p@ul250

Hi Stuart, Yes over the wheel base of the bike. What I used to do before I got my jig set up was to draw a straight line on the workshop floor longer than the bike and stand the bike on it with the steering straight and the bike upright ( a small digital & magnetic level on the rear disc works well). Use a large square to drop a line down from the center of the rear axle and then measure 9.5" forward from it and mark a line at 90 degrees out from the first line (this marks the centre line for the sidecar wheel spindle. Measure out 34.5" along this second line from the first line and this marks the minimum track center of sidecar wheel ( You can make it wider that 34.5" if you like, but not thinner and comply with the ACU's rules). With the sidecar set up on these marks use a long straight edge set against the sidecar wheel as near to spindle height as you can and measure from the center of the front and rear wheel out to the straight edge. Front measurement should be 1.5" less than rear.

 I hope this helps and I'm not teaching granny to suck eggs. Out of the nine outfits in the attached photo I built six of them.

Regards   

Paul.