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Shimano's Di2 electric drivetrain takes shifting to the next level. Two Di2 Battery Chargers are available. Choose the model designed for your system's battery. An additional power cable is required for the external-style battery charger (sold separately). These chargers fully charge the battery in 90 minutes.

The Airstryke II takes the features of the ever popular Airstryke and adds an expanded fit range and more comfortable armrest. The flip up bracket and classic shape are retained. Performance The Airstryke II is intended to allow riders to add aerobars to their road or adventure bike without sacrificing the ability to hold the bars close to the stem. The comfortable grip angle and smoothly curved armrest offer a relaxed position for long days in the saddle. Fit Data - Armrest Offset: -85mm to 17.5mm in 7.5mm steps - Armrest Width: 131mm to 298mm in 18.5mm steps - Armrest Stack: 40mm Origin As one of the most popular model in the history of aerobars it seemed appropriate to update the much loved Airstryke with our new generation fit range and comfort focused armrest. We didn't want to change the elements that have made the bar so successful and the changes made just enhance the adjustability and comfort. - Bracket: L2 Flip-Up - Clamp Diameter: 31.8mm (26.0 w/Shims) - Armrest: Ergo Armrest - Armrest Stack: 40mm - Reach: -85mm to 17.5mm in 7.5mm steps - Extension Adjustment: 150mm (center of basebar - end) - Armrest Width: 155mm - 203mm - Weight: 592g

- Black carbon fiber weave headset spacers for tuning ride height, no logos - Kit includes 1-1/8" spacers: (15) 2.5mm, (25) 5mm, (16) 10mm, (2) 15mm, (4) 20mm

Profile Design's aero-bar extensions are made of feathery light carbon fiber, come in different bends to suit all riding positions and feature the standard 22.2mm diameter to fit Profile and other brand base bars and extension mounts (base bars and mounts sold separately). The T4+ model has a shallow-angle ski bend suitable for triathlons and time trials. They are also drilled for internally routing your cables.