The racers choice 105 brake callipers come in a compact and lightweight design for high performancelow profile aerodynamic direct mount super slr ev dual pivot design provides superior brake performance and light actioncan be used on frames and forks with direct mountsmust 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 ro