The S5 Ultegra Di2 delivers the same benchmark aero chassis with Shimano’s trusted 12-speed wireless shifting. It keeps the handling poised, the ride fast, and the build practical for riders who want pro-level speed with Ultegra value.

Why we rate it

• Wind-tunnel-proven front end and integrated HB19 cockpit for real-world speed.
• Reserve 57|64 wheelset balances aero, stability and durability.
• Ultegra Di2 12-speed with dual-sided power for training and racing.

Specifications — Ultegra Di2