Confused about HG, MS, MSR, XD, and XDR freehub bodies?
Pick the wrong one, and your new cassette won’t mount, your shifting will skip, and you could even damage your wheel hub.
We break it down simple & clear for every rider 🚴
⚙️ HG (Hyperglide) | The Reliable Workhorse
Best for: Budget builds, daily rides, 8–11 speed groupsets
Compatibility: All classic Shimano road & mountain bike cassettes
Key points:
- ✅ Universal, cheap, easy to replace
- ✅ Super durable for daily commuting & trail use
- ❌ Only up to 11-speed, min 11T cog, no 12-speed support
Rider vibe: No fuss, long-lasting, perfect standard option.
⚙️ MS (Micro Spline) | Shimano 12-Speed MTB Only
Best for: Modern 12-speed mountain bikes & gravel off-road
Compatibility: Shimano 12-speed MTB cassettes only (XT / XTR)
Key points:
- ✅ 23 fine splines = stronger grip, no slipping under hard torque
- ✅ 10T small cog = wider gear range, easier steep climbing
- ❌ Not backward compatible with old 11-speed parts
Rider vibe: Aggressive trail, enduro, all-mountain riders only.
⚙️ MSR (Micro Spline Road) | Shimano 12-Speed Road/Gravel
Best for: Road bikes, race bikes, fast gravel 12-speed setups
Compatibility: Shimano 12-speed road cassettes (Ultegra / Dura‑Ace)
Key points:
- ✅ Same strong 23-spline design as MS
- ✅ Optimized road-length body for precise, fast shifting
- ❌ Road-only, cannot swap with MTB wheels directly
Rider vibe: Road cyclists chasing clean, responsive 12-speed performance.
⚙️ XD (X-Dome) | SRAM 12-Speed MTB Standard
Best for: SRAM Eagle 12-speed mountain bike builds
Compatibility: All SRAM 11/12-speed MTB Eagle cassettes
Key points:
- ✅ No circlip design = lighter, cleaner, stronger structure
- ✅ 10T low gear for massive climbing range
- ❌ Strictly mountain bike use, not for road hubs
Rider vibe: SRAM loyal MTB riders, full-suspension & hardtail builds.
⚙️ XDR (XD Road) | SRAM 12-Speed Road & Gravel
Best for: SRAM Force / Red road & gravel 12-speed groupsets
Compatibility: SRAM road cassettes; XD cassettes work with a spacer
Key points:
- ✅ +1.85mm longer than XD, perfect road hub fit
- ✅ Lightweight, fast-engagement for sprint & gravel rides
- ❌ XDR cassettes do NOT fit regular XD freehubs
Rider vibe: Gravel grinders & road racers running SRAM 12-speed.
♦Quick 3-Second Buying Rule
- Old 8–11 speed Shimano → HG
- Shimano 12-speed MTB → MS
- Shimano 12-speed Road → MSR
- SRAM 12-speed MTB → XD
- SRAM 12-speed Road/Gravel → XDR
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