Prestacycle UniBlock PRO Cassette | 11-Speed Shimano / SRAM /Campagnolo for HG 12 Freehub



  • SHIFTING: Shimano, SRAM & Campagnolo
  • FREEHUB: HG12, HG11, HG10 only
    (HG10 Requires our HG10 Lockring, not included)


  • ARC™ Maximum Performance 11 Speed Shifting
  • Ultra-Strong ChroMoly 3D Structure
  • Ultra-Light – less material needed
  • Larger, better-distributed Freehub engagement
  • Easier to Clean
  • Red alloy locknut included
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Prestacycle UniBlock Pro Cassettes

Prestacycle UniBlock Pro Cassettes are a single-piece unit machined from a solid block of cold-forged Chrome Molybdenum alloy steel, then heat-treated, tumble-finished and electroplated for added durability and low-friction operation.  ChroMoly alloyed steel is significantly stronger than materials used in other Cassettes including top-end OEM Cassettes and will last longer.  The single block design offers 3D structure to optimize strength and distribute forces.  This allows Prestacycle to remove more unnecessary material, making our cassettes lighter than even top Manufacturer models that use fast-wearing aluminum big cogs.

Greater Freehub Engagement, Smoother Operation

Single block design insures the freehub has MORE engagement no matter what gear your are in.  Single cogs from other Cassettes can cut-like-a-knife into freehubs.  By increasing and distributing engagement across the entire freehub in any gear, we are reducing torsional loads thus reducing freehub wear and insuring lowest rolling resistance within the freehub.  This also makes our Cassettes the safest to use with high-end alloy freehubs.  Without any spacers in UniBlock, there is nothing to loose, and nothing you can install incorrectly.  Faster cleaning on and off the bike, with quicker, mistake-free installation insures you are ready-to-go!

New ARC™ (Advanced Radial Curve™) Shifting Technology

Prestacycle introduces UniBlock Pro cassettes with ARC™ Shifting tooth profiles.  UniBlock Pro ARC™ is our own unique, all-new shifting profile that provides shifting characteristics equaling or improving upon shifting performance for every major brand.  We’ve performed extensive analysis of all major shifting systems.  Our results show that due to how narrow chains have become, chains offer only small differences that contribute to shifting performance.  Meanwhile, a great deal of varying technologies exist in cassette tooth profiles from major drivetrain manufacturers creating different specific benefits in one system or another.  By examining the demands and benefits required by each particular drivetrain, we’ve been able to create a new system with the benefits of all drivetrains using one new design, creating all advantages to all systems.  Our new design facilitates the fastest, smoothest possible shifting to all systems while minimizing the impact to power delivery.

Going deeper, we’ve optimized every single tooth pairing on every cassette.  A shifting profile from a 16T-to-17T cog is different from a 15T-to-17T cog on a different cassette.  These exact-match pairings for both up-and-down shifts provide the highest possible speed and reliability in shifting.  Even shifting under load is maximized.  Our new Professional cassettes create a new generation of compatibility and enhanced shifting performance.

HG12 Profile – fewer teeth, more surface contact

Prestacycle UniBlock Pro’s Unique HG12 interface is compatible with all HG12, HG11 and HG10 Freehubs.  Wider inner and outer freehub teeth maintain engagement at all points in all gears and create an overall increase in freehub contact, despite having fewer teeth.  UniBlock Pro Design enhancements also allow adapting newer standards to old, such as adding 11 & 12 speed to Shimano 10 speed wheels (with our optional lockring), or adding a shifting system to a wheelset or direct drive trainer that does not otherwise support that drivetrain.

Installation notes:

  • Not all derailleurs are compatible with all gear ranges.  Please verify if your derailleur is compatible with the largest tooth size, and cog gaps that you are ordering.  Electronic shifting systems are the most picky about working with gear ranges not offered by the Original Manufacturer.

Additional information

Weight 1 lbs
Dimensions 5 × 5 × 3 in

11-23T, 11-25T, 11-27T, 11-28T, 11-29T, 11-30T, 11-32T, 11-34T, 12-25T, 12-27T, 12-28T


Did you know?

Did you know, you can purchase a lockring that adapts your Shimano 10 speed freehub to accept our 11 and 12 speed UniBlock Cassettes? Well, you can! Simply replace the lockring that comes with the UniBlock Cassette with our HG10 for 11-12 speed lockring and you have made a serious upgrade!

Prestacycle Shimano HG10 Lockring for 11-12 speed Cassettes


Prestacycle warrants all UniBlock and UniBlock Pro Cassettes manufactured by Prestacycle to be free of defective material or workmanship for one (1) year, and under the conditions stated herein. This warranty is expressly limited to repair or replacement of product found to be defective. Prestacycle assumes no liability for loss due to failure of any product to perform satisfactorily. Prestacycle makes no other warranty, expressed or implied, except that of title. Any and all other warranties are expressly disclaimed.

This warranty applies under conditions of intended use and is exclusive of equipment subjected to: Failure to follow recommended assembly and service procedures, Lack of proper maintenance, excessive duty cycle, exposure to the elements, shipping damage and modification not authorized by Prestacycle. No warranty claims will be honored without prior authorization for repair from Prestacycle. Any replaced or repaired equipment will be warranted for the remainder of the warranty term only.


No warranty is provided for wear due to use or mileage.  Variations of operation due to multiple brands of equipment, chain wear and installation and set-up can significantly impact wear of all bicycle components.  In addition to normal wear and tear, damage resulting from a collision; improper installation, operation or service; and use of incompatible or modified parts, and/or riding or installation in conditions or applications other than recommended is not covered under warranty.

Visible defect:

Defective Cassettes are return-for-replacement if they have a visible defect.  Please use “Contact us” to provide a photo of the visible defect and receive a pre-paid return label.

Operational Concerns:

Operational concerns must be diagnosed and confirmed by our Technical staff.  Please contact us using the “Contact us” link on our Website.    Please note that installation of a New Cassette, even from the same or an OEM vendor always requires a new chain and re-set-up of the derailleurs as-per Shimano/SRAM/Campagnolo’s recommendations.  All cassette installations must follow set-up instructions provided by the drivetrain manufacturer.


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