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New product -45%Square taper bottom bracket Shimano Altus 116 mm- €6.04
- €10.99
New product -30%Bottom bracket Shimano SM-BBR60 ultegra 105- €20.29
- €28.99
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New product -26%Road bike campagnolo ultra torque OS-FIT cups- €19.98
- €27.00
New product -44%
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Used
New product -40%Campagnolo Record ultra torque BSC road bike cups- €16.20
- €27.00
New product -30%Road bike bottom bracket shimano press fit SM-BB71-41B- €22.33
- €31.90
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New product -44%Sram GXP BB104.5 press fit road bike bottom bracket- €29.67
- €52.99
More detailsNew product Out-of-Stock
More detailsNew product -52% Out-of-StockCrankset bearings Campagnolo Power torque- €16.75
- €34.90
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More detailsNew product -40% Out-of-StockBottom bracket axle TA Axix Light 110 mm- €77.99
- €129.99
Showing 1-21 of 21 item(s)
The fixie bottom bracket is a central part of any bike, including fixies. It plays an essential role in power transmission, connecting the cranks of the fixie crankset to the frame and allowing smooth and efficient pedaling. Fixies, known for their minimalism and straightforward performance, require a bottom bracket tailored to their unique demands.
1. Function of the fixie bottom bracket:
- Connect the cranks to the frame via a central axle.
- Allow smooth rotation of the pedals thanks to integrated bearings.
- Ensure optimal rigidity for direct power transmission.
2. Types of bottom brackets:
Depending on thread and installation:
BSC (British Standard Cycle) or ISO
Features :
- Most common standard thread on fixies.
- Compatible with the majority of modern and old frames.
- Ease of installation and replacement.
- Width: 68 mm (road and fixie standard).
- Axle often in 103 to 110 mm depending on the chain and crankset.
ITA (Italian):
Features :
- Less common thread, especially on high-end Italian frames.
- Threaded on both sides in the same direction.
Width: 70mm.
Press-Fit:
Features :
- No thread, housing inserted directly into the frame.
- Lighter, but requires a compatible frame.
- Specificity: Rarely used on fixies, more on modern bikes.
3. Materials
Steel :
- Tough and durable, ideal for vintage or heavy-duty fixies.
- Slightly heavier weight.
Aluminum:
- Lightweight, common on modern models.
- Good resistance to corrosion.
Carbon:
- Used for high-end or competition fixies.
- Extremely light and efficient.
Bearings:
- Sealed bearings: Waterproof and durable, requiring little maintenance.
- Ball bearings (open bearings): Less expensive but requiring regular maintenance.
4. Compatibility of a fixie bottom bracket:
Crank type:
Check that the axle of the housing corresponds to your crankset (square, octalink, or integrated axle).Axle length:
Influences the chain line. For a fixie, it is crucial that the chain line is perfectly straight.Frame standard:
Make sure the threads or housing dimensions match the frame.5. Current Technologies:
Square Taper:
Features :
- Traditional, simple and reliable system.
- Compatible with many fixie cranksets.
- Affordable and easy to find.
- Good rigidity for urban use.
Octalink or ISIS:
Features :
- Splined axle offering better rigidity.
- Less common on fixies, but compatible with some modern cranksets.
Optimized power transmission.
Integrated Axis:
Features :
- Axle directly integrated into the crankset (e.g. Shimano Hollowtech, SRAM GXP).
- Reduction in total weight.
Increased stability and reduced maintenance.6. Key dimensions of a fixie bottom bracket :
Hull width :
- Most fixies use frames with a width of 68 mm (road standard).
- Some exotic frames may have a different width (70 mm for Italian frames).
Axle length :
- Depends on crankset and required chainline.
- Typically between 103mm and 110mm for fixies.
7. Popular brands and models of fixie bottom bracket:
Shimano
Reliable models like the UN55 or UN300 (square axle).
Compatible with most standard fixie frames.Sugino
Known for its durable, fixie-friendly cranksets and bottom brackets.
Perfect for high-end configurations.Phil Wood
Premium construction with ultra-durable sealed bearings.
Ideal for intensive use or collector's fixies.FSA (Full Speed Ahead)
Lightweight, high-performance cases, often made of aluminum.
Offers models for square and integrated axles.Token
Stylish bottom brackets, with lightweight and colorful options.
Suitable for lovers of customization.8. Maintenance
Regular cleaning:
Remove dust and dirt that may accumulate around the bearings.Lubrication:
Ball bearings requiring periodic lubrication.Checking the voltage:
Make sure the housing is properly tightened to avoid squeaks or looseness.9. Advantages and uses of a fixie bottom bracket :
Mechanical simplicity:
Fewer components than a multi-speed bike, reducing wear and mechanical problems.Direct transmission:
Power optimization for efficient pedaling, essential for fixies.Versatility:
Compatible with various configurations depending on the type of crankset.Conclusion
The fixie bottom bracket is a key element that combines robustness and simplicity. Standards like the square axle or sealed bearings offer optimal reliability for urban journeys or sports performances. By choosing recognized brands like Shimano, Sugino or Phil Wood, you guarantee durability and efficiency adapted to the specific requirements of a fixie bike.