Shimano's Dura Ace R9250 Di2 rim brake groupset is the pinnacle of the brand's road technology, engineered for speed, smooth operation and sleek aesthetics. In this latest edition there are a number of changes including better ergonomics in the shifter for improved functionality and comfort in all hand position, faster shifting and, of course, the additional 12th sprocket. The longer cage derailleur length means that compatibility with 11-30 cassettes are fully supported. A carbon cage increases rigidity and lowers weight, while the corrosion-resistant cold-forges aluminium link plates of the derailleur body are strong and donate snappy gear changes. Hyperglide+ technology in the sprockets and chain mean that the two mesh better, essentially improving shifting under load, across the cassette.
Shimano Dura Ace Di2 R9250 12 Speed Rim Brake Groupset includes
- Crankset: Shimano Dura Ace FC-R9200
- Bottom bracket: BB-R9100 Dura Ace bottom bracket English cups or BB9241B Shimano Road press fit bottom bracket for 86.5mm
- Shifters: Shimano Dura Ace ST-R9250
- Brake callipers: BR-R9200 or BR-R9210 direct mount callipers (front and rear)
- Front Derailleur: Shimano Dura Ace Di2 FD-R9250
- Rear Derailleur: Shimano Dura Ace Di2 RD-R9250
- Cassette: Shimano Dura Ace Di2 CS-R9200 11-30 or 11-34
- Chain: Shimano CN-M9100 Dura Ace 12 speed
- Various cable options
- Shimano BT-DN300 Di2 Internal Mount Battery
- Shimano EW-EC300 Battery Charging cable