🔄 Shimano Ultegra Di2 R8100 12-Speed Groupset
Shimano Ultegra Di2 R8100 is the second tier below Dura-Ace, sharing the same 12-speed semi-wireless technology at a lower price point. It is the dominant OEM groupset on premium road bikes in the $3,500–$6,000 price range, specified by Giant, Specialized, Trek, BMC, and Merida. Ultegra and Dura-Ace 9200 share identical derailleurs with different cage materials — an Ultegra derailleur can accept the same chain and cassette as a Dura-Ace build, enabling cross-tier mixed builds. This compatibility across price tiers is unique to Shimano.
Drivetrain
技术规格
| Type | 12-Speed Semi-Wireless Electronic Groupset (Di2) |
|---|---|
| Speeds | 12 |
| Shifting | Wireless rear / wired front |
| Cassette Range | 11-30T / 11-34T |
| Chainring | 50-34T / 52-36T |
| Weight | 2,311 g (complete R8100) |
| Battery | BT-DN300 (500 km per charge) |
| Manufacturer | Shimano Inc., Osaka, Japan |
| Msrp | $2,200–$2,800 (complete groupset) |