I never had a quick-release seatpost collar, just the one with an M5 bolt.

On my 2.5-year-old bike, I have succeded to snap the bolt once and to break the collar once. It definitely showed a crack near the bolt hole.


BTW, I never had a stuck seatpost. Maybe I'm too finnicky with height adjustment, because I tend to readjust it twice a year (for Winter boots and Summer shoes respectively), and it then takes me a full month each time to fine tune the adjustment. I guess it prevents it from rusting in place.

Regards,