The Dia-Compe 505Q is a high-quality, lightweight brake designed for classic and modern bikes.

Crafted from cold-forged aluminum, the 505Q has a reach of 45-57mm and delivers reliable stopping power with minimal flex. It features a twist-style quick release for fast wheel changes, and comes in your choice of polished silver or anodized black.

Weighing in at just 146g, this brake combines performance, classic aesthetics, compatibility with a wide range of vintage frames, and is ideal for vintage-inspired builds.

ⓘ Please note: These calipers have an old school nutted mount—NOT A RECESSED NUT—and it is not our fault if you don't read this or look at the photos and order a caliper won't work with your frame and/or fork.