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This GP headset bearing is a replacement sealed cartridge angular contact bearing for 1 1/8 Inch headsets. This features a step in the internal race for the conical expander (or crown race if used on the bottom) to fit into. It fits the majority of Specialized bikes from since about 2012. Also, fits some Focus bikes and more.
41.8mm External Diameter
Inner Race is stepped to allow the expander/race to fit in.
If you don’t want to get injured then I suggest that mountain biking is perhaps not the sport for you. There will be plenty of occasions when you overestimate your abilities and bleed. Or do one of my best...