Shimano Dura Ace Di2 R9200/R9250 Groupset

Here is a full breakdown of the key specifications and features of this world-class groupset:

Crankset (FC-R9200)

• Chainrings: 50/34T. This “compact” combination provides a wider range of gears, making it ideal for hilly terrain and recreational riding while still offering plenty of speed on the flats.
• Crank Arm Length: 172.5mm, a common size that provides an excellent balance of power and comfort for many riders.
• Material: The crank arms are made from lightweight, hollow aluminum, using Shimano’s Hollowtech II technology for optimal stiffness and power transfer. The large chainring uses Hollowglide technology, which maintains strength while reducing weight and improving front shifting.
• Weight: The average weight for this specific crankset (50/34T) is approximately 685 grams.

Drivetrain & Shifting

• Shifting Technology: The R9250 is part of Shimano’s Di2 (Digital Integrated Intelligence) family. It features semi-wireless shifting, where the shifters communicate wirelessly with the front and rear derailleurs. The derailleurs themselves are wired to a central battery, which provides a more reliable power source and a longer battery life.
• Cassette: The groupset is 12-speed, giving you more gear options. It’s compatible with both the new Shimano 12-speed freehub bodies and existing Shimano 11-speed road freehubs.
• Front Derailleur (FD-R9250): The front derailleur is remarkably fast, with a 45% quicker shift time than the previous generation.
• Rear Derailleur (RD-R9250): The rear derailleur is the heart of the system. It houses the system’s charging port and wireless unit. It is also 58% faster than its predecessor and features a single cage length compatible with cassettes ranging from 11-28T to 11-34T.
• Chain: The groupset uses the super-light and durable 12-speed chain with Hyperglide+ technology, ensuring seamless and quiet shifting even under maximum pedaling load.

Braking System

• Brake Type: This groupset comes with a hydraulic disc brake system.
• Calipers (BR-R9270): The mono-body caliper design drops weight and provides increased pad clearance, which reduces the chance of rotor rub and ensures a quieter ride.
• Brake Levers (ST-R9270): The shifters are a work of ergonomic engineering, with a refined shape for better grip and control. They utilize Servo-Wave Action to provide incredible modulation and power.

This groupset is for the uncompromising cyclist who demands the fastest, most precise, and most reliable performance on the road.