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Dec. 13, 2016, 12:36 p.m. -  DrewM

#!markdown Correct, I do not run a tensioner. In my experience concentricity is never perfect so every single speed drivetrain will have 'tight spots' and 'loose spots'. I find the tight spot in the drivetrain and tension to it (leaving enough slack so the bike can flex without the chain restricting it). Oval ring is exactly the same situation. Nat ran the math and determined that the difference between max/min ellipses due to triangulation is .02″. The combination of .02″ and concentricity means the 'loose spots' are greater than with round rings but certainly not enough to make it a set up or retention issue. I do find I tension my chain more frequently through its life with Oval because of the larger difference between tight/loose.

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