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I get about a year out of a belt drivetrain before it starts getting noisy, but that's working six days a week on it. But I literally don't have to touch it during that time. If I could afford to keep a spare drivetrain ready then I'd have no issues, but I never seem to have the money spare, so I run it until it's on its last legs, and then complain when I can't get replacements quickly enough. 😂
I love belt drive though. After over a decade on them I think I'd struggle to go back to regular chains.
If you're considering a Rohloff, I'd say try and save to get it, rather than settle for an Alfine or similar. My Alfine has been nothing but trouble on this particular bike, so I'm finally switching to a Rohloff after two years. Hopefully it'll be a much more pleasant experience.
Definitely not. I've been having to buy belts and front rings from the US as I can never get the ones I need here.