there are very little info regarding the pitch of the new 12 speed SRAM AXS cassette, but it seems that 3.65mm is the number. if the pitch of a shimano 11 road cassette is 3.69, may be possible to just change the hub (an XDR hub adapter is 49EUR), put an AXS cassette (force 1270 is 139EUR) and a 12 speed chain (24EUR) on my ultegra 11 speed setup and have "the poor man's mechanical 12 speed" ? if the numbers regarding the cog pitch are correct, is the 0.04 mm difference important? does the 12 speed SRAM chain need a special pulley on the rear derailleur? on paper seems quite possible, but....
There’s a lot of conflicting information about AXS comparability, so unless someone has tried this it’s going to be hard to get a good answer. What I don’t understand is how you are going to shift across a 12 speed cassette with 11 speed shifters.
ljsmith wrote:There’s a lot of conflicting information about AXS comparability, so unless someone has tried this it’s going to be hard to get a good answer. What I don’t understand is how you are going to shift across a 12 speed cassette with 11 speed shifters.
Bingo. Your Ultegra shifter only has 11 clicks for the rear derailleur.
