Which to buy · Every setting
Option-O Lagom P64 vs Rancilio Rocky
Two grinders cross-shopped at the same money. The Lagom P64 is numbered 0–10; the Rocky is numbered 0–55.
Which to buy
Choose the
Lagom P64 if you…
- want variable speed, 300–1,400 rpm under load
- single-dose — Option-O quotes under 0.1 g retention with RDT
- want stepless adjustment — each 0.1 line moves the burr 10 microns
Choose the
Rocky if you…
- grind from a 0.3 kg hopper
- want stepped settings you can return to — up to 50 on the front ring
- pair it with a Rancilio Silvia — Rancilio pitched it as its partner
Shop links are affiliate links: BrewMark earns a commission if you buy through one, at no extra cost to you. The verdicts were written without regard to it.
Neither is sold new. Rancilio no longer lists the Rocky (its page now returns 404) and sells the Stile as its home grinder. The P64 no longer appears in Option-O's shop; Option-O now sells the LAGOM P80, which it says keeps the P64's form with everything inside re-engineered. The settings on this page are for the P64.
Sources: Option-O — LAGOM P64 · Option-O — Shop · Option-O — LAGOM P80 · Rancilio Group — Rocky (archived Jan 2022) · Rancilio Group — Rocky SD specifications (archived May 2022) · Rancilio Group — Stile
| Lagom P64 | Rocky | |
|---|---|---|
| Brand | Option-O | Rancilio |
| Scale | Numbered dial | Numbered dial |
| Dial range | 0 – 10 | 0 – 55 |
| Burrs | Flat | Flat |
| Espresso → filter | 5.2 numbers | 20 numbers |
| Filter → coarse | 2.6 numbers | 23 numbers |
The same number means different things
Both grinders use a numbered dial, which makes it tempting to copy a number straight across. Setting 5 sits at grind index 35 on the Lagom P64 but 0 on the Rocky — far enough apart to change the cup.
Converting a setting
If a recipe quotes a setting for one of these grinders, read across for the equivalent on the other. Rows are spaced evenly by grind size, not by dial number — on a conical burr those are not the same thing.
| Lagom P64 | Rocky |
|---|---|
| 0.5 | 5 |
| 1.4 | 9 |
| 2.4 | 14 |
| 3.6 | 18 |
| 4.8 | 22 |
| 5.7 | 26 |
| 5.9 | 29 |
| 6.1 | 32 |
| 6.2 | 36 |
| 6.6 | 39 |
| 7.2 | 42 |
| 7.7 | 45 |
| 8.3 | 48 |
| Rocky | Lagom P64 |
|---|---|
| 5 | 0.5 |
| 9 | 1.4 |
| 14 | 2.4 |
| 18 | 3.6 |
| 22 | 4.8 |
| 26 | 5.7 |
| 29 | 5.9 |
| 32 | 6.1 |
| 36 | 6.2 |
| 39 | 6.6 |
| 42 | 7.2 |
| 45 | 7.7 |
| 48 | 8.3 |
Side by side, by brew method
Where each grinder lands for the same brew, worked out from its own dial curve.
| Method | Lagom P64 | Rocky |
|---|---|---|
| Espresso | 1.1 | 8 |
| Moka pot | 2.2 | 13 |
| AeroPress (short steep) | 3.6 | 18 |
| Pour over — V60 / cone | 5.4 | 24 |
| Siphon | 5.7 | 26 |
| Pour over — flat bottom | 5.8 | 27 |
| Steep and release — Clever / Switch | 5.9 | 28 |
| Drip / batch brew | 5.9 | 29 |
| Cupping | 5.9 | 30 |
| Chemex | 6.1 | 32 |
| French press | 6.4 | 38 |
| Cold brew | 7.5 | 44 |
The shape of each dial
Where the connectors bunch, that grinder’s dial is compressed and single steps count for more. Comparing the two shapes tells you which gives finer control, and where.
Option-O Lagom P64
Rancilio Rocky
Dialing in the Lagom P64
A single-dose flat-burr grinder built around burr swapping — the character changes substantially with the set you fit, so treat published numbers as approximate across different burrs. Stepless, so the settings below are targets.
Dialing in the Rocky
A stepped espresso grinder that has been the budget recommendation for a very long time. The 55 steps across 50mm flat burrs are its limitation — for espresso you will sometimes want a setting between two of them and there is not one, and a single step can move a shot by seconds. Twenty of those steps cover espresso through filter, which is more resolution than the fine end usually gets at this price. Two things make it an espresso grinder in practice rather than a general one: changing setting means holding the locking lever while twisting the hopper, and it keeps a couple of grams in the chute, so every switch between espresso and pour over costs you both fiddling and coffee. Most owners pick one end and stay there.