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Sram MTB calipers use 21mm pistons and road use 18mm so they are not interchangeable. Shimano uses the same piston diameter for MTB/road so those are interchangeable. Any Sram road (Apex/Rival/Force/Red) HRD caliper will work with the AXS levers. They are pricey as new service parts so used or take-offs will be significantly cheaper.
Edit: I didn’t realize AXS switched to 21mm piston calipers. Check the most recent Sram spare parts catalog to check which connecting bolts are used with AXS and MTB calipers to make sure they are compatible.
Last edited by visusest; 12-07-2020 at 07:55 PM.
Reason: Wrong info
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