The racers39 choice 105 brake callipers come in a compact and lightweight design for high performance low profile aerodynamic direct mount super slr ev dual pivot design provides superior brake performance and light action can be used on frames and forks with direct mounts must be used in conjunction with st 5800 st 6800 or st 9000 stis for correct leverage ratio enhanced brake arch proportions give a quicker linear response and increased power low profile outer cable stop posi