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For 2010-2011 9 and 10-speed derailleurs
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Touch-screen: Unfortunately you'll need to take your gloves off to use your phone
Protective adhesive layer on the crank arms is a nice addition to prevent wear from your shoes
Pros: Excellent quality as can be expected from Park Tool
absoluteBLACK 4 Bolt Narrow Wide Chainring - 94 BCD - SRAM - Oval - Black - 9-12 Speed - 30T YGroup_7033421266989 For 2010-2011 9 and 10-speedabsoluteBLACK is dedicated to producing the world's finest oval chainrings and were the first to crack the code to discover the correct shape and 'clocking' to make an oval chainring work. They learned how to maximize the part of the stroke where power is produced and minimize resistance where it isn't which has the effect of smoothing out the delivery of power throughout the pedal stroke and improving efficiency. Many other brands have followed suit
