Direct drive vs belt drive

The burr carrier is either attached directly to the motor shaft (direct drive) or connected via a belt (belt drive).

Category: Grinders — Burrs & Build

Two ways to transfer motor power to the burrs. Direct drive attaches the burr carrier directly to the motor shaft. Belt drive connects them through a toothed or smooth belt and pulleys.

Why it matters — Direct drive is simpler, lower-maintenance, and quieter. Belt drive (used in some EK43-style grinders and the original Mythos) allows the burrs to spin slower than the motor's native speed — useful for big burrs that need low RPM to avoid heat.

Good to know

Direct drive dominates home and most café espresso grinders.
Belt drive is more common in filter / batch grinders where larger burrs and lower speeds are desirable.