Shimano ultegra 6800 road brake caliper setbraking performance is one of the ultegra 6800 groupsets major advances evidenced by the inclusion of a revised standard caliper and front and rear aero brakes designed to provide optimum braking power and modulation when used in conjunction with slr ev brakeshift levers there are not many other options if you are looking for high end performance features material aluminium reach 51mm compatibility slr ev rim width 19 26mm max tyre size 25