What Do You Do To Keep Your Seat From Moving

I find using one of these solves all those issues.



But your way opens up some seat choices and is cheaper.
This style post requires a twin rail seatpan

I double-nutted one side of my worksman seat post clamp bolt, so I could tighten the other side as tight as possible. It's worked so far.

When I have a frustrating problem like seats moving or handlebars, it almost always comes down to a cheap part or a part not being correct for the application. A good quality part correctly matched to the application will almost always do it's job correctly. But lets face face it, there is a lot of junk out there, and cheap parts on a bike can be downright dangerous. Buy quality matched components and the problem goes away. If ANYTHING requires a shim then the parts don't match.

exactly, pat. i use brooks saddles on most of my bikes and they never move.

i also have a box of old seat parts, so if i use a cheap cruiser seat on something, i find an older clamp. the newer one's don't hold.

Yeah, I bought some of those cool repop vintage style handlebars with the cross brace. 7/8" tube bars with no center knurl or swedge area up to 1". Guy supplies this cheap aluminum shim with the bars. Those bars will not hold for anything. He said it was because I put them on a motorbike. Well, it was a pedal bike at the time. I tried steel motorcycle handlebar shims, too. They STILL moved. Seller said it was my stem so I tried a couple different stems. Still moved. I bought a properly manufactured set of good old Wald cruiser bars for $18 with center knurl and 1" swedge. Those bars didn't budge! Proper design, proper matching components, problem solved! Buyer beware.