Toe in: (of the sidecar wheel, towards the motorcycle, measured at the front of the front wheel tyre and the rear of the rear wheel tyre) for a motorcycle on diagonal tyres the formula is: lead in cm's X  2 = toe in in mm'sFor a motorcycle on radial tyres this is:lead in cm's = toe in in mm'sHere too, a margin ± 10% is acceptable.
 THE MOTURIST-FORMULA Ed Pols developed his own formula for the key measurements of motorcycle-sidecar geometry. Universal rules of thumb that are very handy, especially when mounting the sidecar for the first time. The standard measurements are calculated as follows: Lead: (centre of sidecarwheel to centre of rear wheel, measured parallel to the longitudinal axis of the motorcycle) dry mass of the motorcycle in kilograms = lead in milimeters (for example: when the dry mass of the bike is 220 kg's, the sidecar wheel lead should be 220 mm's). A 10% margin is acceptable.
 Lean out of motorcycle: on diagonal tyres 2°-5° on radial tyres 0°-3° Track:as narrow as possible Sidecar position : horizontal in all directions (measured on an unloaded rig, standing normally on it's wheels).