Well, that's where the Battery Stem comes in. Created by South Korean startup PiBike, the water- and dust-resistant Battery Stem is simply a 100-mm handlebar stem with an integrated 10,000-mAh ...

Mark Cavendish worked with HTC Columbia component suppliers PRO to develop this signature bar (£74.99) and stem (£149.99). If you value your watts and want a sprinting edge, look no further.