The ridge is a spring catch, not an extraction spec. Ridgeless knocks cleaner and comes out of the portafilter easier. Ridged stays put if your spring is tired. Taste is not the claimed mechanism. A Gaggia Classic still needs a Gaggia-lug 58 mm handle; HomeBaristaMods’ bottomless set is €59. VST and IMS print both ridge styles on the same 18 g / 20 g / 22 g range.
The ranking thread is “worth a VST,” then ridge
Organic #1 is “Vst basket. Worth it? If yes which size, ridged or ridgeless?” The useful split is: match the gram stamp to your dose (± about 1 g as a starting band), then pick ridge from the portafilter spring, not from a YouTube taste test.
| 宣称 | 真实 | 出处 | 差在哪 |
|---|---|---|---|
| Ridgeless extracts sweeter | Ridge is how the clip holds the cup. Holes and dose do extraction | r/espresso | Clip vs holes |
| Ridgeless always falls into the knock box | Weak springs pop ridgeless. Tight springs do not | Same thread (Rancilio vs ECM examples) | Spring tension |
| Any 58 mm VST is a Classic part | Height and rim still have to live in a Gaggia PF. Tall 22 g often wants bottomless | IMS B68 threads; €59 bottomless | Ears + height |
Stock Gaggia doubles are usually ridged. That is why a ridgeless cup feels “aftermarket” even when the diameter is still 58-class.
Classic-specific: height before ridge
A spouted Classic portafilter runs out of room on a tall competition cup. IMS discussion on this platform keeps pointing at B68 rims for Gaggia and warning that some B70 / E61 cups miss the stock spring — that is the next article, which IMS basket for a Classic. Ridge vs ridgeless is step two, after the cup actually seats.
Bottomless Gaggia-lug handles forgive taller baskets because there is no spout bridge. They do not change whether your knock-box spring is limp.
Tamper and ridge
A ridgeless wall is easier to wipe with a 58.5 mm tamper. A ridge can hide a ring of dry coffee. Neither fact tells you to tamp at 30 lb. Size the base first (58.5 vs 58).
Frequently Asked Questions
Does ridgeless taste better?
Not by the ridge. Holes, dose, and grind do. Ridge is retention.
Will a ridgeless 18 g VST stay in a Gaggia portafilter?
If the spring is healthy, yes. If the basket walks, buy ridged or a tighter spring, not a different roast.
What gram size should I buy?
Match the stamp to the dose you already pull. Forum starting band is about ±1 g of the rating, then adjust for roast density.
Do I need bottomless to use ridgeless?
No. Bottomless (€59 Gaggia set) is for seeing spray. It is not a ridge adapter.
Is HomeBaristaMods’ 58 mm basket an IMS ridgeless?
The site’s Classic 58 mm basket accessory is not sold as an IMS code. Do not relabel it as B68 or VST.
Baskets and handles: brewing tools. If the group leaks around the ears, that is a gasket, not a ridge.