1Zpresso J-Ultra vs J-Max: What Changes for Espresso?
A model-specific comparison of adjustment, ergonomics, and availability, researched from the 1Zpresso J-Max and J-Ultra manuals, the 1Zpresso store, and published reviews.
Quick Answer
The 1Zpresso J-Ultra is the successor to the J-Max. The J-Ultra moves the burr 8 microns per click across 100 clicks per turn; the J-Max moves 8.8 microns per click across 90 clicks per turn. Both grinders cover about the same burr travel per rotation, so espresso range is similar, but the J-Ultra gives slightly finer steps and is the model 1Zpresso still sells. To convert a J-Max setting, multiply its click count by 1.1.
Already own a J-Ultra? The 1Zpresso J-Ultra grind settings for espresso guide covers zeroing, the R.N.C notation, and a starting espresso range.
1Zpresso J-Ultra vs J-Max Spec Comparison
The adjustment figures below come from the 1Zpresso J-Max user manual and the 1Zpresso J-Ultra user manual. Burr travel per rotation and total clicks are multiplied out from those published numbers.
| Spec | J-Max | J-Ultra |
|---|---|---|
| Burr movement per click | 8.8 µm | 8 µm |
| Clicks per rotation | 90 | 100 |
| Burr travel per rotation | 792 µm | 800 µm |
| Rotations stated in manual | 4.5 | 5 |
| Zero-point tolerance | ±10 clicks | ±10 clicks |
| Burr | Not listed in the J-Max manual | 48 mm titanium coated (Sigma Coffee) |
| Foldable handle | J-Max S only | Yes |
How the J-Ultra and J-Max Adjustment Steps Differ for Espresso
The J-Ultra's main espresso change is step size. Each J-Ultra click moves the burr 8 microns, and each J-Max click moves it 8.8 microns, so one J-Ultra click is about 9% smaller than one J-Max click. Sigma Coffee's J-Ultra review describes the J-Ultra as a facelifted J-Max S with the step reduced from 8.8 to 8.0 microns.
Per full turn, the two grinders are almost identical: 792 microns on the J-Max versus 800 microns on the J-Ultra. That means the J-Ultra does not reach a different espresso range. It divides roughly the same range into 100 finer slices instead of 90.
In practice, the J-Ultra step difference matters most when a J-Max espresso shot sits between two clicks, one running slightly fast and the next slightly slow. The J-Ultra gives an intermediate position; the J-Max forces a choice or a dose change.
Converting a J-Max Espresso Setting to the J-Ultra
J-Max and J-Ultra click numbers do not match, because the clicks are different sizes. To move a J-Max espresso setting to a J-Ultra, multiply the J-Max total clicks from zero by 1.1 (8.8 ÷ 8). To go the other way, divide J-Ultra clicks by 1.1.
| J-Max clicks from zero | Burr travel | Equivalent J-Ultra clicks |
|---|---|---|
| 70 | 616 µm | 77 |
| 90 (one rotation) | 792 µm | 99 |
| 110 | 968 µm | 121 |
| 130 | 1,144 µm | 143 |
Count J-Max clicks as 90 per rotation, not 100: a J-Max reading of one rotation plus 20 clicks is 110 clicks. Both the J-Max manual and the J-Ultra manual say the zero point can shift by about 10 clicks depending on how tightly the nut and dial are fastened, so a converted J-Ultra setting is a starting point for dialing in, not an exact match.
J-Ultra vs J-Max Ergonomics and Design Changes
The J-Max line changed in two steps. Sigma Coffee reports that the J-Max launched in 2021, then the J-Max S added a frosted acrylic lid, a foldable crank handle, and a catch cup with a rubberised bottom. The J-Ultra then rounded the body and cut the click size.
- J-Ultra body: a rounded body with curved edges, per the 1Zpresso J-Ultra product page.
- J-Ultra catch cup: a magnetic, twist-off catch cup holding 35–40 g of grounds (1Zpresso), enough for a double espresso dose.
- J-Ultra weight: 700 g (1Zpresso).
- Handle: the foldable handle appears on the J-Max S and the J-Ultra; the original J-Max uses a fixed crank (J-Max manual).
- Zeroing and disassembly: both manuals use the same counterclockwise-to-resistance zero, pyramid rotation marker, and tool-free burr removal, so J-Max owners already know the J-Ultra routine.
Buying a 1Zpresso J-Max or J-Ultra Today
Availability is the practical J-Max versus J-Ultra difference for most buyers. The 1Zpresso J-Ultra product page lists the J-Ultra at $199 USD in Iron Gray and shows it in stock. The former 1Zpresso J-Max product URL now redirects to a J-Max S spare parts page selling items such as the adjustment dial ring, catch cup, and handle.
A J-Max today is mostly a used or leftover-stock purchase. That makes a J-Max worth considering only when the price sits clearly below the J-Ultra's, and spare parts remain available from 1Zpresso for J-Max S owners.
Which 1Zpresso Grinder to Choose for Espresso: J-Ultra or J-Max
- Buying new: choose the J-Ultra, since it is the J-Max successor 1Zpresso currently sells.
- Already own a J-Max: keep the J-Max unless shots regularly fall between two clicks; the J-Ultra's range per turn is nearly the same.
- Found a cheap used J-Max: a J-Max covers the same espresso range with 8.8-micron steps, which is still fine adjustment for home espresso.
- Brewing filter coffee too: compare the 1Zpresso X-Ultra vs J-Ultra before choosing an espresso-focused J model.
For other options, see the best hand grinder for espresso guide, and after switching grinders use how to dial in espresso on a new grinder.
1Zpresso J-Ultra vs J-Max FAQ
What is the difference between the 1Zpresso J-Ultra and J-Max?
The 1Zpresso J-Ultra moves the burr 8 microns per click with 100 clicks per rotation, while the J-Max moves 8.8 microns per click with 90 clicks per rotation, according to the 1Zpresso manuals. The J-Ultra also has a rounder body, a magnetic catch cup, and a foldable handle.
Is the 1Zpresso J-Ultra better than the J-Max for espresso?
The 1Zpresso J-Ultra gives finer espresso adjustment steps (8 microns versus 8.8 microns) and is the model 1Zpresso currently sells. A J-Max owner already pulling good shots gains only a small step-size refinement by upgrading.
Can I use J-Max grind settings on the J-Ultra?
Not directly. Multiply a J-Max click count by 1.1 to get the same burr travel in J-Ultra clicks, because 8.8 divided by 8 equals 1.1. Treat the result as a starting point, since both 1Zpresso manuals say zero can vary by about 10 clicks.
Is the 1Zpresso J-Max discontinued?
1Zpresso's J-Max product URL now redirects to a J-Max S spare parts page, and Sigma Coffee describes the J-Ultra as the current iteration of the J-Max line. New J-Max stock is mostly limited to remaining retailer inventory and the used market.
Related: 1Zpresso J-Ultra espresso settings · 1Zpresso JX-Pro grind settings · 1Zpresso K-Max grind settings