Hollowtech II uses 24 mm axles and bearings. After studying all factors and testing, Shimano made the decision to adopt the 24 mm diameter axle and bearings to provide the best balance of rotating performance / stiffness / strength / sealing / weight in Shimano Quality.

Feature

• Bottom bracket cup and shield sets for Saint M825/815 or M820/810
• Extra long threads on drive-side cup for increased interface when using BB mounted chain control device
• Gold annodized finish
• Includes: (1ea) left and right bearing cups, center shield with o-rings, and (3) 2.5mm spacers