Find the place you are going to mount your forward controls onto.
Sit on the bike/trike.
Place your feet to a position where it is comfortable then get someone to measure from the mounting point to where you want the lever to be; The inside of your boot is a good indicator of where the lever will be.
All we need is the measurement from the mounting point to lever (or inside of your boot),
Please see the diagram below for further details:
