Aspero Apex Size:61 40T chainring Freewheel: 18T single

40T chainring Freewheel: 18T single speed freewheel

This cassette is built with a strategic application of aluminum

Cassette/Freehub Compatibility: MICROSPLINE (not compatible with standard HG cassettes)

Redesigned

Reflective sidewall stripe increases your visibility for oncoming motorists

Aspero Apex Size:61 40T chainring Freewheel: 18T singleIn 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,