Cassette
SunRace CSMZ903 (11-51T)
12-speed 11-51T, HG spline (no XD needed), Shimano/SRAM compatible
What this fits
- Freehub body
- Shimano HG
- must match your bike
- Speeds
- 12
- must match your bike
- Range
- 11-51
- must be within your bike's limit
Cogs: 11-13-15-17-19-21-24-28-33-39-45-51
Mixing speed counts across shifter, derailleur, chain and cassette is the most common upgrade mistake — check every part in the drivetrain, not just this one.
Intended for mtb builds.
Manufacturer specifications
- Cassette Body Type
- Shimano HG
- Cogs
- 11-13-15-17-19-21-24-28-33-39-45-51
- Color
- Black Chrome
- Defined Color
- Black
- Drivetrain Speeds
- 12
- Range
- 11-51
- Weight
- 497
Specifications recorded from the retailer product listing.
Where to buy
We don't have a retailer link for this part yet. Any bike shop can order it — take the exact name from this page so you get the right version.