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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 OCLV Carbon Mono Bar Extension delivers an even more aerodynamic leading edge to Trek's drag-defying Speed Concept (Gen 2). These straight and S-Bend extensions are designed to be cut to length and have internal routing for standard or Di2 cables. - Designed specifically for 2014 Speed Concept - OCLV Carbon fiber mono extensions - Straight and S-Bend extensions are designed to be cut to length - Internally-routed for Di2 and standard cables - Designed to accept 22.2mm standard extensions

Gain an aerodynamic advantage with Origin-8's Tri Clip-On Aero Bars. These aluminum clip-ons fit a wide range of handlebars. With independent arm rests and bar-angle and reach adjustments, it's easy to get a great-fitting aero setup.

Shop kit of bearing retainers for loose-ball headsets, hubs and bottom brackets. - Bottom bracket: 1/4x9=12; 5/16x9=16 (#64); 5/16x10=16 (#66), 5/16 x 12 (Qty 4) - Bearing retainer assortment in all the popular sizes for headsets, hubs, and bottom brackets; includes plastic organizer - Hubs: 3/16x7=8; 1/4x7=16 - Headset: 5/32x22=8; 5/32x16=8; 3/16x16=8; 5/32x20=24

105 piece assortment of 1-1/8-inch aluminum headset spacers. Kit includes: - 1.5mm (Silver) qty. 15 - 2.5mm (Silver) qty. 15 - 5mm (Silver) qty. 15 - 7.5mm (Silver) qty. 5 - 10mm (Silver) qty. 5 - 1.5mm (Black) qty. 15 - 2.5mm (Black) qty. 15 - 5mm (Black) qty. 15 - 7.5mm (Black) qty. 5

Cassette spacers, bottom bracket spacers and hardware for HollowtechII, GXP, BB30/PF30. - Comprehensive shop kit for bottom bracket and cassette/freewheel spacing needs - 120 pc. kit in durable plastic storage box