Utilizing an Arise exclusive double ratchet system, the Arise ECHO Cassette Hub can handle high loads of torque. Despite the enormous power of the Echo Hub, the weight is incredibly low making it one of the lightest hubs on the market. The super lightweight hub shell and 7075-T6 alloy thru-axle choices create a nimble and featherweight body for the robust driver mechanism. The oversized bearings and driver make the ECHO hub as smooth and fast as it is deadly and powerful. Pair up with your choice of a 15mm or 10mm axle, you’ll be ready to get out there and put some serious laps times down. Driver: Shimano Mini HG, 5mm range - lockring included (cog not included)Material: 6061-T6 alloy refined hub shellAxle: 15mm thru axle or 10mm female axle (not included)Spoke Holes: 28h or 36hMeasurements: PCD: 58mm, DS flange offset (29.5mm), NDS flange offset (19.5mm)Weight:285g (10.5oz) - w/o axle370g (13.1oz) - w/ 15mm thru-axle385g (13.6oz) - w/ 10mm female axleBearings: 3x 18307-2RS bearings (18 x 30 x 7 mm), 1 x ACB41H6.5 (30.15 x 41 x 6.5 mm) Features: super light weight race-spec cassette hub Arise exclusive high-engagement ratchet system incredibly strong and reliable engagement system 6-bolt IS disc brake rotor mount larger oversize bearings for reduced friction and low rolling resistance compatible with 15mm thru-axle or 10mm female axle (not included) 28h or 36h options custom volcano bolts with deep set hex wrench includes Arise CNC alloy locking with oversize profile for longer life and tighter hold on the cog DOES NOT include axle or cog (lockring is included), thru axle size must be selected and added separately