I apologize in advance for what may seem like a beginner’s question.
I recently purchased the Zwift Hub, which comes with the pre-installed 12-speed cassette. I’m encountering an issue when mounting my road bike onto the Hub.
Despite attempting to make micro-adjustments to the rear derailleur, I’ve been unable to achieve smooth shifting or a quiet drive chain. This issue persists whether I adjust to the extreme “minus” or “plus” ends of the micro-adjustment scale and is particularly problematic when shifting to the extreme gears—i.e., the very large or very small cogs. I have Ultegra Di2, for reference.
For context, my road bike originally features a Shimano Ultegra 11-32 rear cassette, while the Zwift Hub is equipped with their standard 12-speed cassette.
My question is: What steps can I take to improve shifting performance on the Zwift Hub? While I’m willing to make slight micro-adjustments when switching between the rear wheel and the Hub, it doesn’t seem reasonable for the Hub to produce so much noise and offer such imprecise shifting.
Thank you for your assistance.