The racers choice 105 brake callipers come in a compact and lightweight design for high performancedual pivot calliper brake with super slr ev design for quick linear response increased rigidity and improved braking powermust be used in conjunction with st 5800 st 6800 or st 9000 stis for correct leverage ratioenhanced brake arch proportions give a quicker linear response and increased powerlow profile outer cable stop position improves cable routing for reduced frictioncartridge brake shoes