I’m pleased to report that at no time during the 100 or so miles we logged on Friday and Saturday at this year’s Southern Tandem Rally did our Gates sync belt / sprockets give us even a hint of slipping, even when faced with several pretty steep / high-output climbs. Therefore, as suspected, it appears I was not getting the torque values where they needed to be on our Bushnell eccentric going only by feel, as the only thing I changed after last week’s belt skip was using a torque wrench to tighten the eccentric to a little more than it’s 90 in lb spec.
I was able to confirm there wasn’t any eccentric movement by placing a benchmark on the aluminum eccentric shell with a Sharpie pen that lined up with the eccentric fixing bolt. The photo above clearly shows that mark did not move off-center from the eccentric fixing bolt during our weekend rides, which was very good news.
So, with the slippage problem hopefully behind us, we’re looking forward to several hundred more miles of belt-driven bliss… but will remain ever vigilant in checking the eccentric for any movement.