Moving seat post

08-08.-2007, 11:04 AM	#1
bob161069 Registered User Join Date: May 2007 Posts: 26	Moving seat post Has anyone had a problem with a moving seatpost. I have an avanti sprint and no matter how tight i do up the seat post it still keeps dropping. It all most seems like a design problem. Or is this just my bike.

08-08.-2007, 12:02 PM	#2
tarmacguy Registered User Join Date: Aug 2007 Location: Australia-Perth Posts: 20	Re: Moving seat post cant say i have had this issue, perhaps could be the bolt, or the clamp..have u tightedned it too much that u have caused the seat post to become indented and now slipping down.

08-08.-2007, 12:30 PM	#3
bob161069 Registered User Join Date: May 2007 Posts: 26	Re: Moving seat post I have tightened the avanti alloy seat clamp pretty tight. But theres no indentations or damage as yet. It will slip down mm by mm over a 1hr ride. Just doesnt seem right.

08-08.-2007, 02:41 PM	#4
1id10t Registered User Join Date: Apr 2005 Location: Not where I would like to be Posts: 341	Re: Moving seat post I know this may sound like a silly question but is the seatpost the correct size/diameter? Also, do you have a seat clamp which goes around the seat tube or is the bolt integrated into the seatpost. Either way, have you check to make sure the bolt is not stripped.

08-08.-2007, 02:43 PM	#5
531Aussie Registered User Join Date: Apr 2004 Location: Melbourne, Australia Posts: 4,491	Re: Moving seat post assuming it's the right size and the bolt and thread are ok........ test it by whacking the nose of the seat kinda hard. It shouldn't twist. You've gotta check all the bits, like, make sure the clamp ends aren't touching in the middle, or the frame gap isn't coming together, and that nothing is stopping the screw being tightened way up

08-08.-2007, 08:09 PM	#6
bob161069 Registered User Join Date: May 2007 Posts: 26	Re: Moving seat post seat post is right 27.2 and clamp seems ok going to give it the wack test and see what happens

10-08.-2007, 12:52 PM	#7
cruisin Registered User Join Date: May 2007 Posts: 91	Re: Moving seat post Some quick release type seatpost clamps just won't tighten enough to hold a smooth seatpost. If this is the case you can look at a different clamp or a less smooth post or both.

10-08.-2007, 02:05 PM

1id10t

Registered User

Join Date: Apr 2005

Location: Not where I would like to be

Posts: 341

Re: Moving seat post

Quote:

Originally Posted by cruisin

Some quick release type seatpost clamps just won't tighten enough to hold a smooth seatpost.
If this is the case you can look at a different clamp or a less smooth post or both.

Good call. If it is a smooth seatpost maybe give it a light rub with sandpaper/emery cloth to rough it up a little. Obviously not the whole stem but only the portion which won't be seen. It might help.

10-08.-2007, 02:18 PM	#9
531Aussie Registered User Join Date: Apr 2004 Location: Melbourne, Australia Posts: 4,491	Re: Moving seat post If the bolt in the clamp is this type, with the 2 bits, sometimes the 'nut' end, and/or the bolt has to be cut. If the bolt goes through right through to the unthread bit, it obviously won't tighten properly, even if it feels as though it is. It's often hard to see if the the bolt is 'stopping' on any parts of the nut end Last edited by 531Aussie : 10-08.-2007 at 02:36 PM.

10-08.-2007, 03:52 PM

#10

62vette

Registered User

Join Date: Nov 2003

Location: Bay of Plenty

Posts: 832

Re: Moving seat post

Quote:

Originally Posted by 531Aussie

If the bolt in the clamp is this type, with the 2 bits, sometimes the 'nut' end, and/or the bolt has to be cut. If the bolt goes through right through to the unthread bit, it obviously won't tighten properly, even if it feels as though it is. It's often hard to see if the the bolt is 'stopping' on any parts of the nut end

Aye. I've had to shorten the nut end on a seat clamp bolt before.

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