IMS’s B70-series competition basket for 58mm groups, in the 2-cup 26mm-height
convex variant (code B702TCH26E). The nominal 58mm size refers to the tamper
fit (IMS specifies Ø 58/58.4mm precision tampers); IMS’s own dimensions are
Ø 70mm border, Ø 60mm body, 26mm height. The machine cross-references follow
IMS’s official B70 compatibility list, which names La Marzocco, Rancilio,
Lelit, Rocket, ECM and ‘BREVILLE (The Oracle)’ explicitly — the Oracle is
Breville’s one 58mm machine; the 54mm Barista/Bambino lines are not B70
compatible. Deliberately NOT cross-referenced to the Gaggia Classic Pro:
IMS’s catalogue puts Gaggia in the B68 series, whose border is 2mm narrower
“for a better fit in portafilters of the quoted brands”. Verified against the
official IMS product page and Competition catalogue on 2026-07-04.
FAQ
What size portafilter is the IMS B70 Competition Convex 2 Cup (B702TCH26E) for?
It is a 58mm basket, 26mm deep, for 58mm portafilters.
Is the IMS B70 Competition Convex 2 Cup (B702TCH26E) pressurized?
No — it is a non-pressurized (single-wall) basket, for freshly ground coffee.
Does the IMS B70 Competition Convex 2 Cup (B702TCH26E) fit 54mm machines like the Breville Barista Express?
No. It is a 58mm basket, so it does not fit Breville's 54mm machines or any 54mm portafilter.
Which machines does the IMS B70 Competition Convex 2 Cup (B702TCH26E) fit?
Breville Oracle; ECM Estetika; ECM Mechanika MAX II; La Marzocco GS3; La Marzocco Linea Micra; La Marzocco Linea Mini; Lelit Bianca (PL162T); Lelit Elizabeth (PL92T); Lelit Kate (PL82T); Lelit MaraX (PL62X); Lelit Victoria (PL91T); Rancilio Silvia; Rancilio Silvia Pro; Rancilio Silvia Pro X; Rocket Espresso Appartamento; Rocket Espresso Epica; Rocket Espresso Giotto Fast; Rocket Espresso Mozzafiato Fast; Rocket Espresso Porta Via; Rocket Espresso R Nine One — each confirmed against manufacturer sources (listed below).
Sources
https://imsfiltri.com/prodotto/b702tch26e/(archived) — Official IMS Filtri product page, read firsthand 2026-07-04. Specs verbatim: 'Border: Ø 70 mm', 'Body: Ø 60 mm', 'Height: 26 mm', tamper 'Ø 58/58.4 mm', 715 holes of Ø 0.30 mm in a hexagonal pattern over a Ø 49 mm perforated area, ridgeless with a convex bottom. Capacity 17/19g (dark roast) to 20.5/23g (light roast) for 2 cups.
https://www.imsfiltri.com/IMS-competition-Catalogue.pdf(archived) — Official IMS Competition Series catalogue, read firsthand 2026-07-04. States verbatim under 'For tamper 58 / 58.4': 'B70 (BORDER Ø 70 mm) E61 & compatible groups like BELLEZZA, BEZZERA, BFC, BIANCHI, BRASILIA, BREVILLE (The Oracle), D.I.D., ECM, EXPOBAR, FAEMA, FIORENZATO, FLAIR ESPRESSO (58), GRIMAC, IBERITAL, KEES VAN DER WESTEN, LA MARZOCCO, LA NUOVA ERA, LA SCALA, LELIT, L'ORCHESTRALE, MARO, MAVAM, MERAKI, MR. CAFÉ, NUOVA SIMONELLI, PROFITEC, QUALITY ESPRESSO, QUICK MILL, RANCILIO, ROCKET, ROYAL FIRST, SAN REMO, SLAYER, SV-SAB, SYNESSO, VFA, VIBIEMME, VICTORIA ARDUINO, WEGA.' Note: Gaggia is NOT in the B70 list — IMS assigns Gaggia (with Carimali and La Cimbali) to its narrower Ø 68 mm B68 series.