By seamlessly threading into your English thread (BSA) bottom bracket, it lets you run 30mm spindle cranks.

• Compatible only with English threaded (BSA) bottom brackets.
• Compatible only with 30mm spindle cranks.
• Bearing races are fully coated for long term corrosion resistance.
• Bearings are factory filled with Phil Wood grease.
• Inner sleeve protects spindle and bearings from internal moisture buildup.
• Accommodates  73mm, 83mm, 100mm shell widths.
• Requires the Race Face Cinch BSA BB Cup Tool for installation.