What Are the Alternatives to Shimano BB86 SM-BB72-41B and SM-BB92-41B Bottom Brackets?
In 2025, the BB86 standard is among the most widely used: 86 mm shell width and 41 mm inner diameter (press-fit bearings). It enables light, stiff frames with bearings positioned close to the crank arms for optimal power transfer.
Shimano’s BB72-41B (105/Ultegra) and SM-BB92-41B (Dura-Ace) are light and quiet thanks to their plastic construction, but can induce up to ~2 W of efficiency loss. At an average 150 W output, that’s still measurable.
Looking to improve drivetrain efficiency? Here are three upgrades that outperform the stock units.
Bikone BB86 Shimano Steel
A reliable, technical upgrade to boost bearing quality.
- High-quality steel bearings for durability.
- Aluminum cups tailored to BB86 frames.
- Optimized seals for better protection.
BB86 Shimano CyclingCeramic
The safest bet for maximum efficiency and smoothness.
- Hybrid tunnel (plastic/aluminum) for perfect alignment.
- Ceramic bearings with ultra-low friction.
- Competitive pricing vs. other ceramic options.
Bikone BB86 Shimano Ceramic
A high-end blend of bearing quality, sealing and robustness.
- Protective tunnel for alignment and longevity.
- Premium ceramic bearings for maximum efficiency.
- Engineered for demanding BB86 frames.
Why replace your stock Shimano bottom bracket?
BB72-41B and BB92-41B are interchangeable; moving from 72 to 92 yields only minor gains. The options above deliver tangible benefits: higher efficiency (reduced friction) and greater durability (better materials and seals). Also see our 2025 professional bike chart to check which brands run BB86.
Conclusion: choose the best BB86 upgrade for your frame
Swapping a Shimano BB86 unit is a high-impact optimization for smoothness and longevity. Pick Bikone Steel for a cost-effective upgrade, CyclingCeramic for maximum fluidity, or Bikone Ceramic for a robust, high-performance solution.
FAQ — BB86 Shimano: weight, efficiency and bottom bracket choice
What is the weight of the Shimano SM-BB71-41B?
≈ 69 g.
What is the weight of the Shimano SM-BB92-41B?
≈ 65 g.
What is the weight of the Bikone BB86 Shimano Steel?
≈ 102 g.
What is the weight of the CyclingCeramic BB86 Shimano?
≈ 89 g.
What is the weight of the Bikone BB86 Shimano Ceramic?
≈ 98 g.
All else equal, are ceramic-bearing models lighter than steel?
Yes. Ceramic balls are lighter, but their volume is small versus the complete BB assembly: the average saving is about 4 g in favor of ceramic.
Why are Shimano BB86 bottom brackets steel?
Shimano supplies bottom brackets with steel bearings and abundant grease to ensure quiet operation and reliability over the first thousands of kilometers. It’s robust and low-maintenance, but not optimized for “maximum efficiency.”
Weight vs. ceramic: which matters more when choosing a BB?
Weight has a very small effect on required power: saving 10 g typically equates to about ≈ 0.004 W on flat (~36 km/h) and ≈ 0.02–0.03 W on a 6–8% climb. In contrast, replacing a stock Shimano BB86 with a ceramic model can yield up to ≈ 2 W in efficiency gains. In short, bearing efficiency matters far more than a few grams.
What’s the “secret” of a great ceramic BB86 for Shimano?
High-quality aluminum cups, precise press-fit ensuring perfect alignment, then a low-friction grease once those prerequisites are met. Result: the crankset can spin up to ~20 freewheel turns, versus typically 3–4 with a stock Shimano BB.
Are there steel BBs better than Shimano?
Yes — Bikone Steel stands out with low-friction seals that deliver surprisingly high efficiency for a steel-bearing BB.