KMC GMX9-3 9-Speed Cassette 11-36T Shimano HG Compatible
Wide-range 9-speed cassette with smooth, consistent shifting for everyday riding and drivetrain refreshes.
The KMC GMX9-3 11-36T cassette is a reliable upgrade or replacement for 9-speed drivetrains needing wider gearing and smoother transitions between gears. Designed to pair cleanly with KMC chains and built around a Shimano HG-compatible interface, it delivers predictable shifting and solid durability for commuting, gravel, and light trail use.
Key Functional Details
- 9-speed cassette with wide 11–36T range for climbing and versatility
- Shimano HG freehub compatible (standard on most bikes)
- Optimized tooth progression for smoother gear transitions
- Shift ramps designed for consistent up/down shifting under load
- Works seamlessly with KMC chains and most Shimano/SRAM 9-speed systems
- Durable steel construction for long service life
Technical Specifications
- Speeds: 9-speed
- Gear Range: 11–36T
- Cog Sizes: 11, 13, 15, 18, 21, 24, 28, 32, 36
- Freehub Compatibility: Shimano HG
- Material: Steel cogs
- Color: Black
- Model: GMX9-3
Compatibility & Technical Notes
- Fits Shimano HG freehub bodies (standard road/MTB/freehub design)
- Compatible with Shimano and SRAM 9-speed drivetrains
- Requires a 9-speed chain (KMC, Shimano, SRAM)
- Rear derailleur must support 36T max cog capacity (check before install)
- May require a longer chain when upgrading from smaller-range cassette
- Not compatible with XD or Micro Spline freehubs
Service / Ownership Context
- Common replacement item for worn or skipping drivetrains
- Ideal upgrade for riders needing easier climbing gears
- Best practice: replace cassette with new chain to prevent premature wear
- Install requires cassette lockring tool and chain whip
- Often installed during full drivetrain refresh
Fit & Use Signals
- Good Fit: 9-speed commuters, hybrids, older MTBs, gravel conversions needing wider gearing
- Not A Fit: 10, 11, or 12-speed drivetrains, XD or Micro Spline hubs
- Use Case: Replacement cassette, climbing upgrade, budget drivetrain rebuild
1. Real Mechanic Insights
- Biggest issue: derailleur capacity—many older road derailleurs won’t handle 36T without a hanger extender
- Always check B-screw adjustment when installing a larger cassette
- Pairing a new cassette with an old chain = skipping under load almost guaranteed
- HG freehub compatibility is broad, but customers often confuse it with newer Micro Spline systems
2. Typical Customer Searches
- “9 speed cassette 11-36”
- “wide range cassette for climbing”
- “replace cassette skipping gears”
- “shimano hg cassette 9 speed”
3. Often Replacing
- Worn cassettes causing chain skip
- Smaller range cassettes (11-28, 11-30) when upgrading for hills
- Rusted or neglected drivetrains
4. Good Fit / Not A Fit
- Good Fit: Shimano Altus/Acera/Alivio 9-speed, SRAM 9-speed systems, hybrid and MTB builds
- Not A Fit: 10/11/12-speed systems, SRAM XD driver bodies, Shimano Micro Spline hubs
5. Recommended Shop Pairings
- New 9-speed chain (KMC X9 recommended)
- Rear derailleur adjustment/tune service
- Chain wear measurement and drivetrain inspection
- Hanger alignment service for shifting accuracy
6. What Customers Compare This To
- Shimano HG200 / HG400 9-speed cassettes
- SunRace 9-speed wide range cassettes
- MicroSHIFT Advent 9-speed systems