Bearings

For Bottom Brackets & Rear Hubs. Most bottom brackets use 11 1/4" balls each side. Most rear hubs use 9 1/4" balls each side. Grade 25 is the highest readily available commercial grade, as used in top of the line Campagnolo Record and Shimano Dura-Ace parts.

For most Front Hubs & some Headsets. Grade 25 is the highest readily available commercial grade, as used in top of the line Campagnolo Record and Shimano Dura-Ace parts. Most front hubs use 10 3/16" balls each side.

For Headsets & Pedals. Grade 25 is the highest readily available commercial grade, as used in top of the line Campagnolo Record and Shimano Dura-Ace parts. Fits Brompton headset.

The 7/32" size fits upper level Campagnolo front hubs Grade 25 is the highest readily available commercial grade, as used in top of the line Campagnolo Record and Shimano Dura-Ace parts.