Machined to the tightest tolerances. Onyx hubs use sprag internals for strength, extremely low rolling resistance and infinite points of engagement. All Onyx hubs come standard with ceramic hybrid bearings so there is no need to upgrade. Ceramic hybrid bearings 7075 Aluminum Hub Shell Adjustable preload Titanium bolts Extremely low rolling resistance 5 year limited warranty Made in the USA Silent instant engagement 10 speed HG driver Hardened heat treated stainless steel driver Optional alloy driver upgrade available Skewer Included: No Hub Drilling: 32 Bearing Type: Sealed Cartridge Center to Flange, Right: 24.17 Color: Black Hub/Brake Compatibility: 6-Bolt Disc Cassette Body Type: Shimano/SRAM 8, 9, 10 Speed Spoke Interface: J-Bend Center to Flange, Left: 36.9 Flange Diameter, Right: 60 Defined Color: Black Flange Diameter, Left: 60 Rear Axle: 12mm Thru x 148mm