Rear wheel Shimano GRX RX880-TL-R12 12s Micro Spline 12x142mm

SHIMANO RX880 carbon wheels are 64 grams lighter per pair than their predecessors and feature the same shallow 32 mm rim height for faster acceleration and quicker climbing. The low profile also ensures better control in cross winds, and these tubeless wheels employ a modern 25 mm inner rim width suitable for tires up to 50 mm wide. Borrowing from DURA-ACE wheels, the RX880 receives a DIRECT ENGAGEMENT freehub construction for added driving rigidity. 
 

・32 mm full carbon rim
・Recommended tire size: 32-622 - 50-622
・Two replaceable freewheel body options
 »HG spline L2 and MICRO SPLINE
・Modern 25 mm inner rim width
・24 J-bend spokes front and rear