IMS Competition Precision Basket 58 mm Convex H24

Achieve a precise and consistent foundation for your espresso with the IMS Competition B702TCH24E. This filter basket combines a cylindrical shape with a convex bottom, 715 precision-engineered holes, and a ridgeless construction without an external retention groove.

The basket is 24 mm high and designed for 58–58.4 mm tampers. Its capacity makes it suitable for standard double espresso portions, though the optimal dosage depends on the coffee's roast level, density, and grind size.

Convex bottom with centered flow

The B702TCH24E features a slightly curved, convex bottom. This shape is designed to make the most of the coffee puck and direct the espresso flow toward the center of the basket.

The convex construction can contribute to:

• A centered flow

• Efficient utilization of the coffee puck

• Easier drying of the used puck

• Easier removal of the puck after brewing

• A clear flow when using a bottomless portafilter

  The basket can also be used in compatible spouted portafilters, provided the portafilter has sufficient clearance for the basket's height and curved bottom.

  715 precision-engineered holes

  The bottom of the basket has 715 holes with a diameter of 0.30 mm. The holes are arranged in a hexagonal pattern over a perforated area with a diameter of 49 mm.

  As part of the IMS Competition series, the perforation is re-laminated and calibrated after manufacturing. This provides a high degree of uniformity between the holes and a stable foundation for espresso extraction.

  The precise perforation makes it easier to work systematically with:

  • Grind size

  • Dosage

  • Distribution of the coffee

  • Brew time

  • Yield

  • Coffee-to-espresso ratio

  A precision basket cannot prevent channeling on its own. A consistent grind size, thorough distribution, and level tamping remain essential.

  Recommended dosage

  IMS specifies different dosage ranges depending on the coffee's roast level:

  • Dark roast: approximately 14–16 g

  • Medium roast: approximately 15–17 g

  • Light roast: approximately 18–21 g

  Light-roasted coffee beans typically have a higher density and therefore occupy less space by weight than dark-roasted beans.

  The dosage ranges are guidelines. The optimal coffee quantity also depends on the grind size, coffee density, and the distance between the tamped coffee puck and the machine's shower screen.

  Feel free to start at the lower end of the recommended range and check that the coffee puck does not touch the brew head.

  For 58 and 58.4 mm tampers

  IMS specifies the basket for tampers with a diameter of 58 or 58.4 mm.

  A tight-fitting tamper helps compress the coffee evenly all the way to the edge of the basket. This reduces the amount of loose coffee along the sides and makes it easier to create a level coffee puck.

  The 58 mm designation does not automatically mean that the basket fits all espresso machines with a 58 mm brew head.

  Therefore, check the following dimensions:

  • Outer rim: 70 mm

  • Basket body: 60 mm

  • Height: 24 mm

  • Tamper size: 58–58.4 mm

  It is recommended to compare these dimensions with your current filter basket before ordering.

  Ridgeless construction

  The B702TCH24E is ridgeless and therefore has no external retention groove.

  The smooth exterior makes it easier to insert and remove the basket from the portafilter. The basket is held in place by the portafilter's spring, so the tightness of the fit depends on the size and strength of the spring.

  Electropolished surface

  The filter basket has an electropolished surface that reduces microscopic imperfections and provides a smooth finish.

  This surface treatment makes the basket easier to clean and helps limit the buildup of coffee oils and fine coffee particles.

  As part of the finishing process, the basket also undergoes a wet vibro-finishing treatment with ceramic elements.

  Suitable for a bottomless portafilter

  The convex bottom directs the espresso flow toward the center, making the basket particularly suitable for a bottomless portafilter.

  A bottomless portafilter makes it easier to observe:

  • If the extraction starts evenly

  • If the espresso converges toward the center

  • If channeling occurs

  • If the tamping is uneven

  • If coffee distribution needs adjustment

  However, a bottomless portafilter is not required to use the basket.

  How to achieve a great result

  1. Select a starting dosage based on the coffee's roast level.

  2. Distribute the ground coffee evenly in the basket.

  3. Optionally, use a WDT tool to break up clumps.

  4. Tamp level with a suitable 58 or 58.4 mm tamper.

  5. Check the distance between the coffee puck and the brew head.

  6. Brew the espresso and evaluate the flow, brew time, and taste.

  7. Adjust primarily the grind size while keeping the dosage stable.

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  Cleaning and maintenance

  Knock out the coffee grounds after each brew and rinse the filter basket thoroughly with hot water. Regularly check that the small holes are not clogged by coffee oils or fine coffee particles.

  For deep cleaning, the basket can be soaked in a suitable cleaning agent for espresso and coffee equipment. Follow the cleaner's instructions and rinse the basket thoroughly with clean water afterward.

  Avoid needles, steel brushes, and other sharp tools that may damage or alter the shape of the micro-holes.

  Specifications

  • Brand: IMS

  • Series: Competition Convex

  • Model number: B702TCH24E

  • Product type: Precision espresso basket

  • Capacity: Double espresso / 2 cups

  • Height: 24 mm

  • Outer rim: 70 mm

  • Basket body: 60 mm

  • Tamper size: 58–58.4 mm

  • Bottom: Convex

  • Retention groove: No – ridgeless

  • Number of holes: 715

  • Hole diameter: 0.30 mm

  • Perforated area: 49 mm

  • Hole pattern: Hexagonal

  • Hole cross-section: Conical

  • Surface treatment: Electropolished

  • Recommended dose, dark roast: 14–16 g

  • Recommended dose, medium roast: 15–17 g

  • Recommended dose, light roast: 18–21 g

  • Portafilter included: No

  • Tamper included: No

  The IMS Competition B702TCH24E is an ideal choice for the espresso enthusiast who wants a compact, ridgeless precision basket with a convex bottom, consistent perforation, and the capacity for a double espresso.

  Frequently asked questions

  How much coffee fits in the IMS B702TCH24E?

  IMS recommends approximately 14–16 g for dark-roasted coffee, 15–17 g for medium-roasted coffee, and 18–21 g for light-roasted coffee. The optimal dosage also depends on the grind size and the density of the coffee.

  Which tamper fits the basket?

  The basket is designed for tampers with a diameter of 58 or 58.4 mm. A tight-fitting tamper makes it easier to compress the coffee evenly all the way to the edge.

  Does the basket fit all 58 mm espresso machines?

  No. You must also check the basket's outer rim of 70 mm, the body diameter of 60 mm, and the height of 24 mm. Additionally, the portafilter must have enough clearance for the convex bottom.

  What does a convex bottom mean?

  The convex bottom is slightly curved and directs the espresso flow toward the center of the basket. The shape is particularly suitable for use with a bottomless portafilter.

  What does ridgeless mean?

  Ridgeless means the basket has no external retention groove. Instead, the portafilter's spring holds it in place around the basket's smooth exterior.

  How many holes does the filter basket have?

  The basket has 715 precision-engineered holes with a diameter of 0.30 mm.

  Does the precision basket prevent channeling?

  Not on its own. The uniform perforation provides a precise foundation, but grind size, dosage, distribution, and level tamping are still essential.

  Can the basket be used in a spouted portafilter?

  Yes, provided the portafilter has sufficient diameter and depth for the basket's height and convex bottom. Compare the dimensions with your existing basket before purchasing.

  Are a portafilter or tamper included?

  No. The product consists only of the IMS filter basket. A portafilter, tamper, and other espresso equipment are sold separately.