Cycling
Ceramic Bearings (Oversized): Real Advantage or Pure Marketing?
PUBLISHED: 2026-07-29|READ TIME: 3 MINS|AUTHOR: FRANCESCO CASTALDI
FIGURE: Ceramic Oversized Pulley Wheels
The Era of Marginal Gains
Since Team Sky introduced the concept of *Marginal Gains*, the cycling industry started selling very expensive upgrades to save fractions of a Watt. One of the most popular (and flashy) is the OSPW (Oversized Pulley Wheel System) with ceramic bearings.
The Physics Behind Giant Pulleys
The theoretical idea is solid: a larger pulley forces the chain to bend less. Less bending = less friction between links = Watts saved. Furthermore, spherical ceramic bearings rotate with less resistance than steel ones.
But how many Watts are we saving?
| Component | Estimated Savings (at 250W) | Average Cost | Euro/Watt Ratio |
|---|---|---|---|
| Clean and Lubricated Chain (Wax) | ~3 - 5 Watts | 20€ | 4€ / Watt (Best investment) |
| Oversized Pulleys + Ceramic | ~1 - 2 Watts | 300€ - 500€ | 250€ / Watt (Terrible investment) |
[ WARNING ]
Ceramic bearings require *much* more maintenance than steel ones. If they get dirty and are not cleaned/greased frequently, the friction quickly exceeds that of standard components.
Leave OSPW to sponsored pros. Clean your chain and learn to hot-wax it. It's the cheapest way to buy speed.