The Flair 58 uses a 58mm portafilter (58mm (manual lever)).
Do standard 58mm baskets fit the Flair 58?
Yes — the Flair 58 uses the 58mm commercial standard, so standard 58mm baskets fit. Depth and shape still vary between baskets, so check the individual entries below.
Does the Flair 58 take pressurized or non-pressurized baskets?
It uses non-pressurized baskets.
Sources
https://flairespresso.com/product/flair-58/(archived) — Official Flair Espresso shop page, read firsthand 2026-07-04. States verbatim: '58 mm Portafilter and 16-22 gram basket (additional high-flow basket available)', 'Dose – 16-20 grams (expandable with different baskets)', and 'Use any standard 58mm portafilter basket, tamping & distribution tools'. Page description calls it 'an industry standard 58mm portafilter'.
https://flairespresso.com/products/espresso-makers/flair-58/(archived) — Official Flair Espresso product page, read firsthand 2026-07-04. States verbatim: 'enjoying the added benefit of an industry standard 58mm portafilter and preheat control system' and headlines 'Industry Standard 58mm Portafilter'.