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why has it only got a single crankest
Welcome to 2014 - the year everybody finally realised that we used to be perfectly happy with 10 different gears over a 3:1 range for the vast majority of riding. 1×10 with a 12-36 cassette is actually a better way to arrange them than the old 48/36×14-28. It shifts better, you get all the gears in sequence without double-shifting, and you can bin half the crap which used to break or seize up.
why has it only got a single crankest, wouldn't that badly limit the range?