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I've got an annoying creaking noise appeared if I am sat down pedalling.
It's no coincidence that I have just fitted a brand new press fit bottom bracket but I thought it would creak standing up to if it was that.
Could it be the dropper post ??
Any other ideas ?
a friend of mine had a similar creak. Ended up being a loose pivot bearing for the rear shock. he tightened it, and the creak went away.
Metal end cap on cable outer was a cause for me. Every time the suspension compressed the cable moved and it squeaked, did my head in. Took ages to find.
Seat clamp
Your arse.
Clean and regrease seat post, post clamp, saddle rails where you clamp to post and where they go into saddle she'll.
If still creaking start cleaning up other bits. Like above I've had cables creaking where grit got i the housing (internal routed) try holding cables as you ride. Creaky creaky, hold cable, if quiet it's them. More recently it's been my pedals which wobble on the spindles now.
Creaks get transmitted round the frame so it could be anything!
Other common one is rear quick release
I was thinking it may be the saddle and or the seat post as it only does it when sat down pedalling or even with feet off the pedals pretending to pedal.
After having loads of these over the years the honest answer is, it could be almost anything. When I get one I can't pinpoint I always schedule a full strip down, clean, check and regrease. That usually either pinpoints the problem or (more likely) resolves it without you ever finding out what it was.
I just finished stripping and cleaning my entire chainset in an effort to get rid of a horrible squeaky creaking noise. Turns out it wasn't that, but a slightly loose bolt on the dust cover of my main bearing (Orange 5). On the plus side, I now have lovely clean chainrings and chainring bolts, however I also need to sit in a quiet place with a cup of tea for a wee while to let myself calm down a bit! 🙁
C.
Dry seat tube?
Try greasing the seat tube before inserting the seat post. Greasing the seat post, most of the grease gets scraped off whemn you put the post in the bike and doesn't make it down to where the bottom of the post sits in the seat tube.
I had the same problem. Turned out it was my knees...
typically dropper manufacturers suggest using carbon paste rather than grease between seat post and tube.
Seat / seat post.
Take everything apart, grease and reassemble.
When the squeeking carries on, and it will, buy a new bike
As euro said , seat post clamp . Mine was too tight and it creaked like **** until I backed it off a bit
Remove your seat and grease the threads in the clamp that hold it...worth a try
I recommend you get a really squeaky saddle, drown it out
New bike time!
I had a post last week about rattly internal cables on my Anthem... It was the Giant dropper, which had been recently out for recabling to other side and was back in with fibergel and torqued up, tiny bit of grit at the collar......
Knees?
I have used silicone spray to narrow down the offending area, then strip regrease and rebuild as necessary.
I just ignore the creak......it frenzies the hell out my riding buddy but I can switch off to the noise 😆
Brand new Reverb & seat was creaking like hell!
Took the seat off, cleaned the clamp and rails.
Liberal spread of copper slip on rails and underside of clamp where is pivots on post.
Tightened up (not too tight).
Creak totally gone 🙂
Just sharing to help because this worked for me.
Just having the same problem - looks like a new headset for me 🙁
That happened to me on the way to work - I took the seatpost out and put it back in with less tension in the clamp. No more creaking 🙂
I sorted mine folks...... Sold the bike 
Cant hear it now .
Saddle (rails)
Being lazy - i usually spray the suspected area with gt85. if that works i strip and grease the offending area. If that doesn't work I try another area. Usually the seat clamp in my experience.
Had a creak that took ages to pinpoint, turned out to be the chest strap of my camelbak.