Just bleed my reverb and noticed that when I sit on it the post drops about 1cm without pushing the button. It about 16 months old and I thinking about it, it was doing this before I bleed it.

Is is **** or can I fix myself?

Any help would be greatly appreciated!!

Chers,
Christian

Diet?

By any chance have you lifted the bike by the saddle when the post was down?

I assume it’s got a saddle fitted to it?

Is the pressure set correctly?

Mmmm. If I lift my bike by the saddle, my reverb extends by a small amount. But I think it contracts before I sit down.

Legend… what – errr… if someone had… a bit.

Yep have done that a few times, hike a bike and all that. Has that **** it?

My new one did this in May, only 4 weeks in to me owning it. Sent it back to SRAM who fixed it, stating ‘Air Gap’ as the cause with a whole host of seals and parts replaced.

It worked for a bit then did exactly the same thing again four weeks later. Sent it back again and got a brand spanking new one a week later.

The only thing it could be apart from completely foo-barred is that the pressure is down. Check it’s 250psi or otherwise a trip back for warranty beckons

*very embarreses* how do I check the air, where is the value?

Looked in google (and the post) but couldn’t figure it out?

Valve is in the bottom of the post…

unklehomered – Member
Legend… what – errr… if someone had… a bit.

mrchrist – Member
Yep have done that a few times, hike a bike and all that. Has that **** it?

Had a chat with the Sram guys at a recent race. Pulling the saddle up is likely to bugger the post a bit as (iirc) it can pull air past the seal, resulting in this dead spot when fully extended. Luckily, at the moment, they will cover warranty claims for this (suppose there’s no warning anywhere telling users not to do it)

Seen 2 like this, dropping about 10mm when sat on, both returned to Fishers under warranty and new post received about a week later.

Excellent will call my lbs to get that process started.

It knackers the post if you pull up on the seat!?!?!

SRAM missed that part of product development then eh…Poor that it happens but good that they are sorting them I suppose.

IIRC (can’t have speakers on in the office) the SRAM guy in this video says pulling up on the saddle won’t damage it:

[video]http://www.youtube.com/watch?v=Ag9tZESJMKs[/video]

Common problem after that sort of time of use (not caused by lifting the saddle). It’s a worn seal inside the post. Some air has managed to mix with the oil. A full service with new seals will fix it.

Mine was doing the same. I checked the air pressure and it was very low. Topped it up to 250PSI and all good (for) now.

I had to store my bike with the seatpost compressed. Not sure if that would cause any issues.

Mad Pierre – Member

Common problem after that sort of time of use (not caused by lifting the saddle).

So next time I see the Sram guys I should tell them they’re wrong?

As donal said

mine was the same, dropping 1cm with my weight on the saddle. checked the pressure and it was down to 150psi. topped it up and no probs since.

hope its that easy for you

The post is definitely faulty if it squidges. Mine started doing that after a couple of months, and has just been replaced under warranty by fisher. Had a complete mare getting Evans to replace it after the first replacement came back damaged and didn’t want to do anything about it. Got there in the end though.

legend – Member
So next time I see the Sram guys I should tell them they’re wrong?

You can tell them their colleague in the video above says they are wrong!

I’ve seen a couple of older posts (one was mine) that the problem happened on and neither post has been pulled up. It was just worn seals and sorted with new seals and service.

So, has anyone given fishers a post to sort, that they might have got from another ‘foreign’ shop?

My post is exhibiting the same set of issues as the OP.

IME Fishers/Sram will sort your post even if you bought it from Germany etc as long as the post is still within warranty period (its a worldwide warranty), although the warranty procedure will have to be processed through a Sram dealer/LBS.