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puncture-resistant tires
5-base lens curvature
designed to fit a variety of Shimano brakes
or Triathlon bicycles
Aspero GRX RX820 12 Speed puncture-resistant tiresIn 2019, spero took the gravel world by storm, heralding a new era of speed in gravel. Fun, but flat out. The new spero remains true to its original brief, but with some improvements: a threaded BB shell, neater cable routing, and a UDH compatible derailleur hanger for those who want to use SRAMs Transmission drivetrains. And its more aero, of course. In the case of spero, aerodynamic performance is less about pure speed as a result of drag reduction,
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