EspressoFit

IMS B70 Competition Convex 2 Cup H24 (B702TCH24E)

verified · 11 August 2026
Border Ø 70mmTamper Ø 58mm24mmBody Ø 60mm
Cross-section to scale, from the dimensions IMS publishes for this basket. The border is what seats in the portafilter — not the tamper figure the size is usually quoted by. See why “58mm” isn’t one standard.

That model name is an IMS product code — series, cup count, height and hole pattern are all encoded in it. IMS basket codes, decoded explains how to read one, and lists every code covered here.

This basket is one of a line. See every IMS B70 Competition basket compared — the whole ladder of heights and variants on one page, with the three diameters they share.

Fits these machines

The 24mm height in IMS’s B70 convex competition line — the middle of the range, and the closest convex equivalent to a conventional 18g double.

A convex basket has a raised centre to the floor, so the puck is fractionally thinner in the middle than at the edges. The intent is to counter the tendency of water to find the centre first: the shorter path through the middle is also the denser one, which evens out flow across the bed.

Geometry is otherwise standard B70 — Ø70mm border, Ø60mm body, ridgeless, 715 holes of 0.30mm over a Ø49mm perforated area, for a Ø58/58.4mm tamper.

IMS publishes the whole convex family’s capacities on one table, and the heights are a dose ladder rather than quality steps:

Code Height Dark Medium Light
B702TCH20E 20mm 10/12 g 11/13 g 14/17 g
B702TCH22E 22mm 12/14 g 13/15 g 16/19 g
B702TCH24E 24mm 14/16 g 15/17 g 18/21 g
B702TCH26E 26mm 17/19 g 18.5/21 g 20.5/23 g
B702TCH28.5E 28.5mm 19/22 g 22/25 g 23/27 g

Pick by the dose you actually pull. Note how much the roast level moves the figure — the same basket takes several grams more of a light roast than a dark one, because lighter beans are denser.

Ridgeless, so it suits a bottomless portafilter well. Same official B70 compatibility as the rest of the series; Gaggia machines take the narrower B68 series and are deliberately not cross-referenced.

Find the IMS B70 Competition Convex 2 Cup H24 (B702TCH24E) on Amazon (affiliate link — see our disclosure)

Also fits the same machines

Other items confirmed to fit machines this one fits — useful if you're kitting out a single setup. The count is how many of those machines overlap; nothing here is a new fitment claim.

FAQ

What size portafilter is the IMS B70 Competition Convex 2 Cup H24 (B702TCH24E) for?
It is a 58mm basket, 24mm deep, for 58mm portafilters.
Is the IMS B70 Competition Convex 2 Cup H24 (B702TCH24E) pressurized?
No — it is a non-pressurized (single-wall) basket, for freshly ground coffee.
Does the IMS B70 Competition Convex 2 Cup H24 (B702TCH24E) 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 H24 (B702TCH24E) fit?
Breville Oracle; ECM Estetika; ECM Mechanika MAX II; Flair 58; 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

Spot an error? The fastest fix is the source itself —send us the manufacturer page that contradicts this entry and we'll correct it and cite it. See how we verify.