Ceramic Vs Steel Bottom Bracket

A bb30 bottom bracket that uses ceramic bearings will weigh 3 5 grams less than its stainless steel counterpart.

Ceramic vs steel bottom bracket.

When analyzing the individual components that contribute to the total frictional losses of a bottom bracket the frictional losses due to the seals and lubricant is greater than the frictional losses. They use ceramic balls and usually a steel inner and outer race. Most sealed ceramic bearings are actually hybrid ceramic bearings which combine a steel race with ceramic ball bearings. If there is one thing we see a lot in comments sections about ceramic bearings it is people claiming ceramic bearings do not offer benefits and are not.

Quality hybrid ceramic bearings are better than steel bearings in a bicycle bottom bracket application because they have rounder balls for lower resistance better races for lower resistance and are grease efficient in low rpm low heat environments for lower resistance. Ak posted by ard kessels. Steel bearings are commodity items that are composed of hardened steel balls and a steel inner and outer race. Zerø ceramic bearings and bottom bracket proven time and again in world cup race conditions zerø ceramic bearings are the ultimate race day weapon.

The ceramic balls are often silicon nitride or equivalent. Bottom bracket efficiency is based on the design and the quality of materials not necessarily on the type materials i e ceramic vs. For bottom bracket applications the maximum sustained rpm may be 130 explains lew. Ceramic bearing equipped bottom brackets or hybrid ceramics to be more precise are generally much more expensive than their stainless.

Ceramic is not always better than steel. Which ones do you need. Silicone nitride si3n4 grade 3 balls roll on black oxide races ground to a mirror finish after receiving magnetite and cryogenic treatments for hardness and longevity. Ceramic bearings are in actual fact hybrid.