I need some help. I am a newbie when it comes to bikes, so feel free to ask me anything needed.
I bought this bike half a year ago.
I recently bought a smart trainer (Tacx Flux S Smart), and innocently bought an 11-speed cassette, which I then realised it wouldn’t work properly with the bike above (it has a 9-speed cassette, 9-speed derailleur, etc).
I returned the cassette and bought a “SHIMANO CASSETTE HG400 9 speed 11-34”. I mentioned that my bike has a 9 speed 11-42 cassette, but was told 11-34 should be fine.
I just mounted it on the smart trainer, and while doing the calibration, some gears shift automatically when accelerating/reducing speed , specially in the smallest cogs, so I am trying to understand why and these are a few of my hypothesis:
- Do I need to put some lube on the chain? Looks like it doesn’t need, but can this be the problem?
- Do I need to adjust something in my bicycle’s gears?
- If there is a compatibility problem, is there a cassette that you know would be for sure compatible with my bike?
- If not, what sort of adjustment can I make? Do I need to get a derailleur / everything of the same brand?
Any help you can give is welcome as I am a bit clueless on the problem.
Thanks in advance!