pic: drivetrain idea (comments please)

[Daniel_LaFleur]

Originally Posted by bmarick

definitly the cross brace or extra bracing is going to be needed. Otherwise it will bow over time. Can some one explain the degrees of rap to me. I'm still a little new to the drive train systems.

A sprocket is basically a circlular object (360 degrees). You want the chain to wrap around at least 1/3 of the sprocket (120 degrees). I personally suggest at least 150 degrees wrap with no more than 180 degrees.

The more wrap you have the more forgiving your drivetrain will be, but you trade off that forgiveness with added drag and friction. Going less than 120 degrees of wrap invites the chain to jump off of the sprocket.