The new 12-speed configuration offers two options when it comes to cranks and rear derailleurs and they are dependent on whether you want to ride 1x or 2x in the front.
The rear derailleur for the 1x option can handle the new RD-M8100-SGS XT cassette with 10-51 teeth. The version for 2x can take the RD-M8120-SGS 10-45 tooth cassette. For both versions, the derailleur pulleys have 13 teeth and the rubber clutch keeps the chain quiet.
The cassettes - the only two versions offered for the time being - are made with an aluminium spider construction. Also, the two large sprockets are made of aluminium to save weight. Those who prefer smaller gear steps should head straight for the 10-45 t cassette. If you are looking for range, then the 10-51 t cassette is the answer.
Choosing 1x or 2x has its effect on the cranks you can use. For example, the 1x cranks are outfitted with a direct mount system and offer 28, 30, 32, 34 or 36 tooth chainrings. This version is also the lightest option at 608 grams. The cranks are also available in a Boost and non-Boost standard.