@arcos My first three units had the infamous “clunk.” My retailer took the first two back, and Wahoo took the third one back and replaced it with a “tested” unit that they had applied the key/bolt hardware fix to. This unit vibrated badly on freewheeling and Wahoo sent me a second “tested” unit that their service manager himself test rode before shipping. It also vibrates, but less than the previous unit. The vibration on this fifth unit can only be really felt when freewheeling when there’s not much resistance load (like during a spindown, or coasting downhill in Zwift).
Wahoo claims the vibration is “normal” due to the size of the freewheel, and that application of the magnetic resistance brake helps to stabilize the flywheel and thus reduce the vibration.
The fact is that the vibration is there from an unbalanced flywheel which is a manufacturing defect and QC issue (and/or rumored bearing issues, I’m not certain). Applying the magnetic brake (aka, riding with resistance, like in Erg mode workout, or climbing a hill in Zwift) might help stabilize it sure, but it also helps because it slows the flywheel down pretty fast when you stop pedaling, and when the flywheel isn’t spinning fast, the vibration is minimal. But when coasting downhill in Zwift if the flywheel is spinning fast or especially during a spindown calibration, the vibration is readily apparent as it vibrates the whole bike (and I can hear a low “buzzing” I think caused by the imbalance of the flywheel spinning at high speed). I imagine the vibration is there all the time while pedaling, it’s just harder to feel because of the drivertrain. That said, during normal Erg mode workouts and Zwift rides, it’s not bothersome.
But the OCD part of me that paid $1200 knows it shouldn’t vibrate at all, at any time. I loved my Kickr 2017 and it had zero vibration. I don’t know what the longterm consequences might be (like premature bearing failure), but the buzzing sound is getting louder the more I ride. That said, I have preordered a Neo 2, while I figure out if I want to return this Kickr 2018 for a refund. I’m not real sold on trying a sixth one. YMMV.
Oh, the other part of the problem is that Wahoo support basically told me they don’t need me as a customer anymore. They offered to refund this fifth Kickr, but are not offering me any more support or another replacement (regardless of whether I’d take it).
EDIT: See updated post below.