Mountain bikes take a beating, and your bottom bracket bears the brunt. Our BB92 MTB bottom bracket uses Grade 3 silicon nitride ceramic bearings with DLC-coated races — harder, smoother, and dramatically longer-lasting than the steel bearings that came with your frame. Heavy-duty seals protect against mud, water, and trail debris. Glass-reinforced nylon cups absorb shock without creaking. Built for Shimano's 24mm MTB spindle.
What You Get
- ✓ Built for trail abuse — heavy-duty seals included
- ✓ Grade 3 Si₃N₄ ceramic balls with DLC-coated races
- ✓ Glass-reinforced nylon cups absorb trail vibration
- ✓ Purpose-built for Shimano 24mm MTB spindle
- ✓ 92mm shell width for mountain bike frames
- ✓ Outlasts steel bearings 3–5x even in harsh conditions
Technical Specifications
| Weight |
64g |
| Seal Type |
Heavy-duty contact seals + dust covers |
| Tolerance |
ABEC-7 |
| Cup Material |
Glass-reinforced nylon |
| Expected Life |
15,000–20,000 miles |
| Race Material |
52100 Chromium Steel, DLC Coated |
| Shell Standard |
BB92 (41mm ID, 92mm) |
| Bearing Material |
Grade 3 Silicon Nitride (Si₃N₄) |
| Spindle |
24mm (Shimano MTB) |
Compatibility
Shimano XTR (M9100, M9120)
Shimano XT (M8100, M8120)
Shimano SLX (M7100)
Shimano Deore (M6100)
Most modern MTB frames with BB92 shell