# IMS B68 Competition Convex 2/3 Cup (B682TCH26.5E)

> Espresso compatibility data from EspressoFit. Confidence: **manufacturer (Tier 1 — manufacturer primary source read firsthand)**.
> Sources last read firsthand: 2026-07-06.
> Canonical page: https://espressofit.com/baskets/ims-b68-competition-2-cup-convex/

## Specifications

- **Diameter:** 58 mm
- **Depth:** 26.5 mm
- **Type:** non-pressurized (single-wall)
- **Brand:** IMS

## Fits these machines

- Gaggia Classic GT (58mm portafilter) — https://espressofit.com/machines/gaggia-classic-gt/
- Gaggia Classic Pro (E24) (58mm portafilter) — https://espressofit.com/machines/gaggia-classic-pro/

## Notes

The convex-bottom, higher-capacity sibling of the B682TH24.5M in IMS's
Gaggia-fit B68 series (Ø 68mm border, 2mm narrower than the B70, standard
Ø 58mm tamper). At 26.5mm height it takes larger doses than the 24.5mm
variant — IMS rates it 17-23g depending on roast — so check headroom against
the stock Gaggia shower screen with bigger doses. Verified against the
official IMS product page and catalogue on 2026-07-06.

## Sources

- https://www.imsfiltri.com/filters/B682TCH26.5E.html
  - Official IMS Filtri product page ('Competition - Convex Bottom', B68 2/3 cups), read firsthand 2026-07-06. Specs verbatim: 'Border: Ø 68 mm', 'Body: Ø 60 mm', 'Height: 26.5 mm', tamper 'Ø 58 mm', ridgeless, convex bottom that 'collects coffee towards the center', '715 holes in hexagonal pattern' of Ø 0.30 mm over a 'Ø 49 mm area optimized for convex shape'. Capacity 17/19g (dark roast) to 20.5/23g (light roast). IMS migrated its product URLs in 2026; this citation was repointed from the original imsfiltri.com/prodotto/ address to the canonical page that address now redirects to, re-checked 2026-07-26 (same product page, content unchanged). Amazon listing verified firsthand 2026-08-03: 'Classic IMS Competizione B682TCH26.5E Triple Shot 16g-22g Basket.' — the B682TCH26.5E code in the listing title matches this entry exactly, TC convex profile included. Add-to-cart present, i.e. actually buyable, at the time of checking.
- https://www.imsfiltri.com/IMS-competition-Catalogue.pdf
  - Official IMS Competition Series catalogue, read firsthand 2026-07-04: 'B68 (BORDER Ø 68 mm) CARIMALI, GAGGIA, LA CIMBALI. The body of B68 filters is the same as B70 filters but with a border that is 2 mm narrower for a better fit in portafilters of the quoted brands.'

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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.