Retrobike Forum Index

It is currently Mon Dec 05, 2016 5:39 pm

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 14 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: Creaky carbon frame???
PostPosted: Fri Oct 11, 2013 3:15 pm 
retrobike rider
retrobike rider
User avatar

Joined: Wed Mar 03, 2010 11:59 am
Posts: 4437
Location: Near Southampton
Hi

What I thought was a creaking bottom bracket in my carbon frame isn't! After fitting a new BB its still there! What could it be...it only occurs when I am out of the saddle putting a lot of force through the cranks. It sounds like a cracking rather than a grinding if that makes any sense! I have checked and checked again the frame for cracks but can't find any. Might be the pedals but it sounds like its coming from the frame around the BB area. Did wonder if it was the freehub on the rear wheel? Or could it be the chain?

Help before I go mad!

Doug


Top
 Profile  
 
PostPosted: Fri Oct 11, 2013 6:05 pm 
retrobike rider
retrobike rider
User avatar

Joined: Wed Jan 04, 2006 10:12 pm
Posts: 2993
Location: Northumberland
Are the dropouts tight? Does it do it with the seatpost out of the frame


Top
 Profile  
 
PostPosted: Fri Oct 11, 2013 6:27 pm 
retrobike rider
retrobike rider
User avatar

Joined: Wed Mar 03, 2010 11:59 am
Posts: 4437
Location: Near Southampton
P20 wrote:
Are the dropouts tight? Does it do it with the seatpost out of the frame


Will check the drop outs when I get in from work...haven't tried it without the post in either...thanks


Top
 Profile  
 
PostPosted: Fri Oct 11, 2013 7:35 pm 
Retro Guru

Joined: Tue Dec 01, 2009 10:24 pm
Posts: 295
Could it be the crankset ? Do you have a spare to try ?


Top
 Profile  
 
PostPosted: Fri Oct 11, 2013 9:23 pm 
retrobike rider
retrobike rider
User avatar

Joined: Wed Mar 03, 2010 11:59 am
Posts: 4437
Location: Near Southampton
citrixccea wrote:
Could it be the crankset ? Do you have a spare to try ?


A possibility but its a new XTR one around 6 months ago and no I don't have a spare one to try out...could it be that I need to use "carbon paste" is assembling the bike parts (seat post, BB etc?)


Could be creaky pedal threads although it sounds a bigger cracking sound than they would produce!


Top
 Profile  
 
PostPosted: Sat Oct 12, 2013 5:51 am 
Retro Guru
User avatar

Joined: Sun Dec 18, 2005 10:44 am
Posts: 461
Location: Vancouver
I'd certainly apply carbon prep to the seat tube. Slight flexing of the seat tube can cause the seat post / tube interface to creak when dry. It'll also help the two parts from seizing which is pretty common with carbon as they are often a tight fit.

Loose rear wheel spokes is another thing to look at.


Top
 Profile  
 
PostPosted: Sat Oct 12, 2013 11:07 am 
Old School Grand Master
User avatar

Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4431
Location: Herts UK
is it a new or s/h frame? has it always done this?

if you are off the saddle, then I don't see how it can be the saddle or seat post.

does it creak in the same place on the pedal stroke - if so, where on the stroke - on one side or both sides?

what bottom brakcet type is it?

can it be headset/stem/bars?


Top
 Profile  
 
PostPosted: Sat Oct 12, 2013 11:35 am 
retrobike rider
retrobike rider
User avatar

Joined: Wed Mar 03, 2010 11:59 am
Posts: 4437
Location: Near Southampton
Well after another strip down here is what I have found...

- BB is fine XTR and brand new
- Chainring bolts all tight
- Still makes the creak/crack with the seat post removed
- Greased pedal threads
- Rear dropouts tight


BUT...when I changed the rear wheel for another (albeit a 26"!) the creaking stopped! My thoughts are now that it could be the freehub on the rear wheel...it spins quite stiff but with no play, but does sound a bit grawnchy when listened to close up. How ever I have a big fear now that the freehub looks like an integral part of the hub!! Therefore not sure that I will be able to just change the freehub and it might be a whole new hub and wheel re-build!! :shock: The hub is a Bontrager rxl and the number on the freehub is FH-68-P5 (see pics)

Any ideas if I can just change the freehub?

Doug


Attachments:
photo.JPG
photo.JPG [ 112.52 KiB | Viewed 706 times ]
photo (1).JPG
photo (1).JPG [ 141.31 KiB | Viewed 706 times ]
Top
 Profile  
 
PostPosted: Sat Oct 12, 2013 11:41 am 
Old School Grand Master
User avatar

Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4431
Location: Herts UK
I doubt very much the fh is integral.

I recently remved a bont. Fh using large allen key i will pst back on the size

Removal id different to shinano as the key fits in from the non cassette side.
The fh was on tight and i suspect i crackex the hub so had to buy a new hub fom usa as it was rare 28h hub .... annoying to say the least.


Top
 Profile  
 
PostPosted: Sat Oct 12, 2013 10:07 pm 
retrobike rider
retrobike rider
User avatar

Joined: Mon Oct 19, 2009 3:35 pm
Posts: 1185
Location: Sunny Bognor Regis
I had a similar problem, and found it was dirt under the hanger. Cleaned it out and hey presto. ..


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 14 posts ]  Go to page 1, 2  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 7 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group