“AC-2” = Dual Angular Contact. This describes the use of both angular contact bearings and angled bearing cups/hub bores used in the hub design.

The AC-2 hub features revolutionary bearing installation and function never seen before in a bicycle hub.

It has been designed from the ground up for ease of maintenance and optimal bearing performance.

The AC-2 Cassette Hub also offers changeable pawl/spring configurations for varying points of driver engagement to suit a rider’s personal preference.

Here are a few key points of the AC-2 BMX Cassette Hub:

-The AC-2 hubs use 20mm Angular Contact bearings with a wave spring pre-load. Bearings are pressed into tapered cups that mate with the angled bores machined into the hub shell. This design feature allows bearing/cup to be easily installed and removed from hub shell without any special tools. No more presses or hammers needed! Another attribute of the tapered bearing cup/angled hub shell bore design is how the bearings seat in the hub. The bearings/cups on each side of the hub shell are in perfect alignment with each other! This ensures superior bearing performance and less chance of premature wear.

-Hub shell and driver literally “float” on the axle. The only force on the bearings is supplied by the wave spring(which delivers the appropriate bearing pre-load needed for angular contact bearings). Tightening of axle bolts has absolutely no affect on the bearings!

-The bearings, wave spring, and shim(s) are secured on the axle by one retaining ring. The only tool used to assemble/disassemble the AC-2 hub is a pair of snap ring pliers!

*Profile Racing does offer a simple tool to aid in retaining ring installation and bearing/cup removal, but is not necessarily needed.*

-The AC-2 hub cassette driver is also unique. It allows for changeable P.O.E.(points of engagement). The hub driver comes standard with 6 pawls and springs. This option offers 96 P.O.E. -Maximum engagement. The other choice is to use just 3 pawls and springs. P.O.E. is reduced to 48 and minimal drag is achieved. This is a rider preference choice and both have a unique sound!

-The proprietary Profile Racing 10 spline aluminum cassette body allows you to use our standard steel, Elite, or aluminum cogs ranging from 12t to 18t.

-The AC-2 BMX hub has a true 20mm bolt-on hollow aluminum axle.

-You have a choice of either 10mm socket head bolt(steel or titanium), 10mm button head bolt(steel or titanium)

-The Profile Racing AC-2 hub is manufactured from a high grade, aerospace quality billet aluminum.

-Standard BMX 110mm width.

-RHD only

-Made in the USA!

Spoke Holes: 36h

Bolts: 10mm Chromo Bolt with Volcano Cone, 10mm Chromo Button Head Bolt

Bearings: Steel 20mm angular contact, Ceramic Hybrid 20mm angular contact

Weight: 325g/11.45 oz (weighed w/15mm bolts & no cog)