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Anyone have experience with a Trek rear Isospeed?

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Anyone have experience with a Trek rear Isospeed?

Old 11-22-20, 01:27 AM
  #1  
tsmith41094
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Anyone have experience with a Trek rear Isospeed?

Have a Trek with the adjustable rear Isospeed Decoupler in the head tube. Have been getting a creaking noise during my last few rides most noticeable when climbing in the saddle.

Went through a bunch of troubleshooting steps associated with the saddle and seat post (removing, re-greasing/carbon pasting, torque specing, etc.) and it doesn't seem to be getting better.

I can re-create the creaking if I hold the bike in place and push down on the saddle. It sounds like the noise is coming from the joint where the head tube meets the seat post.

Wondering if anyone has had this issue? If so, is there a component that might need greasing or some other attention?

Thanks guys!
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Old 11-22-20, 11:02 AM
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Head tube? You mean seat tube, right? The head tube is the one at the front, the fork goes through it. I worked for Trek for a while (service mgr at a Trek owned shop) and dealt w/ a bunch of IS issues. Sounds like you might have some corrosion where the bearings press into the frame. I'd remove the cover and have a look for starters.
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Old 11-22-20, 11:33 AM
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When you buy a carbon frame creaking is part of the experience. Seat tubes, bottom brackets, bars and stems etc. its part of the charm of owning a carbon frame.

Look at the thread for the Cannondale SuperSix seat tube The fix was to put a business card in there to stop creaking. People actually pay upwards of $5,000 for that privilege.

Embrace it 🤩

Last edited by Mulberry20; 11-22-20 at 11:51 AM.
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Old 11-22-20, 04:01 PM
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Originally Posted by Mulberry20 View Post
When you buy a carbon frame creaking is part of the experience. Seat tubes, bottom brackets, bars and stems etc. its part of the charm of owning a carbon frame.

Look at the thread for the Cannondale SuperSix seat tube The fix was to put a business card in there to stop creaking. People actually pay upwards of $5,000 for that privilege.

Embrace it 🤩
Huh. I didn't know that. Now I'm worried.

My carbon frameset doesn't "creak" -- anywhere. Even has Specialized's Future Shock in the head tube. That doesn't "creak" either. Even has the dreaded 'wedge'-style seat post clamp thingy. That doesn't "creak" either. B/B area? Nope.

Hmmmm. Was I short-changed? Defective frameset? Should I ask for warranty service to rectify this deficiency and install some "creaks"?
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Old 11-22-20, 04:03 PM
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Originally Posted by badger1 View Post
Huh. I didn't know that. Now I'm worried.

My carbon frameset doesn't "creak" -- anywhere. Even has Specialized's Future Shock in the head tube. That doesn't "creak" either. Even has the dreaded 'wedge'-style seat post clamp thingy. That doesn't "creak" either. B/B area? Nope.

Hmmmm. Was I short-changed? Defective frameset? Should I ask for warranty service to rectify this deficiency and install some "creaks"?
Same here 5 carbon bikes and no creaks. Should we start a class action suit and claim what's rightfully ours?
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Old 11-22-20, 05:43 PM
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Originally Posted by tomato coupe View Post
Same here 5 carbon bikes and no creaks. Should we start a class action suit and claim what's rightfully ours?
Seriously considering it. I smell a windfall prospect!
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Old 11-22-20, 07:10 PM
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I never had any issues with creaking on my SuperSix, but I did have some on my Synapse. Not had any issues on my Domane. The only thing I hear is the tires on the road.
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Old 11-22-20, 07:18 PM
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Originally Posted by Mulberry20 View Post
When you buy a carbon frame creaking is part of the experience. Seat tubes, bottom brackets, bars and stems etc. its part of the charm of owning a carbon frame.

Look at the thread for the Cannondale SuperSix seat tube The fix was to put a business card in there to stop creaking. People actually pay upwards of $5,000 for that privilege.

Embrace it 🤩
What about steel, Ti, and aluminum? Are they all magically silent or are you just butthurt over something that happened with a carbon frame?
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Old 11-24-20, 12:17 PM
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Originally Posted by cxwrench View Post
What about steel, Ti, and aluminum? Are they all magically silent or are you just butthurt over something that happened with a carbon frame?
I've only had two carbon frames and neither of them creaked. I am, however, going crazy trying to chase down a creak in a steel frame with a threaded bottom bracket.
My apologies to the OP that the thread is veering off topic. No experience with IsoSpeed here.
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Old 11-24-20, 03:44 PM
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My non-adjustable rear ISO Speed has a creak but not all the time. It doesn't bug me enough to try and find a solution, maybe in time.

Sorry I don't have a fix for you.
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Old 11-24-20, 04:01 PM
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Originally Posted by tomato coupe View Post
Same here 5 carbon bikes and no creaks. Should we start a class action suit and claim what's rightfully ours?
I have 4, and they all creak like crazy if that is what we need to say to win.
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Old 11-25-20, 07:38 PM
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Never had a creak on my Aluminum Domane. That said, I always felt the Isospeed was a bit of a gimmick. I finally gave up on this bike after vibration and road chatter took its toll on my body.

I've since moved on to steel framed gravel bike with a carbon seat post and wider, supple tubeless tires. Not as speedy as a road bike, but a hell lots more fun and cut down that road chatter. Id rather be comfortable over fast.
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Old 11-25-20, 07:58 PM
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Originally Posted by tsmith41094 View Post
I can re-create the creaking if I hold the bike in place and push down on the saddle.
Not to dismiss any of the other suggestions, but can you re-create it with the saddle removed?

John
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