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Choices for following:
-Hub Color/Spoke holes
-Cassette Driver


“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 MTB Disc Brake 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 thru axle 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!

-Cassette driver options include HG 9/10/11 spd or XD 11/12 spd. (Micro Spline available soon)

-The Profile Racing AC-2 hubs and cassette drivers are manufactured from a high grade, aerospace quality billet aluminum.

-Front and Rear hubs sold separately.

Ceramic Hybrid bearing option available for hub shell bearings.

-Standard MTB BOOST 148mm x 12mm thru axle.

-ISO Standard 6 bolt disc brake mount.

-Made in the USA!

Spoke Holes: 28h, 32h

Anodized Colors: Black, Silver, Red, Blue, Gold, Purple, Green, Matte Black

Axle End Caps : 148mm x 12mm thru

Cassette Drivers: HG 9/10/11 SPD, XD 11/12 SPD

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

Weight: 326g/11.41 oz



Additional information

Weight 1.5 lbs
Dimensions 6 × 6 × 6 in


We are taking precautions to protect our employees and follow CDC and state guidelines. In the meantime, our machine shop is still running, we're here to assist you and we'll be shipping product to help support bike shops during this difficult time.