>>1643214try this as a starting point
set saddle near parallel to the ground (very slightly nose down)
take inseam measurement in bare feet (.eg 78 mm)
for length between pedal top and seat top add 10.5 % (86.19 mm) Height A
for length between bottom bracket center to seat top subtract 10.26% (69.9972 mm) Height B
just while you are at it measure the height between the seat top and the ground on my bike it is 96 mm
anyway you should be able to straiten your right leg to full extension with the ball of that foot above the center of the pedal axle
and at the same time with your left leg only just be able to touch the ground with the tip of your toe (depending on Bottom bracket height and crank length)
>>1643215Oi you got a loicense for that ?
>friction shiftersthe shifter has to move further to change to the next gear than it does to hold the chain in that gear
so you have to over shift and then trim the shifter backwards
some rear derailleurs have float on the guide pulley to help with this, otherwise known as shimano centeron
