Originally Posted by
Campag4life
Trek's seat mast designs SUCK. So does Speciallized...my Roubaix came with the Pave single bolt and it slipped as well on my bike. Difference is, you can retrofit a 2 bolt seatpost on a Speciaized and can't on a Trek. This is a COMMON industry issue with single bolt seatposts. The industry is split about 50/50 on single versus 2 bolt posts and there are NO issues with 2 bolt posts.
Here is just one thread about it...tip of the iceberg.
Madone 5 Series Seatmast issues. The clamp won't stay put!!! Suggestions?
Also, aside from your pristine shop, BB90 has been problematic for owners as well including carbon shell wear.
I agree. The clamp on the Domane seat mast topper is the worst clamp in the business!
Among the many issues is that, due to the way it the clamp sides wedge into the mast body, it is VERY DIFFICULT ,if not I mpossible, to get the two sides of the clamp at exactly the same angle! Also, no matter what you do, when you tighten the clamp, the angle of the saddle changes. Compensating for this is also almost impossible because you have to loosen the bolt and tap the wedges out, which almost inevitably results in the clamp sides shifting again. Rinse and repeat, over and over. It's TERRIBLE. A simple two-bolt would have been so much better.
I think there's probably an opportunity for someone like Easton to make a third-party replacement and have commercial success, because pretty much everyone I know with the seat mast hates it and struggles with it.