These are 28 holesmall flange, flip/flop,loose ball bearingaluminum hubs.They willworkwith singlespeed thread-on freewheels that are 13t and larger.

• Small Flange Alloy Shells
• 100mm Front, 110mm Rear OLD
• Flip-Flop Rear with 30mmx1 and 1.37″x24t threads
• Black Ano finish
• Loose ball bearings and 3/8x26t axles

These are basic hubs and they may have some light shelfwear.