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I could be wrong, but I think the stiffness thing was from back before Gates developed the centre track system... So if there was too much flex the belt could work its way off the cog and ring sideways. Centre track has made that pretty much impossible now.
It's also allowed the belts to be run with a bit less tension.
Black_Rainbow_Project
M_V
Interesting.
I noticed in that video the guy mentions the stiffness off the frame being important and then I read a post on Facebook this morning that mentioned stiffness of the rear triangle in relation to belt drive. I wasn’t aware that the Omniums has particularly beefy rear ends and when I think of English bikes I tend to think of skinny seatstays, not sure about chainstays... what’s your thoughts on rear triangle stiffness?
Only belted bike I’ve had was a trek district and it made that rubbing noise which I put down to flex in the rear end but then it was from before the belts with the centre track.