CSMZ903 Cassette (12-Speed)
CSMZ903 Cassette (12-Speed)

CSMZ903 Cassette (12-Speed)


Regular price$127.99

Free shipping on all orders over $49. $9 shipping for orders under $49.

Cannondale, Santa Cruz, Cervelo, Gazelle, BMC, and *other bikes ship for FREE, but Gold Label Assembly will be added at checkout for only $79 (reg. $100) to cover the professional bike build and re-packaging by our certified technicians. It’s bike shop quality, direct to your door!

Some bikes not eligible for shipping due to manufacturer restrictions.

Shop with confidence! It's important to us that you are happy with your Mike’s Bikes purchase so we offer offer a 30-day return/exchange window for your unused gear and 14 days on all bikes. Our exchange and return process is fast and easy. If you choose to exchange for a different size or color, we will ship your product for free.

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  • Lightweight wide-range mountain cassette compatible with HG 8-11sp freehub bodies
  • Fluid Drive Plus shift enhancing design
  • 7075 aluminum largest 3 cogs, all other cogs are steel
  • 7 cogs on 2 aluminum spiders, aluminum lockring and spacers
  • Compatible with Shimano 12-speed drivetrain


  • 12-Speed Wide Ratio
  • Cogs: 11,13,15,17,19,21,24,28,33,39,45,51
  • A7075 39-45T-51T Sprocket
  • Alloy Spiders
  • Alloy Lockring & Spacers
  • Weight - 497g