When Chris King decided to design a thru axle front hub, they had a simple goal make the best hub money can buy. With the Chris King ISO Disc 20mm Thru Axle Front Hub, they just might have done it. The 20mm Thru Axle Hub utilizes a special bearing, almost the size of a headset bearing that King designed for this very purpose. The custom bearing was needed because King designed this hub to have an axle, supported by the bearings, that a 20mm thru axle slides through. The reason is toughness. A great side effect is that you'll never, ever, ever lose an end cap when you transport your wheel off the bike. The lightweight aluminum axle is protected by stainless steel endcaps to offer durability that will last until the world ends. And if you can see past it's toughness, this hub is as beautiful as the rest of King's parts. The Chris King ISO Disc 20mm Thru Axle Front Hub is configured for 20mm x 110mm thru axles. It has 6 bolt ISO brake rotor mounts. For those of you building your own wheels, the flange diameter is 57. 6mm, and the center to flange distance is 31. 2mm on the right and 23. 1mm on the left. And, for those who want to go bigger and use this hub with a Maverick Fork, King's 24mm front axle can be swapped into place when needed. Or you can go smaller. Since this is technically a Chris King LD large diameter hubshell, you can use a Chris King 15mm Conversion Kit for LD Hubshell to convert it to use a 15mm thru axle.