1-3/8" Bicycle Headset Bearing- 37x49x7mm - 45/45 Sealed1 3 8" Bicycle Headset Bearing 45 45 Angle 37x49x7mm Double Sealed Angular Contact This 1 3 8" headset bearing is an angular contact type with a 45 45 degree contact angle, ideal for bicycle steering systems that require precise alignment and smooth response. Made from durable chrome steel and sealed on both sides, it keeps out dirt and moisture for long lasting, low maintenance performance. Size: 37mm ID x 49mm OD x 7mm width Contact angle: 45 45 for