Giant S-R3 AC Tire Color:Black/Reflective 30t XS: 165mm (27

30t XS: 165mm (27

- Integrated frame features include built-in U-lock fit

The Di2 actuators in the front and rear derailleurs of the current Ultegra series enable a significantly higher movement speed for a shorter movement time when changing gears and correspondingly rapid shifting processes

Compatible chain HG 12-speed

the only lighter way of getting home after a flat tire might be to call a cab

Giant S-R3 AC Tire Color:Black/Reflective 30t XS: 165mm (27With their grippy tread patterns and high volume casings, Giant's P R3 AC Tires offer superior handling and a superb ride. Giant's Deflect 3 nylon breaker keeps pinch flats at bay and the handy built in wear indicator lets you know when it's time for new rubber. And, they have reflective sidewalls for increased visibility.