Originally Posted by
Dave Mayer
Ummm. one-bolt posts are the easiest to adjust. This is why shops like and push them. It takes 60 seconds less to set them up than the superior 2-bolt (offset bolt) design.
The downside of the one-bolt post is that they will always slip, eventually. Always. And usually at the worst possible time.
There are two issues in this thread, the need for offset and one vs. two bolts. You can get an offset two-bolt post from many vendors.
If you can live with alu, then the Suntour Superbe Pro or XC Pro posts are the most reliable offset 2-bolt posts ever. Lots of these on Ebay still.
Half wrong, plain wrong, and right.
One bolt posts are easy to adjust, but many have serrations and the seat angle cannot be "micro-adjusted" to an in between angle. Easy micro-adjustability is one of the best features of the two bolt system.
While some one bolt posts slip, saying they all do eventually is a gross exaggeration. Most of these don't ever slip, but it's a matter of quality. One factor may be rider weight and how centered that is over the cradle. Heavy riders with unbalanced saddles are more likely to see slippage, but even that's rare with better posts.
You are right describing the two issues, offset, and clamp design, and if the OP wants an offset 2 bolt clamp, he can find posts, but the selection is more limited, and none may exist in his post diameter.
If he has to choose, I'd rank proper position over the clamp design, and buy a post accordingly.