My ultegra went right on. Makes you wonder about manufacturing tolerances.

Did the cassette body get notched?

It's not as straight forward as a few hubs... here's my wife sorting it out on ours. Skip to ~7mins (this won't link direct to the 7min part)

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Shane Miller - GPLama
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My hub was machined incorrectly. I called them up and had a replacement hub in a couple days. Easy to swap.

Called Cycleops, they said they got a bad batch of freehubs earlier this year.

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Let food be thy medicine...

Note to Cyclops: find a new freehub supplier!

Anybody know how to adjust the belt tension? I’ve had my Hammer since February and it worked flawlessly until mid September when it started making a rattling noise inside the housing. I reached out to Cycleops customer service who quickly diagnosed the problem as a loose belt. Cycleops said they would send out a new belt along with the installation procedure but still don’t have either the belt or instructions to re-tension the belt. I found a manual online but it only contained operating instructions.

I’ve been in constant contact with Cycleops but they said they’re still trying to put together the instructions on the belt installation. It’s been almost 6 weeks since I opened the case surely it can’t be that damned complicated to adjust the tension or replace the belt.

Thanks

Hmmm. Mine has the rattle, I hear it when I get off the bike and it’s free wheeling down. I only got the thing in april so I’m kind of disappointed. It seems to be working ok though.

Mine works fine I’m just afraid of the belt coming off in the middle of a training session. I’m a little disappointed that the trainer isn’t even a year old and its developed this minor issue which could turn into a major one.

I’m going to talk to the shop owner about it. He’s a really big cyclops dealer. I’ll report back after I hear what they tell him.

Thanks, please keep me posted. I think you’ll get an answer before I do.