.
C2 is the -CAMBER when the DS wheel is FULL RIGHT or the PS wheel is FULL LEFT.
T1 is the +TURN ANGLE when DS wheel is FULL LEFT or the PS wheel is FULL RIGHT.
T2 is the -TURN ANGLE when DS wheel is FULL RIGHT or the PS wheel is FULL LEFT.
DS is the Drivers Side Wheel
PS is the Passengers Side Wheel
The more level the terrain the better.
For example if the TURN ANGLE were 25 Degrees at FULL LH or FULL RH, this is my Ford E450 sitting on a 1/2 degree side to side slope:
DS FULL LEFT +CAMBER = +4
DS FULL RIGHT -CAMBER = -1
PS FULL RIGHT +CAMBER = +3
PS FULL LEFT -CAMBER = -2
DS K = ( 180 / 3.14 ) * ( ( 4 - (-1) ) / ( 25 - (-25) ) = +5.7 Degrees
PS K = ( 180 / 3.14 ) * ( ( 3 - (-2) ) / ( 25 - (-25) ) = +5.7 Degrees
All we are trying to do here is get a ball park reading to see if it is worth while to pursue this further.
