Ceramic Bottom Bracket Vs Steel

The average frictional losses of the ceramic bottom brackets is 0 60 watts while the average frictional losses of the steel bottom brackets is 1 02 watts.

Ceramic bottom bracket vs steel.

Geometrically the contact points inner and outer dimensions and thickness between steel and ceramic bearings is the same so they are interchangeable. He was so frustrated with bottom brackets failing due to the heavy mud in belgian cyclocross races that he started buying whatever was the cheapest available. In the article zinn compiles a chart of test data that compares the rotational resistance of among others an fsa mega exo steel ball bearing bottom bracket as compared to the same bottom bracket equipped with ceramic bearings. A bb30 bottom bracket that uses ceramic bearings will weigh 3 5 grams less than its stainless steel counterpart.

The results were new bearings for every single race a lot of work for stef and helen racing world cups on bearings similar to the. The majority of the professional peloton advocates the. Cost of purchase for ceramic and steel bearings. 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.

While regular bearings are made from stainless steel ceramic bearings are made from ceramic silicon nitride si2n4. The highest performing ceramic threaded bottom bracket outperformed the highest performing steel threaded bottom bracket made by hawk racing by less than 1. On ceramic bearings this is usually a c3 clearance whilst on steel it s usually cn. There has been a lot of coverage and many tests over the past few years on the benefits of ceramic bearings over standard steel bearings.

The only real big noticeable difference between the two is the bearing clearance. While the first two items were more prevalent distinguishers between ceramic and steel bearings in the past today there are often comparably built steel versions of a given bearing assembly. Rolling resistance is the key trump card promoted by ceramic bearing fans. This difference between the ceramic and steel with no further explanation can lead to a quick but inaccurate conclusion that ceramic bearings generally exhibit less friction than steel bearings.

However the ceramic bearing costs just short of twice as much as the hawk racing bearing. Ceramic bearing equipped bottom brackets or hybrid ceramics to be more precise are generally much more expensive than their stainless steel cartridge equipped brethren.