Bottom Bracket

Beschrijving

**Bottom Bracket: Comprehensive Product Description**

**Functionality**
The Bottom Bracket is a critical bicycle component that connects the crankset to the frame, enabling smooth rotation of the pedals. It houses bearings and a spindle, ensuring efficient power transfer from the rider’s legs to the drivetrain. Designed for compatibility with 68mm shell-width frames, it accommodates various crankset configurations, making it suitable for road, mountain, hybrid, and touring bikes.

**Key Features**
– **Material:** Constructed from high-grade **STEEL** for exceptional durability, corrosion resistance, and long-term reliability under heavy loads or harsh conditions.
– **Spindle Length Options:** Multiple spindle lengths (110.5mm, 113mm, 116mm, 118mm, 120mm, 122.5mm, 124.5mm, 127mm) ensure precise compatibility with diverse cranksets and chainline requirements.
– **Shell Width:** Universally fits 68mm bottom bracket shells, a standard for many road, hybrid, and older mountain bike frames.
– **Sealed Bearings:** Low-maintenance design with sealed cartridge bearings for smooth operation and protection against dirt, water, and debris.
– **Interchangeability:** Compatible with single, double, and triple cranksets, as well as square-taper, JIS, or ISO spindle interfaces.

**Size-Specific Compatibility**
– **68×110.5mm:** Ideal for road bikes with compact cranksets or specific triple-chainring setups.
– **68x113mm:** Common for road and touring bikes requiring moderate chainline clearance.
– **68x116mm–68x127mm:** Suited for mountain bikes, fat bikes, or custom builds needing wider spindle lengths for optimal chain alignment and tire/frame clearance.

**Use Cases**
– **Road Bikes:** Shorter spindle lengths (110.5–118mm) ensure efficient power transfer and narrow Q-factor.
– **Mountain Bikes:** Longer spindles (120–127mm) accommodate wider rear hubs and tire clearance.
– **Hybrid/Commuter Bikes:** Mid-range lengths (113–120mm) balance stability and versatility.
– **Vintage/Restoration Projects:** Compatible with classic frames requiring steel construction and square-taper spindles.

**Installation & Maintenance**
– Ensure frame shell is clean and faced to 68mm width.
– Use appropriate tools (e.g., bottom bracket wrench) for installation.
– Grease threads to prevent seizing.
– Periodically check bearing smoothness; replace if grinding or play is detected.

**Product Categories**
– **Primary:** Bottom Bracket
– **Secondary:** Bicycle Parts

**Short Description**
High-strength STEEL Bottom Bracket for 68mm frames, available in spindle lengths 110.5–127mm. Ensures durable, smooth crankset rotation for road, mountain, and hybrid bikes. Sealed bearings for low maintenance.