Kickr problems while free-wheeling

I have a Kickr that I’ve used for ~3 years, quite frequently (never have changed cassette) and have noticed lately if I’m free-wheeling that the chain will catch every revolution or so. If I’m not clipped in, the pedals move forwards a little sort of like a fixed-gear bike.

  1. Is this a cassette/chain issue? I only do my riding in the 52x19 but have this issue in other sprockets on the back too.
  2. Hopefully this isn’t making my workouts any easier? Ie watts are watts right?
  3. Cassette doesn’t seem loose but the flywheel contraption wobbles a little bit. Is this the problem?


That drag and chain movement usually indicates that the internal pawls and/or pawl springs are gummed up and not moving properly. Solution is to remove the freehub, remove old grease, clean, regrease and reinstall. Should coast better after that.

This is part of the process.

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Likely worn spacers/shims. See my video on this from whhheeeeeeeeey back:


Thanks for your replies. I emailed Wahoo to see how I could get these replacement parts. Any thoughts on whether or not this is making my TR training easier - I feel like even if a gunky flywheel is encouraging it to spin, watts are watts and shouldn’t be affecting the efficacy of my training overall (erg mode). Guess I’m looking for some reassurance…

Thanks, so I got a new inner spacer from Wahoo and took apart everything - until I realized the inner spacer is so corroded and I can’t get it off. I had enough trouble removing the freehub body but eventually got it off with brute strength. Any tips for how to remove the inner spacer? I tried to use needlenose plyers to no avail…

Heat. Then try to talk to it in a calm voice. I may just be going through a clingy stage. If that fails, get medieval on it’s ass.

Don’t forget a screwdriver.

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Hi guys, i am facing the same problem here with my 2014 Kickr.
I emailed Wahoo support and they say my model is too old and they do not offer replacement parts any more. Any idea where I can get a set of replacement shims? I guess I could machine them, but I’d still need the exact dimensions of the new part.
In the meantime I continue riding my kicker, hopefully, it’s not gonna make things worse.
Thanks in advance

Damn they suck. They can’t bother to stock a $3 part??? I guess I should make mine apart to clean and lube it to extend it’s life.

Does your shim look like the one in the video? In the video, it looks like the replacement part is actually longer than the original.

Hey there, I have the shim you need - Wahoo sent it to me back in ~March for my first gen Kickr but my old shim was so corroded that I couldn’t even get the old part off! Since then, I bought the new Wahoo Kickr so still have this part lying around. If you are interested and willing to pay for shipping, I’ll send it to you. Just DM me.


That’s amazing! I ll send you my address details. Thanks!

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I am just posting here just to let you know that i sent you my details with a pm.
I 'd be grateful enough if you could just measure the length of the replacement shims. Thanks!

Just wanted to publicly thank CapraHam11 for his help.
I just received the shim he sent and my 6 year old kickr seems to be working like new again.
Many thanks! Great stuff! :metal:


Reading this I’m wondering if I should order some common replacement parts for my Kickr18 in case the same problem arises at some point in the future. To scrap a £1000 machine for want of a shim seems crazy.


Hi there @CapraHam11 and @LiKuid! Any chance either of you could measure the proper depth of the new/unworn/uncorroded Kickr Gen1 shim? Is the inner shim supposed to be the same size as the outer shim? I am the lucky third owner of my 2014 Kickr and disassembled the cassette/freehub and shims for the first time today to clean all the grime out. After cleaning things up, I noticed the inner shim was much smaller than the outer shim and is also pretty banged up with scoring.

My partner had the idea to take the outer/intact shim to an auto specialty shop to see if they could measure and cut something identical to replace the worn down inner shim, but I am not sure what the correct size of the inner shim was originally. Any insight or help on this would be greatly appreciated!! Thanks in advance!

Hi there and Happy New Year! A bit late to reply, but here is the old vs new inner shim pics. Diff is small but makes quite a diff.

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Old shim

New shim


If you manage to cut some new shims, i ‘d be interested in some to have in stock. Good luck!

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Thank you for all this help-- really appreciate it! I will follow up with you if we wind up being able to cut new shims. Currently waiting to see what Wahoo has to say about everything…

Hi b-Blake. Did you get a response from wahoo?? My kickr has started doing the freewheel snagging thing. I’ve emailed them but no response.

did you mange to remove it ? i’m in the same boat here , need to also replace bearings in my pulley wheel but the spacer is stuck !