Avid Post Mount Brake Adapter $20.00
Avid's 10, 20, 30, and 40mm Brake Adapters include bolts and spacers to fit a variety of Post Mount configurations. To find the correct components, pick a rotor size and fork/frame interface then reference either Sram's caliper mounting and spacer configurations doc or the tech specs to the side.
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My 2012 Specialized Stumpjumper HT is 140mm...
My 2012 Specialized Stumpjumper HT is 140mm post-mount rear with the 20mm spacers on it to work with the 160mm rotor/Avid Elixir 7s that came stock on the bike. I'm swapping the brakes out for Shimano XTs with 160mm rotors. Can I just continue to use the Avid spacers that are already on the post mounts? Do I need to get the Shimano-specific post-mount adapter?