Seatpost clamp not tightened properly or was it something else?
Definitely a case of user error here, think the clamp needs a good clean and then maybe a bit of grip paste to be on the safe side.
Yeah a good clean and some grip paste couldn’t hurt.
You’re not using a shim by any chance? Was just doing a bit of Googling, think my error was me greasing the outside and in of the shim, where I only really needed to grease the outside.
No shim, luckily Brand-X do a 26.4 seatpost so I didn't need one.
@Qebrus started
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Definitely a case of user error here, think the clamp needs a good clean and then maybe a bit of grip paste to be on the safe side.