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Current 1*11 sp chainring chain and cassette nearing end of life so looking at whether or not AXS might be an option on the road/gravel bike (2016 Santa Cruz Stigmata V2 CC)... Fancy it but cost prohibitive for a wholesale change atm.
1. Could I keep my postmount calipers and hoses and just change the shifters to Force 12 speed AXS? SRAM only do postmount calipers bundled with Red Shifters on the 12sp AXS as far as I can see.
2. Could I keep the Force 1 cranks (gpx in a converted/adapted pf30 bb) and just pop a new chainring on. I'd prefer same again (40t absolute black cx x1 oval nw chainring) but might consider 40 or 42 round nw chainring if oval doesn't play nicely with AXS
3. I know I'll need an Eagle AXS RD and Eagle chain to be able to run the range I want (current 10-42 on the road wheels, 11-42 on the gravel wheels). Don't want to run a lower gear than 40-10 on the road though at the other end could run anything from around 42-39/46 on the road/gravel wheelsets. Obviously road wheel has XD driver..I think that is OK for 12sp MTB cassette (but not 12sp road) with 10t cog. I presume standard shimano 11 sp freehub is ok for 12sp MTB cassette with 11t cog?
In summary could I get away with the following:
New Force or Red 12sp AXS shifters with current 11 sp hoses and calipers.
Current crankset and new 40T oval chainring
New Eagle 12sp AXS RD and new Eagle 12sp chain.
New 10-xx MTB cassette for the road wheel on current XD freehub
New 11-xx MTB cassette for the gravel wheel on current 11sp shimano freehub
Still spendy but at least I could look out for stuff as it crops up over the next few weeks/months if I knew what would work....
No idea of 1; 2 should be fine as the chainring is just that - a chainring; 3 should be fine on any appropriate speed cassette to fit freehub.
Axs is just electronic power to move things instead of mechanical power, so everything else is the same consideration as before.