Shimano SM-MA90 Disc Brake Adapter – Rear – 180mm

With the SM-MA90 Disc Brake Adapter, Shimano has taken an artful leap at the lowly disc brake adapter. Not only is it lighter than their older adapters, but it’s more refined — this refinement being the reason for its lightness. Where Shimano’s older adapters were blocky, this one has curved edges. Where they were solid, this one has a window machined out of the center of the adapter body.

– Rear Postmount

– 180mm Rotor