one thing that drives me mad every single ride is a slack then tight chain as you turn the crank
this to take into account
chain has a tight link or split link not running smooth over the freewheel
chain ring in not in center by a couple of mills and throwing it out
freewheel is not centred and has a couple of mill to one side throwing it off
one piece crank is slightly off in line when bb nuts ar done up - screw thread throwing it out as the turning circle dips on one end
i just don't know what it is and it drive me mad as F'ing well
cheers B