Please beware that a few Chinese companies are selling cheap Dangerous versions of our Registered item.   They are cheap metal and very dangerous.   

You also must wait 3--5  weeks for delivery if you order the Chinese copies.  

WE send out same day from USA if you order before 1PM. ----------Thanks for buying USA !  

This is a standard 34 mm ISO center hole same size as all standard Hubs and freewheels(Shimano, SRAM, Formula etc.) with the standard ISO  44mm on center to center 6 bolt ISO rotor pattern.   

(WE also have the 48 mm version for people with European disc rotors that are 48 mm center to center for the 6 bolt pattern. ) ----------Can be used to change your flip flop hub or any other hub to Disc brake ready wheel !    Can also be used to install things to the other side of your hub like single speed freewheels etc.

Many people use as spacer for Freewheels to line up with chain line on FAT Bikes,  BMX,  Beach cruisers etc.

Many people use these for motor driven Bikes as a mount for the drive sprocket also.  

Made of 6061  T6  heat treated Aluminum very strong and durable.  Can be used as a lock nut for attaching things to either side of threaded hubs.    WE also have the double threaded hubs and both sizes of disc rotors (44mm  and 48 mm).

The Cheap Chinese copies are a violation of our US patent and they are made of cheap metal that is dangerous.