In 2009 Shimano brought electronic gear-shifting to road bikes, in the form of its Dura-Ace Di2 group. The slightly-less-pricey Ultegra Di2 system followed, although it was still aimed at roadies.

Shimano's entry-level road and mountain bike groupsets have been given a significant facelift as improvements to their higher-end offerings trickle down to the Tiagra and Acera groups for 2011/2012.

Shimano has been playing catch-up to archrival SRAM since single-chainring drivetrains became the norm on modern mountain bikes. Simplicity, lower weights, and the ability to optimize rear-suspension ...

We saw a lot of compelling bike gear at Sea Otter earlier this month. But the one innovation that sticks out more than any other is this hydraulic-shifting setup from German component maker Acros.

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