Side-pull caliper brakes Bicycle brake

single pivot side-pull caliper brake.

single-pivot side-pull caliper brakes consist of 2 curved arms cross @ pivot above wheel , hold brake pads on opposite sides of rim. these arms have extensions on 1 side, 1 attached cable, other cable housing. when brake lever squeezed, arms move , brake pads squeeze rim.

these brakes simple , effective relatively narrow tyres have significant flex , resulting poor performance if arms made long enough fit wide tyres. if not adjusted properly, low-quality varieties tend rotate 1 side during actuation , tend stay there, making difficult evenly space brake shoes away rim. these brakes used on inexpensive bikes; before introduction of dual-pivot caliper brakes used on types of road bikes.

dual-pivot caliper brake.

dual-pivot side-pull caliper brakes used on modern racing bicycles. 1 arm pivots @ centre, side-pull; , other pivots @ side, centre-pull. cable housing attaches of side-pull brake.

the centering of side-pull brakes improved mass-market adoption of dual-pivot side-pulls (an old design re-discovered shimano in 1990s). these brakes offer higher mechanical advantage, , result in better braking. dual-pivot brakes heavier conventional side-pull calipers , cannot accurately track out-of-true rim, or wheel flexes side side in frame during hard climbing. common see professional racers climbing mountains quick-release undone on rear brake, eliminate drag source.