# Rocket Espresso R Nine One

> Espresso compatibility data from EspressoFit. Confidence: **measured (documented inference or third-party measured spec)**.
> Sources last read firsthand: 2026-07-15.
> Canonical page: https://espressofit.com/machines/rocket-r-nine-one/

## Specifications

- **Portafilter diameter:** 58 mm
- **Basket type:** non-pressurized
- **Grouphead standard:** 58mm (saturated group)
- **Brand:** Rocket Espresso

## Compatible baskets and parts

- IMS B70 Competition 1 Cup (B701TH26.5E) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-1-cup/
- IMS B70 Competition 1 Cup H18.5 (B701TH18.5N) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-1-cup-h18-5/
- IMS B70 Competition 1 Cup H19.5 (B701TH19.5N) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-1-cup-h19-5/
- IMS B70 Competition 1 Cup H24.5 (B701TH24.5N) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-1-cup-h24-5/
- IMS B70 Competition Convex 2 Cup (B702TCH26E) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-2-cup/
- IMS B70 Competition 2 Cup H22.5 M Pattern (B702TH22.5M) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-2-cup-h22-5-m/
- IMS B70 Competition 2 Cup H24.5 (B702TH24.5M) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-2-cup-h24-5/
- IMS B70 Competition 2 Cup H26.5 (B702TH26.5M) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-2-cup-h26-5/
- IMS B70 Competition 2 Cup H28.5 M Pattern (B702TH28.5M) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-2-cup-h28-5-m/
- IMS B70 Competition Convex 2 Cup H20 (B702TCH20E) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-convex-2-cup-h20/
- IMS B70 Competition Convex 2 Cup H22 (B702TCH22E) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-convex-2-cup-h22/
- IMS B70 Competition Convex 2 Cup H24 (B702TCH24E) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-convex-2-cup-h24/
- IMS B70 Competition Convex 2 Cup H28.5 (B702TCH28.5E) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-convex-2-cup-h28-5/
- IMS B70 Competition NanoQuartz 2 Cup H20 (B702TFH20NT) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-nanoquartz-2-cup-h20/
- IMS B70 Competition NanoQuartz 2 Cup H22 (B702TFH22NT) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-nanoquartz-2-cup-h22/
- IMS B70 Competition NanoQuartz 2 Cup H24 (B702TFH24NT) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-nanoquartz-2-cup-h24/
- IMS B70 Competition NanoQuartz 2 Cup H26 (B702TFH26NT) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-nanoquartz-2-cup-h26/
- IMS B70 Competition NanoQuartz 2 Cup H28 (B702TFH28NT) (58mm basket) — https://espressofit.com/baskets/ims-b70-competition-nanoquartz-2-cup-h28/
- IMS DS58.5 Puck Diffuser Screen (puck-screen) — https://espressofit.com/parts/ims-ds58-5-puck-screen/

## Notes

The R Nine One is Rocket Espresso's top-of-range machine — commercial-grade
engineering (fully saturated group, dual boilers, PID, full pressure profiling)
in a domestic format. Unlike the rest of Rocket's line it uses a **saturated
group rather than an E61**, but it is still the 58mm commercial standard: this
entry is **measured tier** because Rocket prints no diameter, and the 58mm
figure comes from IMS's competition catalogue, whose 58/58.4mm B70 list names
ROCKET (and covers saturated-group makers like La Marzocco and Slayer alongside
E61). As a 58mm machine it takes any standard 58mm basket — the VST and IMS B70
baskets here fit. A firsthand Rocket statement of "58mm" would lift it to
manufacturer-verified.

## Sources

- https://rocket-espresso.com/pdf/ROCKET_Domestic_Catalog.pdf
  - Official Rocket Espresso domestic catalogue, read firsthand 2026-07-15. The R Nine One page states verbatim it is 'Equipped with a fully saturated group, dual stainless-steel boilers, PID temperature control and a full pressure-profiling system'. The catalogue prints no portafilter diameter, and this is a saturated group (not E61), so the 58mm figure rests on the measured source below.
- https://www.imsfiltri.com/IMS-competition-Catalogue.pdf
  - Official IMS Filtri competition catalogue, read firsthand 2026-07-13. Its B70 (tamper 58 / 58.4 mm) list — headed 'E61 & compatible groups' and explicitly including saturated-group makers such as LA MARZOCCO, SLAYER and SYNESSO — names ROCKET among the 58mm brands. A basket maker's measured fitment, the basis for the diameter here.

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Compatibility reference, not a substitute for your machine's manual. Every claim above cites the source it came from; see https://espressofit.com/methodology/ for how entries are verified. Corrections: corrections@espressofit.com.