overthebars

Hi all, sorry if this has been asked before, did a search and didn't see it.

A while back I bought and installed a Pinhead seat post clamp and wheel skewers for my Scott Sub Speed 20 hybrid/city bike but darned if I can get the seat post tight enough. Invariably after an hour or so of riding the seat post ends up an inch or so lower than where it started.

Do Pinhead seat post clamps have a rep for not being up to the job? I tighten it as far as I can muster without the Pinhead wrench slipping and busting my fingers but concede I'm hardly a seasoned mechanic. Is there some type of substance I can apply to the seat post to increase the grip?

Crankycrank

Yes, carbon paste. Just one mfrs example here but others make the same thing. Finish Line Fiber Grip Carbon Fiber Assembly Paste (1.75oz) [F01750101] | Maintenance - Performance Bicycle (performancebike.com) Has a little grit added to the paste to provide grip and helps prevent corrosion a little as well if needed. You could also use a thin hex nut torqued to whatever works and then mount the Pinlock nut against it as a locknut that can't be removed without the special tool. As long as you have enough threads for both nuts it will be fine.