I was only considering the Ultegra 11 speed (r8050) which is still available, new in some online outlets and 2nd hand on ebay. Definitely not keen on sacking the existing setup for a brand new 12 speed.rareposter wrote: ↑7 Dec 2023, 12:03pm
This is getting tricky because 105, Ultegra and Dura-Ace Di2 is all 12-speed so you're not going to get a 12-28 11-speed cassette working with it. That's just not going to happen.
As you say, Grx is only recommended for cassettes with an 11t top gear.