- Durable centre shaft built from robust materials for high strength and long service life, suited to demanding mountain biking use. - Sealed cartridge bearings deliver smooth, reliable rotation; square cone design ensures efficient power transmission. - Waterproof and dust-proof construction protects against water, mud and sediment erosion, extending overall lifespan. - Integrated sleeve and bottom bracket help eliminate abnormal noise for a quiet, comfortable riding experience. - Use scenarios: - Replacing worn bottom brackets on cross-country or trail bikes in wet or muddy conditions. - Upgrading enduro or downhill bikes to improve power transfer and reduce noise on long or rough descents. - Routine maintenance or refurbishment of mountain bikes used on mixed terrain for reliable, quiet operation over extended rides.