Quadrant Ring™ by NSB April Fools 2018

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=I2eQ34rGXdM

The age of the round chainring is over.Through an exhaustive R&D process to refine the oval chainring we discovered that optimum pedaling efficiency didn't c...

video, sharing, camera phone, video phone, free, upload
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