Rear Derailleur Rubs on Trainer

Has anyone else had an issue with their rear derailleur rubbing against their trainer when in their lowest gear? I have the H2 from Cycleops and the 6800 Ultegra groupset and I’ve checked all my alignments, everything is fine and it shifts well; using the same cassette as on my actual bike.

I contacted Cycleops and their response was “Long cage derailleurs like your Ultegra can rub on the casing on the H2, there is unfortunately nothing we can do to make it go away. I apologize for the inconvenience.” Less than helpful :-/

Is the best solution to lower the resistance in Zwift and just not shift into the lowest gear?


My Sram short cage RD rubs on my hammer when I’m in the 28. It’s just a design flaw as CycleOps clearly know and aren’t keen to invest the money in addressing.

Hi Marianne,
I never noticed the rear mech rubbing on my Cycleops Hammer before but this week I
put a new rear mech, Shimano 105 5800 short cage (same as previous mech), on my my bike which has 11 speed cassette 11-28 tooth and when setting up the gears I noticed on the 28t sprocket it was rubbing the side of the trainer as you described, I thought it was something wrong with the mech but the mech is fine and it must have done the same with the one before, I can`t believe that Cycleops would design their high end trainers that cost a lot of money to go out knowing this was a happening!!! Unbelievable.

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I’ve been having the same issue and after contacting Cycleops, they’ve suggested the dust cover my be warped. I’m attempting to fix per the picture but don’t hold out much hope of it being a long term remedy since it will likely spring back in to its warped shape fairly quickly!


That also happens on the Tacx NEO, depending on the bike and cassette. I did have it with my outdoor bike (custom build with 11 speed Ultegra), but don’t have it anymore with my old Domane 2.0 with 10 speed Tiagra.

It wasn’t very bad by the way, but enough to cause light scratches.

[edit:] Just remembered that I ended up putting an extra ultra thin spacer on the body, that was just enough to stop the scratching in my case (you couldn’t even see the difference with the bare eye, tho).

Bull $ hit. This is a design flaw and they know it. I’ve thought about taking a sander to it but didn’t want to dust to mess anything up on the inside.