New carbon bike - greased seatpost problem

ForumNewbie

I have just bought a new Cube carbon race bike. I've not ridden it yet (apart from along the street outside the shop) but just noticed the seatpost has been greased. The Cube manual that came with the bike specifically states you MUST NOT use any grease when fitting the seatpost. It is not even carbon paste/compound they have used, but normal pink grease.

I am particularly concerned because this bike replaces another new carbon Cube I bought from a different shop last month. It had to go back because the seat post starting creaking after a ride and got steadily worse until it was creaking loudly. The shop mechanics couldn't fix it so they sent it back to the factory and refunded me. I'm sure it was something to do with the fact the seatpost was greased.

Because I really liked the bike I bought this other Cube yesterday thinking my problem was a one-off. However as this grease has probably been on the seatpost and in the seat tube for a few months while the bike was on the shop floor, I am paranoid about the same thing happening again.

I am so pi**ed-off I just want to to take it back to the shop now while unridden and request a refund. What do you think?

Wirral_paul

http://www.bikeradar.com/forum/viewtopic.php?t=12534958

Personally i'd be happy to use a proper carbon assembly paste (I have a tube of Tacx stuff)- and have done so with my Moda and very expensive PRO carbon seatpost.

http://www.jejamescycles.co.uk/tacx-carbon-assembly-item105138.html

mattv

Call up the shop and query the apparent grease on the seatpost. See what they offer.

ForumNewbie

mattv wrote:

Call up the shop and query the apparent grease on the seatpost. See what they offer.

Thanks for the posts. I will phone them, but even if they offer to remove the grease, I think there may be damage that may not be apparant yet (after reading the link in the above post) as the grease has been in there since at least July when the bike was assembled. It's the last 2011 model of that bike in stock so they can't even offer me a replacement - and I don't really want a replacement now that I'm so disillusioned.

Monty Dog

I've been applying grease to carbon fibre since 1989 and never experienced any problems - plenty of experience of galvanic corrosion and sorting stuck seatposts due to lack of lubrication.

racingcondor

It's highly unlikely to have done anything. There have apparently been some post that absorbed grease and swelled (so that they couldn't be removed) but I've not actually come across anyone who knows of it happening first hand and I suspect it was a certain carbon finish that's no longer in use that was to blame.

I'd just wipe off the grease, buy some carbon grip compound and use that when you reinstall the post. You should be able to stop the creak and the grease may be a contributing factor (allowing it to move when it shouldn't).

rothers_bikeo

The Cube "Additional Operating Instructions" for carbon frames booklet does indeed state "Seat post and seat tube must not be greased". My 9 month old 2011Agree GTC Race has never been greased, coming up for 3000 miles, no creaking or sticking.

sungod

ForumNewbie wrote:

<...>
It is not even carbon paste/compound they have used, but normal pink grease.
<...>

some carbon assembly compound is pink, are you sure that's not what is on the post?

keef66

My pot of carbon paste is blue. Hard to confuse with grease cos it feels gritty.

I'd seek confirmation from Cube that by greasing the thing they have not invalidated your warranty.

And if they have, I'd want a full refund.

If not, I'd clean post and frame thoroughly and refit dry.

ForumNewbie

rothers_bikeo wrote:

The Cube "Additional Operating Instructions" for carbon frames booklet let does indeed state "Seat post and seat tube must not be greased". My 9 month old 2011Agree GTC Race has never been greased, coming up for 3000 miles, no creaking or sticking.

That's the exact same model I've bought. Yes, the instructions are quite clear and I am concerned that it will invalidate the warranty if it does start creaking like the one I had last month.

I'm sure it is grease as it's smooth - unlike carbon paste/compound which is gritty. Either way I don't think there should have been grease or paste used. While I could wipe the grease off the seatpost, it would be impossible to get it all removed from the inside the frame's seat tube. As the grease has been in there for months since assembled, I am concerned that it could have reacted with the carbon on the inside of the seat tube.

In view of the problems with the previous bike I had to take back, I don't want to risk it happening again.

Paul E

The carbon compound that came with my FSA seat post was a lightish red

ForumNewbie

Paul E wrote:

The carbon compound that came with my FSA seat post was a lightish red

Paul, was your seat post going into a carbon frame or a aluminium frame?

Mr Dog

I'd wipe away all traces of the pink stuff. Buy some Finish Line Fiber Grip. Job done, you'll sleep at night knowing your post won't fuse to your frame. Check it now and again and if your bike is off the road for any length of time slacken off your clamp.

racingcondor

Mr Dog wrote:

Check it now and again and if your bike is off the road for any length of time slacken off your clamp.

It's a carbon frame there is no danger of the seat post and frame bonding (that's usually caused by alu frames with steel seat posts, the two don't mix which is why a barrier layer of thick grease is important).

OP - You're right, getting the grease out of the seat tube won't be easy but you can get most out by pushing a duster down the tube with a stick (just be careful to hold on to a corner of the cloth so you can get it out again.

For an example of why you shouldn't worry think of all of the other joints that are greased (bottom bracket, brake bolts etc). No-one worries about the potential for damaging the carbon at these points.

Paul E

ForumNewbie wrote:

Paul E wrote:

The carbon compound that came with my FSA seat post was a lightish red

Paul, was your seat post going into a carbon frame or a aluminium frame?

Alu alloy frame, hasn't slippped and I have moved it a couple of times to get it right as its a new frame and I needed to get the height right for my knee

ForumNewbie

I phoned the shop today and explained the position. The guy listened to my concerns and asked me to bring bike back and they would remove the grease. I said I still wasn't sure if I wanted to keep bike in view of what happened with previous bike creaking after a few rides after similar problem.

After a while he phoned back and said he had looked into it and said grease wouldn't cause a problem unless it had been exposed to water, but he said they would remove grease fully from seat post and seat tube and replace with carbon paste. Although Cube manual says you MUST NOT grease (which I take to mean carbon paste as well) on seat post or seat tube.

He also said they thought the seat post was aluminium. I had been sure the seatpost (RFR Prolight 31.6mm Setback) was carbon as it looked like carbon and I thought all decent carbon framed bikes (like my Cube Agree GTC Race) would have a carbon seat post aswellI, but after looking at internet I can't find that exact seatpost for sale separately so still not sure.

Anyway still not sure whether to keep the bike and let them try to remove all the grease as they suggest. I keep thinking that I should have just bought a decent aluminium bike, like I was going to do initially!

Wirral_paul

Grease is totally different to carbon assembly paste. The danger with some greases is that they may react with the resin used in the carbon components and cause them to swell. This will only happen with some greases and some resins but as with most disclaimers on warranties - are there for that 1 in 100 occurrence.

You'll be fine with carbon paste anyway.

When degreasing - you can use citrus based degreasers on a rag. That should remove the last traces of grease. Dry thoroughly before fitting the seatpost back in though

andy_wrx

Tacx carbon assembly compound is pink and not gritty.

When I got my first carbon bike in 2006 I thought it grease and wiped it off...

...and then wondered why the seat post creaked so badly, until I took it back to the shop and they put more back on

sungod

ForumNewbie wrote:

rothers_bikeo wrote:

<snip...>
I'm sure it is grease as it's smooth - unlike carbon paste/compound which is gritty. Either way I don't think there should have been grease or paste used.
<snip...>

as andy_wrx says, the tacx carbon compound is pink and not gritty

tbh i can't recall seeing any pink grease, and a quick google suggests such a thing is for more intimate usage than is normal for a seat post, so it seems very likely that it's carbon assembly compound you are seeing

without it, my carbon post creaks like crazy and needs the clamp tighter to avoid slipping

on-yer-bike

Yep Tacx carbon paste is a red/pink and doesnt feel gritty like Finnish Line which is clear. My posts creak unless I use assembly paste. On my steel farme the carbon post slips down without paste. Cube might be saying this because with grease you would need to tighten the collar up too much to stop the post slipping. You need friction here not lubrication.

g00se

I've used Ritchey paste and it's pinky red too.

Another reason for not putting grease on a carbon post is that as the clamp shouldn't be over-tightened - grease may make the post slip and tempt you to tighten the clamp too much.

daveb99

I've just read this with interest, and minor concern. I've just built up my new carbon bike - a Planet X SL Pro carbon frame - and applied grease to the seat post (aluminium) before installing.

Do I need to remove it and wipe it all off/degrease, or does this apply only to carbon seat posts?

daveb99

Update on my post above, I've just checked and the seat tube on the Planet X frame has an Alu liner for the first 5 inches or so. So no problems using standard grease as its an Alu seat post as well. Phew!