FSA Gravity 4 headset (1 1/8")

For through 1.5" head tube in conjunction with a tapered steerer tube (1.5"-1 1/8")

• upper bearing ball race 7/32" x 20, lower bearing ball race 1/8" x 30
• inside ø head tube 49.57mm
• outside ø head tube 55mm
• forged steel bearing shells with 20mm offset