The 2015 Trek S 4 is a 19 pound a road bike with a carbon Ultralight 300 Series OCLV / E2 frame. The frame has a  Trek  Black  /  Trek  White finish.

The S 4 is a is a light bike at around 20 pounds. It was released in 2015 and costs $1,649 brand new. The S 4 is fully rigid.

Components

The S 4 comes with Shimano Tiagra components, including a Bontrager Race Lite stem, an integrated sealed headset and Shimano Tiagra shifters.

Drivetrain

The S 4 has 10 speeds and has Shimano Tiagra rear cogs and a Shimano Tiagra derailleur.

Wheels

It comes with Bontrager R1 Hard-Case Lite tires (622mm x 23mm) and rims.