From Fred Rafael Rednor, edited:
> In my experience, these posts are strong enough but the
> clamp uses an inferior design which does not have sufficient
> grip on the seat's rails. So the seat will have a tendency
> to slip, especially if you try to mount it offset towards the
> rear. I weigh about 125 pounds - so I imagine this problem
> would be even more pronounced for heavier riders.
> Good luck,
I will not deny any problem you might have had, still I weigh 220 pounds and have ridden one some 20+K miles, offset to the rear, without any slipping problems. Reliable, easy to adjust.
Olof in Uppsala