[Canadmos]

I have a seat post clamp from Transition on my TR450, but everytime I go ride, the seat post ends up slipping down a few centimeters over a few hours. How tight am I supposed to crank on this sucker? I'm making it pretty tight, but I don't want to damage the frame or break the bolt on the clamp.

Any tips?

 

[bad news]

I had that problem on my transam...eventually the clamp basically wore out (developed a big ridge on the cam lobe part) from me cranking the **** out of it. I tossed it in favor of one of those fancy Salsa clamps. Now I look like a Homer but I gotta say that fancy salsa clamp holds the seat post right in place with less effort on my part (more mechanical advantage).

As to frame damage, I'm not sure how hard you'd have to tighten it to do that but I can tell you it's pretty ****ing tight haha.

 

[FlippinSweet]

Maybe double check the seat post is a 31.6 and not a 30.0 like the BR and Blindside.

Also, you didn't mention if it's a QR or a pinch bolt style. If it's a standard pinch bolt you can crank down pretty hard.

 

[Transition Bikes]

Is your seatpost greased? If your seatpost is dry it could be causing it to slip. Counter intuitive... but lightly greasing the post makes a huge difference.

 

[Canadmos]

It came from the shop greased, which I thought might be the cause of it slipping. So I whiped it all off and it still does it. It always slips the same amount too.

 

[rpet]

No slipping problems here with an ungreased Thomson 31.6. Six days at whistler and the post didn't move once. What kind of post do you have - maybe there's a defect somewhere?

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I've broken two Salsa clamps: a QR from over-torquing/deforming and a bolted one seized and sheared.

 

[ebxtreme]

No slipping with an ungreased Thomsen as well for me. I'm also using the stock seatpost clamp (with a 6mm allen bolt).

EB

 

[Canadmos]

Maybe I just need to make it a tad tighter. The post I'm using is a new Race Face Diabolus.