Re: Chain roller position?
If you can use no tensioner all the better. However some builds need a tensioneron the drive side (415) just to clear the frame. If this is the situation then that is all you need to have both chains (415 & bicycle) the proper length.
However if your drive (415) chain can be run with no frame interfearence problems, seldom will both chains be the proper length. Even if they do initaly as the drive chain settles into it's natural strech they will no longer match exactly.
So putting a tensioner on the chainring side you have some adjustment . Putting it on the this side, it sees virtualy no load and causes no problems. If you have a multi speed bicycle the derailure preforms the same function.
Last edited by Russell; 01-27-2011 at 01:56 PM.