I've got a Kindshock Dropzone seatpost with a single bolt clamp.
Even if I screw the bolt in hard the saddle will always slide to the back.
Any way to prevent it? It's pretty annoying.
Bicycles Stack Exchange is a question and answer site for people who build and repair bicycles, people who train cycling, or commute on bicycles. It only takes a minute to sign up.Sign up to join this community
I have never had a problem getting single bolt tight enough to hold.
Most likely is seat rail diameter - 7mm is common road, 9mm common MTB but there are others. (refer Wikipedia).
Is there something assembled wrong, a piece upside down?
Although seat post bolts need to be tight, what ever you do, don't be 'that' "gorilla with a spanner" - it is never the correct approach when assembling bicycles.
If I understand your question correctly, what you could do is add a thin piece of rubber underneath the rail clamp before you tighten it down.
That should have the same effect as using a rubberband to help remove a stripped screw.
The rubber will fill between the cracks that have been worn down, previously causing your saddle to slide back.
It's worth a shot considering it will cost you nothing or next to nothing.