Clipless in Coeur d'Alene
Join Date: Mar 2012
Location: Coeur d'Alene, Idaho
Bikes: Tandems: Calfee Dragonfly S&S, Fandango 29er Mtb; Singles: Specialized Tarmac SL4 S-Works, Specialized Stumpjumper FSR, plus other misc Road & Mtb.
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We have never had a problem running the CenterTrack/CDX belt on a crossover or same-side drive at a lower tension than the Gates spec. I just set it by ear and feel. I saved a 83Hz tone to my computer and play it back occasionally to "calibrate" my ear.
Reasons to run lower tension?
1. A high tension timing chain or belt will cause unnecessary wear on the bottom brackets & bearings.
2. While the belts are robust enough to be used in mtn biking, it is still possible to break the carbon strands in the belt if you ever get anything caught in the belt & timing ring. Chances are better to not damage the belt if there is some wiggle room in its tension max. So far we have had one case where a small rock somehow kicked up onto the belt and made a horrible crunching sound as it met the ring, and another with our SSD setup where the drive chain overshifted the big ring and got caught in the belt/ring. We are still riding our original belt, with a spare remaining unused.
Last edited by twocicle; 05-05-14 at 09:20 AM.