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I've been thinking about this a lot recently. My gravel bike is pretty hefty and even a kg matters when I'm travelling abroad with it, so I've been looking at the last gen Red 22 mechanical options (which I have on my best road bike and is also my favorite group ever for various reasons).
I have a 9-42 ethirteen 11sp cassette that I was thinking of putting with a 38 at the front with a Force 1 derailleur - this would give a good range for most road and gravel use. Alternatively, the ratio kit would allow 12sp, but would involve buying a new cassette and I've always been wary of these shift adapters (had fails with a jtec some years ago).
My main decision is red 22 hrd vs cable. I've got some Juintechs already, and hrd Red 22 shifters are also pretty pricey and heavier, whereas cable can be bought for fairly cheap these days. Might also give an excuse for daft Klampers/Growtacs. I've only recenly moved to hydro Ultegra from the Juintechs and I'm underwhelmed by the performance increase and annoyed at the bleeding/hassle when changing bars etc.
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@PhilDAS
Ratio have created an upgrade kit for SRAM 11 speed shifters to convert them to 12 speed, compatible with Shimano 12s cassettes. Could be a very affordable option for those looking for the range and smaller jumps of 12s without having to ditch their old group. Especially as 11 speed parts eventually become more expensive or difficult to source, granted not the case at the moment
https://ratiotechnology.com/product/2x12sh-upgrade-kit/