• Blackspire ReCOGnition Cassette Expander Sprocket

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Blackspire ReCOGnition Cassette Expander Sprocket

Great addition to your 1x drive train, with just the swap of one cog to your existing 10 speed cogset. Increases range to your drive train without breaking the bank. Pair this with a BLACKSPIRE Snaggletooth WP ring up front and your ready to ride.


  • For SHIMANO FC-M782, FC-M672, FC-M622 and FC-M612 96BCD cranks
  • For use with 10 speed drivetrains
  • Material: CNC'd 7075 T-6
  • Includes: Spacer and longer B’tension screw
  • Finish: Anodized with Laser etched Graphics


  • 40t - Shimano: SLX HG81 - Not Compatible/XT M771-10 (11-34t) - 15 or 17t/XTR M980 (11-34t) - 15 or 17t
  • 42t - Shimano: SLX HG81 - Not Compatible/XT M771-10 (11-36t) - 15 or 17t/XTR M980 (11-36t) - 15 or 17t
  • ReCognition 42t - SRAM: X0 PG-1080 (11-36t) - Not Compatible/X9 PG-1070 (11-36t) - 15 or 17t/X7 PG-1050 (11-36t) - 15 or 17t/X5 PG-1030 (11-36t) - 15 or 17t


  1. Remove the lockring and existing cassette from your rear wheel.
  2. Remove the stock 15 or 17t sprocket and one spacer from your cassette.
  3. Install the ReCOGnition 40T or 42T sprocket and then the spacer provided onto the freehub body.
  4. Install all remaining cassette sprockets and spacers. (There should be 10 evenly spaceds sprockets on the freehub body)
  5. Reinstall the cassette lockring and tighten it to the noted torque.

Buy Blackspire Components from Chain Reaction Cycles, the World's Largest Online Bike Store.

  • Delivery costFREE
  • Delivery toUSA
  • 365 Days return or exchange

    If you're not completely satisfied with an item you may return it within 12 months of purchase. We'll give you a full refund if the item hasn't been used or the component hasn’t been fitted.

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