Product features

Shimano Ultegra Di2

Ultegra Di2 R8100 is Shimano's most inspired drivetrain, packed with innovative, game-changing features. HYPERGLIDE+ technology allows for crisp, seamless shifts both up and down the gear range, even during maximal efforts. The new Di2 shifting system introduces Shimano's exclusive wireless integrated circuit, and the move to a 12 speed cassette ensures you have all the gearing you need. Ergonomics and aerodynamics have been enhanced at every turn, and you can set up the drivetrain just the way you like it via Shimano’s user-friendly E-Tube app.

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Hollowtech II

Balancing stiffness and power transfer against overall component weight is a chief concern for any crankarm design. Shimano's Hollowtech II technology integrates the bottom bracket axle with the right crankarm for more stiffness and weight savings to achieve a high-dimensional balance. Its 24mm diameter, outboard bottom bracket bearing system provides better weight distribution and more pedaling stability, allowing for more efficient power transfer.

Size	165mm, 34x50t	170mm, 34x50t	170mm, 36x52t	172.5mm, 34x50t	172.5mm, 36x52t	175mm, 34x50t	175mm, 36x52t
Length	165mm	170mm	170mm	172.5mm	172.5mm	175mm	175mm
Teeth	34x50t	34x50t	36x52t	34x50t	36x52t	34x50t	36x52t
Speed	12 HG+	12 HG+	12 HG+	12 HG+	12 HG+	12 HG+	12 HG+
BCD	110mm	110mm	110mm	110mm	110mm	110mm	110mm
Chainline	44.5mm	44.5mm	44.5mm	44.5mm	44.5mm	44.5mm	44.5mm
Offset	Standard	Standard	Standard	Standard	Standard	Standard	Standard
Crank type	Shimano Hollowtech II	Shimano Hollowtech II	Shimano Hollowtech II	Shimano Hollowtech II	Shimano Hollowtech II	Shimano Hollowtech II	Shimano Hollowtech II
Threading	9/16"(15mm)	9/16"(15mm)	9/16"(15mm)	9/16"(15mm)	9/16"(15mm)	9/16"(15mm)	9/16"(15mm)
Material	Aluminum	Aluminum	Aluminum	Aluminum	Aluminum	Aluminum	Aluminum
Weight	700g	700g	711g	700g	711g	700g	711g

We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, materials, and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice. Prices shown are manufacturer's suggested retail prices.

Weights are based off pre-production products at time of publication. Weights may vary in final production.