Basic Disc Brake Adapter IS to Post Mount

Rever makes these adapters in Taiwan.  They're forged than machined, which makes 'em tough.  This is the adapter to get if you don't need a fancy fun colored anodized brake adapter.   Most steel framed ATB bikes have IS (international standard) brake mounts.  If you are looking at the mount from the side, you can see thru the two mounting holes for the adapter.  No one makes an IS brake any more, but the standard is useful because it's highly adaptable.   Adapters don't come with bolts to mount the brake to the adapter, or the adapter to the bike.  You can add 'em easily below.  Get 2 bolts if you just need to install the adapter to the bike, get 4 if you also need bolts to install the brake to the adapter.  These are high quality black oxide (strongest bolt for this application)  bolts with a captured washer and loctite already applied.   Here’s the code for figuring out what size adapter you need:  160mm front rotor: +0 adapter 180mm front rotor: +20 adapte