The shimano tiagra st 4600 double 10 speed road sti levers is another fantastic shimano shifter with the latest design features the tiagra is super comfortable aero dynamic and strong in the performance department the levers themselves are designed in a way to ensure that shifting and braking is easy regardless of your hand position and when combined with the unique rubber material you are always comfortable in any riding condition ease of use is another big benefit of the tiagra st 460