Surly New Hub Singlespeed QR disc front hub Standard axles 9 x 1mm front, 10 x 1mm rear skewers not included Forged then machined, medium flange Adjustable, fully sealed bearings. Uses same bearings frontrear Cartridge bearings are installed with black seal facing out blue side facing in towards the hub Forged and CNCmachined, highflange body Adjustable, sealed, fullcompliment, angularcontact bearings same 7901 bearings used front and rear
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