Rocket Espresso · Flat burrRocket Gravo
Rocket's first home grinder, and it goes straight for grind-by-weight: 63mm blind flat burrs, a built-in scale, and a 2.5-inch touchscreen dressed in Rocket's new design language.
The short version
This is Rocket finally admitting that a matching grinder sells machines, and the on-board scale genuinely removes a step from the counter routine.
Accept that it is a first-generation, freshly launched unit with no long-term reliability record and an ambitious price tag to match the badge.
Why people buy it
- Built-in grind-by-weight scale kills the separate-scale step in the workflow
- 63mm blind flat burrs and a screwless carrier point to genuinely low retention
Why they don’t
- Brand-new first-generation product with no multi-year reliability track record
The full tally
- Built-in grind-by-weight scale kills the separate-scale step in the workflow
- 63mm blind flat burrs and a screwless carrier point to genuinely low retention
- Adjustable RPM (roughly 500 to 1500) gives real-time control over grind speed and heat, not just size
- Design and finish match Rocket's machine lineup for a cohesive counter
- Brand-new first-generation product with no multi-year reliability track record
- Early prototype testing reported dosing spread of roughly plus or minus 0.5 to 0.6g, an area Rocket says it is still refining before full production
- Premium pricing (roughly £1,190 in the UK) for a grinder from a brand with no grinder heritage, and no aftermarket burr ecosystem yet
What the community knows
Years of owner threads, distilled — a niche favourite.
Rare flat-burr grinder with respectable espresso performance (4.5/5 engineering fit) but minimal English-language owner voice, sparse documentation, and steep price relative to proven alternatives like the Niche or Fellow — community judges it as competent but unproven at scale…
Convenience
speed and simplicity, day to day
Reliability
shows up every morning, year after year
Built to last
years before you outgrow or replace it
All 9 community measures
price-to-performance the community respects
shows up every morning, year after year
parts and repairs — you are never stranded
mods, guides, and community know-how around it
kind to first-timers
years before you outgrow or replace it
how far the cup can go, per dollar
speed and simplicity, day to day
Worth knowing before you buy — For that price, community would point you to proven flat-burr alternatives with deeper ecosystem and serviceability assurance first.
Limited community track record on this model — the read above leans on our own spec-honest assessment, and we flag that rather than hide it.
The measurements
Scored 0–5 on the same rubric as everything on file — the words matter more than the numbers.
The measurements
0–5, one rubric- Espresso
- reference4.5
- Versatility
- narrow2.5
- Built to last
- fair3
Position in the market
Every dot is a rival, measured the same way. The gold one is this.
- Upper half for espresso suitability
- a higher ceiling than 112 of the 154 grinders we’ve measured
- Fairly priced for its level
- 59% of grinders this capable cost more
- Lower half for build
- sturdier than 12% of the field, by the community’s own record
Every dot is a grinder measured on the same rubric. See the whole market
Living with it
The part spec sheets skip: counter space, upkeep, and what owners learn later.
The honest note — Owners chasing outright espresso resolution or filter versatility beyond the Gravo's espresso-first single-dose format would look toward dedicated single-dose flagships with proven aftermarket burr scenes; there is no burr-swap path on the Gravo itself today.
The full spec sheet
- Class
- Premium
- Burrs
- 63mm flat
- Drive
- Electric
- Adjustment
- Stepped (micro)
- Clarity lean
- Clarity & sparkle
- Espresso suitability
- 4.5/5
- Brew versatility
- 2.5/5
- Retention
- ~1 g
- Single dosing
- Yes
- Hopper
- 300 g
- Workflow demand
- 1.5/5
- Maintenance
- 2.5/5
- Noise
- 2/5
- Build longevity
- 3/5
Before it arrives
What completes this grinder — the faded pieces can wait.
Coffee scale with timer — Espresso is a ratio. A 0.1g scale with a built-in timer is the single biggest consistency upgrade for any manual machine.
- Coffee scale with timer — Espresso is a ratio. A 0.1g scale with a built-in timer is the single biggest consistency upgrade for any manual machine.
- Dosing cup — Pairs with single-dose grinding — grind into the cup, swirl, and transfer to the portafilter cleanly.
- Grinder cleaning kit — Brushes and grinder tablets keep retention and stale grounds in check.
Feed it right
Week one is dial-in — and stale beans will lose it.
Coffee more than a few weeks past roast won’t extract predictably, and a new grinder gets blamed for it. These burrs lean bright — washed single-origins with real acidity are where they earn their price.
Pick your coffee — any of these dials in beautifully here:
Sergio - Brazillian Fazenda Joia Rara Aerobic FermentedSCA 88Medium-light · Cerrado Mineiro · Aerobic FermentedHoney · OrangeEnough brightness to show what this gear can separate.CA$29.18 · roasted to order
Honeycrest - Costa Rican Volcán AzulSCA 87Medium-light · West Valley · Red HoneyRaisins · Maple SyrupEnough brightness to show what this gear can separate.CA$19.50 · roasted to order
Wild Ember - Ethiopian Buno Dambi UddoSCA 92Medium roast · Odo Shakiso, Guji Zone, Oromia · NaturalBlueberry · MarmaladeEnough brightness to show what this gear can separate.CA$26.83 · roasted to orderWhole bean, dated, ready for your burrs the week it lands.
Roasted to order, daily, in Ajax, Ontario · ships Canada-wide. We’re the roastery behind this database — measuring the machines is how we make sure the coffee gets a fair shot.
Common questions
Does the Rocket Gravo have grind-by-weight technology?
Yes. It has an integrated real-time scale that weighs each dose during grinding and stops automatically once the target weight is hit, alongside grind-by-time and single-shot modes.
What size are the Gravo's burrs?
It uses 63mm flat burrs in a screwless, blind-burr design intended to reduce retention.
Can you swap in aftermarket burrs for the Gravo?
There is no documented aftermarket burr ecosystem for the Gravo's 63mm size at this point; it ships with Rocket's own blind burr set.
Worth comparing
Kafatek
Monolith Flat (Titan SDRM)
A Seattle-machined single-dose flat burr grinder built around 75-80mm in-house Shuriken burrs. This is the boutique end-game grinder people save up for and then stop shopping.
US$2,650
Eureka
Atom Excellence 75
A commercial-grade 75mm flat-burr grinder that trades peak brute speed for a quieter, sturdier housing and a touchscreen — it grinds a double shot in seconds and disappears into the background noise-wise.
CA$1,600–2,200 · US$1,200–1,700
Option-O
Lagom P64
A 64mm single-dose flat burr grinder from Melbourne's Option-O, built around a CNC-machined unibody, swappable SSP/Mizen burr sets, and a variable-RPM motor. Long considered a benchmark for premium single-dosing, though we hear the price tag every time we recommend it.
CA$2,000–2,200 · US$1,585–1,650
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