RK S55 BILLET PINNED CRANK HUB

DESCRIPTION

• 4 pin design to ensure the hub wont spin, even with heavily modified S55s
• Laser scanned to ensure perfect fitment – direct replacement for stock
• Designed and machined in-house on our HAAS 4-axis CNC mill
• Machined from heat treated 4130 Chromoly

Compatible with all S55 M models

• 2014-2018 F80 M3
• 2014+ F82 M4
• 2019+ F87 M2 Competition & M2 CS