Because ceramic bearings are rounder with a smoother surface and more uniform size friction is reduced and that can contribute to a less energy required.
Do ceramic bearings make a difference.
Rolling resistance is the key trump card promoted by ceramic bearing fans.
If a cyclist has ridden a bike fitted with ceramic bearings and then returns to steel bearings it is likely that slightly more vibration will become noticeable.
Fitting ceramic bearings will make the bike feel like it is rolling smoother.
For example while full ceramic bearings do not require lubrication hybrid bearings do.
On ceramic bearings this is usually a c3 clearance whilst on steel it s usually cn.
Despite the small difference in design hybrid bearings requirements differ quite extensively from full ceramic bearings.
While regular bearings are made from stainless steel ceramic bearings are made from ceramic silicon nitride si2n4.
This is mostly due to the additional time spent to perfect a quality ceramic ball.
Cost of purchase for ceramic and steel bearings.
If only high quality ceramic bearings are used marginal gains will.
However while the ceramic balls will still abrade the steel rings hybrids will cope with marginal lubrication better than steel.
The first thing that strikes the eye when looking at bicycle bearings is the difference in price between steel bearings and hybrid ceramic bearings.
The only real big noticeable difference between the two is the bearing clearance.
Replacing them with low quality ceramic bearings doesn t make sense as they will very soon be worse than the original ones.