Delta brakes Bicycle brake

a pair of campagnolo delta brakes

the delta brake road bicycle brake named due triangular shape. cable enters @ centre, pulls corner of parallelogram linkage housed inside brake across 2 opposite corners, pushing out @ other 2 corners on brake arms above pivots, arms below pivots push pads in against rim. feature of design mechanical advantage varies tangent function across range, of other designs remains fixed.

many consider brake attractive, , has lower wind profile other common brakes. however, bicycle quarterly criticized delta brake being heavy, giving mediocre stopping power, , suffering disadvantageous variable mechanical advantage. in particular, small parallelogram, pad wear causes mechanical advantage rise dramatically. however, high leverage, stroke of lever not enough apply brake, rider can have brakes feel normal in light braking cannot applied harder hard braking.

the basic design dates @ least 1930s. made prominently campagnolo in 1985, brakes based on same mechanism manufactured modolo (kronos), weinmann, , others.

they no longer made , uncommon.