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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
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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