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I used a BSP-97 Postfix from BBB to help with seatpost slip on the gravel bike.
It's a supplementary collar that clamps around the post and sits above the normal seatpost clamp to stop it sliding. I should get another one for my eeSilk, not that it's slipping, I just like using them to mark post height + insurance.
hippy
@spj7
My post kept slipping on a Secan v1 also. I swapped out the Hope seatclamp for a Wolf Tooth one in 29.8mm. Seems better so far.
I can tell you from experience that the Salsa Lip Lock in 30.0mm also works. Both have the little barrel nut which keeps the bolt straight as you tighten it up. The Hope ones just have a captive nut which means that the bolt has to bend slightly (or something equally bad) because the opposing faces are not aligned as it tightens up.