# IMS B70 Competition 2 Cup H28.5 M Pattern (B702TH28.5M)

> Espresso compatibility data from EspressoFit. Confidence: **manufacturer (Tier 1 — manufacturer primary source read firsthand)**.
> Sources last read firsthand: 2026-08-21.
> Canonical page: https://espressofit.com/baskets/ims-b70-competition-2-cup-h28-5-m/

## Specifications

- **Diameter:** 58 mm
- **Depth:** 28.5 mm
- **Type:** non-pressurized (single-wall)
- **Brand:** IMS

## Fits these machines

- Breville Oracle (58mm portafilter) — https://espressofit.com/machines/breville-oracle/
- ECM Estetika (58mm portafilter) — https://espressofit.com/machines/ecm-estetika/
- ECM Mechanika MAX II (58mm portafilter) — https://espressofit.com/machines/ecm-mechanika-max-ii/
- Flair 58 (58mm portafilter) — https://espressofit.com/machines/flair-58/
- La Marzocco GS3 (58mm portafilter) — https://espressofit.com/machines/la-marzocco-gs3/
- La Marzocco Linea Micra (58mm portafilter) — https://espressofit.com/machines/la-marzocco-linea-micra/
- La Marzocco Linea Mini (58mm portafilter) — https://espressofit.com/machines/la-marzocco-linea-mini/
- Lelit Bianca (PL162T) (58mm portafilter) — https://espressofit.com/machines/lelit-bianca/
- Lelit Elizabeth (PL92T) (58mm portafilter) — https://espressofit.com/machines/lelit-elizabeth/
- Lelit Kate (PL82T) (58mm portafilter) — https://espressofit.com/machines/lelit-kate/
- Lelit MaraX (PL62X) (58mm portafilter) — https://espressofit.com/machines/lelit-marax/
- Lelit Victoria (PL91T) (58mm portafilter) — https://espressofit.com/machines/lelit-victoria/
- Rancilio Silvia (58mm portafilter) — https://espressofit.com/machines/rancilio-silvia/
- Rancilio Silvia Pro (58mm portafilter) — https://espressofit.com/machines/rancilio-silvia-pro/
- Rancilio Silvia Pro X (58mm portafilter) — https://espressofit.com/machines/rancilio-silvia-pro-x/
- Rocket Espresso Appartamento (58mm portafilter) — https://espressofit.com/machines/rocket-appartamento/
- Rocket Espresso Epica (58mm portafilter) — https://espressofit.com/machines/rocket-epica/
- Rocket Espresso Giotto Fast (58mm portafilter) — https://espressofit.com/machines/rocket-giotto/
- Rocket Espresso Mozzafiato Fast (58mm portafilter) — https://espressofit.com/machines/rocket-mozzafiato/
- Rocket Espresso Porta Via (58mm portafilter) — https://espressofit.com/machines/rocket-porta-via/
- Rocket Espresso R Nine One (58mm portafilter) — https://espressofit.com/machines/rocket-r-nine-one/

## Notes

The **deepest** basket in IMS's ridged M-pattern B70 line — 28.5mm, rated 20–22 g for a dark roast and up to **26 g for a light one**, which is about as much coffee as a 58mm double will take.

## Ridged, and why that matters here

Unlike IMS's convex and NanoQuartz B70 lines, the M-pattern baskets are
**ridged** — IMS gives the ridge as an external Ø60.5mm. That lip is what the
portafilter's retaining spring grips, so this is the line to choose if you use a
**spouted** portafilter and want the basket held positively in place. On a
bottomless holder the ridge does nothing useful, and the ridgeless
[convex line](/baskets/ims-b70-competition-convex-2-cup-h24/) is the better
match.

## The M pattern

641 holes of 0.30mm, circular with a conical cross-section, arranged in IMS's
**M pattern** within a Ø44mm area on a Ø49mm perforated face. The conical
section is the detail that matters: each hole widens on the way out, so flow
accelerates through the floor rather than stalling at the exit.

## Heights in the M series

| Code | Height | Dark | Medium | Light |
|---|---|---|---|---|
| [B702TH22.5M](/baskets/ims-b70-competition-2-cup-h22-5-m/) | 22.5mm | 13.5/15.5 g | 14.5/16.5 g | 17/19.5 g |
| [B702TH24.5M](/baskets/ims-b70-competition-2-cup-h24-5/) | 24.5mm | 16/18 g | 17/19 g | 20/22.5 g |
| [B702TH26.5M](/baskets/ims-b70-competition-2-cup-h26-5/) | 26.5mm | 18/20 g | 19/21 g | 22/24 g |
| [B702TH28.5M](/baskets/ims-b70-competition-2-cup-h28-5-m/) | 28.5mm | 20/22 g | 21/23 g | 24/26 g |

Pick by dose. Note how far roast level moves the figure — the same basket takes
several grams more of a light roast than a dark one, because lighter beans are
less dense.

Same official B70 compatibility as the rest of the series. Gaggia machines take
the narrower B68 series and are deliberately not cross-referenced.

## Sources

- https://www.imsfiltri.com/filters/B702TH28.5M.html
  - Official IMS Filtri product page ('B702TH28.5M'), read firsthand 2026-08-21. Specs verbatim: 'Border: Ø 70 mm', 'Body: Ø 60 mm', 'Height: 28.5 mm', tamper 'Ø 58/58.4 mm', 'Ridge: External Ø 60.5 mm', 'Holes: 641 (M Pattern)' over a 'Perforated Area: Ø 49 mm', with the 'M pattern in Ø 44 mm', 'Hole Diameter: 0.30 mm', shape 'Circular with Conical cross section'. The page's M-series capacity table gives this height as 20/22 gr (dark roasted), 21/23 gr (medium) and 24/26 gr (light), within a family of four: B702TH22.5M, B702TH24.5M, B702TH26.5M and B702TH28.5M.
- https://www.imsfiltri.com/IMS-competition-Catalogue.pdf
  - Official IMS Competition Series catalogue, read firsthand 2026-07-04, whose 'For tamper 58 / 58.4' B70 compatibility list names La Marzocco, Rancilio, Lelit, Rocket, ECM and 'BREVILLE (The Oracle)' among the fitting brands — and 'FLAIR ESPRESSO (58)', which is why the Flair 58 is cross-referenced here; Gaggia is assigned to the narrower B68 series, so B70 baskets do not cross-reference Gaggia machines.

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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.