Bikerumor covers Shimano's debut of the new Dynasys drivetrains at the 2010 Sea Otter Classic. Debuting on 2011 model year XT and SLX, they combine revised gearing ratios on the front chainrings with a new 10 speed cassette that uses a massive 36T upper cog. Shimano's goal is to create more usable gears while keeping you in the bigger rings up front, which leads to less drag and more efficient pedaling and suspension performance. Get all the details and lots of photos at Bikerumor.com!
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