EC70 Seatpost

[Buff]

For the love of all that is holy, could someone please advise me on how to fix a saddle that keeps on sliding in the seatpost clamp?

 

I have an easton ec70 post and it appears as if the built in shim on the clamp is machined incorrectly as the top clamp make contact with the bottom clamp before exerting enough pressure on the saddle rails.

So far I've removed the top clamp and filed it down to create more pressure but this only worked for the first month or so (done this twice already).

I'm currently overtightening the sucker and I know it's just a matter of time before the bolt snaps... probably when I'm 100kays away from home as well. Another mate of mine has the same problem with his ec70, so it seems to a factory defect. 

 

Any suggestions?

 

PS! No Minty, I'm not going to buy a Titus just to replace the seatpost, but thanks for the thought anyway!

[Jean-Jay]

I have the ec70 setapost as well, riding a BMC.

 

Maybe try and get another seatpost

try perhaps an aluminium sleeve that can wedge between the seatpost and the seat tube.

 

[Mudsimus]

Thomson

[ORCA]

I have the same problem; my solution was a fizik saddle, moved right back. The saddle is long enough for me slide around and still be comfortable.

[Thug]

How about wrapping part of an old tube around the rails.

 

 

 

[bikemonster]

Leftfield suggestions:

1.  Decent hardware stores will stock brass "shimstock", which should do the trick.  Cut it to fit and wrap it around the saddle rails.

 

2. Cut strips of very fine grit waterpaper (wet 'n dry paper) to fit.  It's impervious to water and the fine grit will help it grip the saddle rails.

[niterider]

I had the same problem with my previous bike. I just loosened and re-tightened it and it came right after 3 or 4 times. No problems for the 18 months after that, even when I had to remove the saddle again for some reason.

 

Just got a brand new bike with brand new EC70 and no problem this time.

 

[splat]

Dynamic Carbon Assembly Paste

 

With the advent of carbon fiber components has come the awkward change of a time-honored detail of bike building: In the past you always put a nice dollop of grease on pretty much everything when you installed components. How things have changed! Nowadays grease -- especially on a carbon seatpost -- can sometimes be a surefire path to heartbreak. The slick clearcoat on many carbon components makes it so that if they come in contact with grease they're all-but-un-tightenable. The result is that people overtorque bolts in a futile attempt to keep said components from slipping, which ultimately wreaks carnage through snapped bolts, cracked clamps, and sometimes dented or crushed components.

Inserting components dry isn't an ideal solution. Dry components make noise, they corrode, and they too sometimes slip. Tacx invented their Dynamic Assembly Compound to cure these very problems. Think of it as Oil of Olay for your expensive bike gear: Use it for anything threaded or anything carbon on your bike. Its adhesive effect on carbon/carbon interfaces (i.e. carbon seatpost/carbon frameset) will allow you to reduce the amount of tightening torque you'll need by upwards of 30%. Beyond this, not unlike using Ti Prep on a titanium frame, it prevents the seizure of carbon/carbon interfaces. It's an antidote for corrosion, noise, over-torquing, and slippage. Comes in an 80g jar.

[Buff]

Thanks for all suggestions, considered the DCAP splat but it won't work if the shims are already in contact. Think I'll try bikemosters "shimstock" combined with the DCAP (to avoid squeaks) and see if that works.

[niterider]

The problem here isn't with the seatpost in the frame, but rather the clamp interface with the saddle rails. I'm speculating that maybe Easton's design is sensitive to non-alignment in the saddle rails, or that the diameter of the clamp where it compresses the rails isn't consistent.

 

But like I said, it sorted itself out for me. And there's about a million EC70 seatposts out there so it couldn't be a big issue?

 

[Buff]

You're right, it should be an issue, but it's forking frustrating when it is because it tends to stuff your knees up

[Dicky DQ]

I have a similar problem in that the saddle eventually tilts back, no matter how tight I fasten the clamp bolts.

[Mudsimus]

Uhm....Thomson..

[NotSoBigBen]

Thomson Elite

[Thug]

 

Thomson Elite

 

Luurrvve Mine

 

 

 

[SwissVan]

 

What material are the seat rails and clamp made off? <?:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

Assuming they are aluminum / steel you could try and ?roughen up? the interface areas of the clamp / seat rails with a bit of roughish wet n dry (just enough to create a surface which will provide some friction, and not so much that you actual loose material which will make the problem worse) and then apply some ?crocodile snot? to these areas and tighten the seat clamp, allowing the crocodile snot to dry.

 

Make sure the seat is in the correct set up position and dont use an adhesive (crocodile snot) that is designed for lifting bulldozers.

 

 

 

SwissVan2007-02-23 02:47:26