Ceramitech 4030 bearings for ø30mm spindle crank sets ( sold in pairs only)


Size Guide

These ultra-performance 4030 Ceramitech bearings (40x30x7) are exactly what the pro's use for an edge over the competition. These Si3N4 hybrid 4030 bearings fit in all BBInfinite modules designed for use with a 30mm spindle crank set, and are just what's needed for any BB86/BB92/BB30 module or threaded external cup bottom bracket application using a 30mm spindle crank set. These ceramic bike bearings will also work in any application where 4030 bearings are needed.

Each bearing kit ships with: 2x Ceramitech 4030 bearings and 2x BBInfinite logo bearing shields.

Parasitic drag is the enemy within any machine. Frictional losses pile on bit by bit, consuming effort that should be moving you forward. But in any ceramic bearing it's not the balls that wear out, it's the races, which soon fail, causing wattage-sapping drag. That's why our Ceramitech BB30 bottom bracket bearings are processed with additional melting and heat treatment steps. The result is a type of corrosion-resistant steel with a very uniform fine grain material structure that is then micro polished for an ultra smooth race channel. This process produces a spindle bearing that is hard enough to resist ceramic-induced wear, and so smooth that there's no good place for wear to begin. Like you we measure success by comparing distance over time. With these BB30 bottom bracket ceramic bearings, you'll go the distance time, and time again, faster, and faster still.

BB86 Bottom Bracket Bearing Dimensions: 41 x 86.5

4030 Bearing Dimension 30x40x7

BB92 Bottom Bracket Bearing Dimensions: 41 x 91.5

4030 Bearing Dimension 30x40x7

select bearing shield color

Bottom Bracket Selection Guide