Shimano tiagra 4600 road brake calipersuper slr dual pivot design keeps operating friction to a minimum improving braking performance features must be used in conjunction with st 4600 st 4603 st 5700 st 5703 st 6700 or st 7900 stis for correct leverage ratio enhanced brake arch proportions give a quicker linear response and increased power lightweight aluminium caliper design with tough anodised finish toe in adjustable brake shoes for perfect pad alignment durable quick release for fast a