Originally Posted by
Dom87SS
i have no idea what the adapter is, i bought these off a guy i know. ill go take a look later
The adapter is the bit that connects your brakes to your frame/fork. Differing sizes depending on what brake caliper and rotor size you are running.
Avid brakes have standard sizes of 160, 185, and 203mm. You've got 180mm Tektro rotors there, thus the question. Either you've got some non-Avid adapter in use, or you're going to get uneven pad contact on your rotors due to the 5mm smaller rotor size. Or whomever you bought the brakes from shaved down the adapters you have to make things work properly.