Park Tool - ST-3 - Socket Wrench Set 8, 9, & 10mm Sweats Technical:Upper Cup ZS44/30 ZS49/30 ZS56/30

Technical:Upper Cup           ZS44/30    ZS49/30    ZS56/30    EC44/40    EC49/40    ZS56/40Steerer Tube        30 mm      30 mm       30 mm      40 mm       40 mm      40 mmHeadtube Size      44 mm      49 mm      56 mm      44 mm       49 mm      56 mmStack Height        3 mm        5

The XDR driver is 1

1x TX 10 x 50 mm

Lightweight (less than 40g heavier than standard crankset)

Park Tool - ST-3 - Socket Wrench Set 8, 9, & 10mm Sweats Technical:Upper Cup ZS44/30 ZS49/30 ZS56/30PARK TOOL ST 3 SOCKET WRENCH SET 8, 9, & 10MM The three most common bolt and nut sizes are combined with the classic Park Tool 3 way Y body. 8mm, 9mm, and 10mm forged CR V steel sockets.