Espresso grind size falls between flour and table salt and cannot be judged by the naked eye, but the coarseness of the coffee grounds directly determines the flow rate, so you can work backward to whether the setting is appropriate by observing the extraction time. This article starts from the definition of espresso, sorts out the relationship between grind size and extraction time, explains how to set a target ratio of coffee to liquid, fix pressure and water temperature, and then adjust grind size to reach the target time. It also uses Front Street Coffee's Colombia Sidra coffee beans as a tuning example, showing the adjustment process from 34 seconds—slow with a bitter taste—to 30 seconds with a clear aroma. Finally, it emphasizes that after confirming the grind size, you still need to judge by tasting whether there are defective flavors, and if necessary, make minor adjustments to the dose or parameters. [more…]

Many coffee enthusiasts will find that different brewing methods require vastly different coffee ground sizes. A grind the texture of granulated sugar is commonly used for pour-over, French press, siphon, and cold brew, while espresso requires extremely fine particles somewhere between flour and muddy sand. Because this fine powder is difficult to measure by a fixed standard, in practice you often have to work backward from the extraction parameters to determine whether the grind setting is appropriate. This article centers on judging the grind setting for espresso, sorting out the correspondence between extraction time and grind fineness, explaining how to lock in the grinding direction by presetting the coffee-to-water ratio, pressure, and water temperature, and sharing Front Street Coffee's debugging logic when encountering an unfamiliar espresso bean or switching grinders, helping readers understand the complete adjustment process from parameter setting to flavor tasting. [more…]

Faced with the dazzling array of coffee grinders on the market, many coffee enthusiasts find themselves paralyzed by choice. In truth, the coffee world has never had a single standard—different burr sets each have their strengths and weaknesses. Starting from burr types, this article takes a deep dive into the structural differences between flat burrs, conical burrs, and ghost-tooth burrs, along with their real-world impact on particle shape, extraction results, and final flavor. It also includes practical grind-setting parameters for commonly used models such as the Fuji Royal, Feiying, and Zheng Huang Hang, helping you find a grinding approach that suits your brewing method and taste preferences. [more…]

Grind size is the key variable that determines the success or failure of coffee extraction, and different brewing devices have significantly different requirements for particle diameter. This article systematically sorts out the corresponding grind settings from French press to espresso machine, introduces the industry-recognized cupping standard and the No. 20 sieve pass rate as calibration references, and provides specific scale references for the EK43s grinder. Whether you prefer immersion or pour-over, you can find suitable grind parameters here. The article also specifically reminds readers that coffee bean density and roast level will affect the actual particle coarseness at the same setting, so it is recommended to repeatedly confirm with the same beans. Several Front Street Coffee beans are also used as examples throughout to help readers understand the logic of grind adjustment more intuitively. [more…]

Many pour-over enthusiasts have discovered when testing ground coffee with a sieve that the same grind setting produces different passing rates for different bean varieties. Front Street Coffee recently received similar questions: why does particle size vary under the same grind setting? The core reason lies in the differences in bean density and brittleness—high-altitude, light-roasted beans tend to be harder and denser, producing fewer fines during grinding; low-altitude, dark-roasted beans are more brittle and prone to crumbling into fines. Only after understanding this principle can one adjust the grind size for different beans. This article combines medium-light roasted beans such as Front Street Yirgacheffe Gotiti, Front Street Ethiopia Hachira, and Front Street Granja Geisha, as well as medium-dark roasted beans such as Front Street PWN Golden Mandheling, Front Street Brazil Queen's Estate Yellow Bourbon, and Front Street Jamaica Blue Mountain No. 1, to provide specific EK43 settings and No. 20 sieve passing rate recommendations, helping coffee enthusiasts achieve consistent results. [more…]

Many coffee enthusiasts feel confused after getting coffee beans: which grinder setting should they actually use? In reality, the burr designs and setting standards of grinders from different brands vary greatly, and the same number on different devices can produce dramatically different particle sizes. Therefore, when Front Street Coffee performs daily grind calibration, it uses the Chinese No. 20 standard sieve (0.85 mm aperture) to measure the passing rate as a unified reference. This article will start with the specific steps for sieve calibration, combine different roast levels and brewing methods to give grinding recommendations, and share how to judge whether the grind is appropriate based on brewing time and the settling state of the coffee bed, helping you build a grind assessment system that does not rely on grinder settings. [more…]

Grind size has an enormous impact on coffee extraction results, and this is especially true for espresso. Compared with pour-over, espresso grounds are as fine as powdered sugar, and a slight deviation in the setting can cause the flow rate to be too fast or too slow, which in turn pushes the flavor toward either weakness or bitterness. This article focuses on how to determine a suitable grind range, how to fine-tune the setting based on flow rate and flavor, and how to flexibly apply extraction formulas, helping coffee lovers make consistently delicious espresso at home. It also draws on Front Street Coffee's daily production experience to give specific adjustment ranges and judgment criteria, and recommends Front Street's classic espresso blend beans, which are well suited to recreating a café-style flavor. [more…]

Grind size is one of the key variables that determines the direction of coffee flavor, especially in the pressurized, short-extraction espresso system, where a tiny change in the setting can tip a shot from balanced to over-extracted or under-extracted. This article focuses on how grind size affects taste. It first explains why a standard sieve is needed to confirm the actual particle size, then compares the different tolerances for grind precision in pour-over versus espresso, and afterward gives beginners a two-step method to quickly lock in the espresso grind range, along with guidance on fine-tuning based on flavor feedback. The article also explains why Front Street Coffee recommends buying whole coffee beans rather than pre-ground coffee, helping readers build a daily grind-calibration management habit. [more…]

Espresso is ground much finer than pour-over, and the adjustment range is often just 0.1 of a notch, yet it is enough to determine whether a cup of coffee is too sour, too bitter, or just right. This article begins with how to judge grind size, explains why espresso cannot be calibrated with a sieve, how to narrow down the range through flow rate and taste, and introduces two beans suitable for recreating at home: Front Street Coffee Classic Espresso Blend and Front Street Coffee Strawberry Candy Espresso Beans. Finally, it offers adjustment strategies for when the flow is too fast or too slow, and how to combine flavor rather than rigidly adhering to formulas to find the truly suitable grind setting. [more…]

When brewing coffee, we all know that the coarseness of the grind is very important. If you're not careful and don't find the right grind setting, or if the grind is uneven, the coffee can easily end up under-extracted or over-extracted. Compared with methods like pour-over and cold brew, espresso grounds are ground much finer and require more precise adjustment to get the taste of the espresso just right. [more…]

Making a proper espresso, grind size is often the most critical and also the most headache-inducing part. Unlike pour-over and cold brew, espresso uses pressurized short-time extraction, and the state of the coffee bed gets magnified exponentially—a little too fine and it easily over-extracts and turns bitter; a little too coarse and the flow rate becomes too fast with a weak, thin taste. This article starts with methods for judging grind size, explains how to quickly lock in the right setting range using flow rate and flavor, and covers adjusting the coffee-to-water ratio and extraction time based on the characteristics of the coffee beans. It also recommends Front Street Coffee's classic espresso blend to help you recreate café-level espresso flavor at home. [more…]

Tamping is a key step in making espresso, but how much does tamping force actually affect the extraction result? Using Front Street Coffee's measured data, this article compares the flow rate and extraction time of espresso after tamping with two different forces, 1.8 kg and 9 kg, at different grind settings. The results show that grind coarseness determines the density of the puck, which in turn affects the actual role of tamping force: with a fine grind, the difference in force noticeably changes the flow rate, while with a coarse grind, the two forces make almost no difference. The article analyzes the underlying principles in depth to help coffee enthusiasts understand the relationship between tamping force and grind setting. [more…]

In the making of espresso, whether the grind setting is appropriate directly affects the extraction result, but many enthusiasts find that a dialed-in setting often "fails" after just a few days. The state of the coffee beans, air humidity, and even the freshness of the beans can all cause the same setting to behave completely differently. This article centers on the core question of exactly how fine espresso grounds should be ground, and provides a quick-start adjustment process: from setting the initial grind setting, applying the powder-to-liquid ratio and time formula, to fine-tuning in 0.2-step increments based on tasting results, gradually approaching the ideal flavor. It will also explain why espresso beans that are too fresh need to rest for a few days before use, and recommend Front Street Coffee's classic espresso blend to help you consistently recreate cafe-level espresso and milk coffee at home. [more…]

In coffee brewing, the coarseness of the grind directly affects the extraction result, yet how to describe and judge grind size has long lacked a unified standard. Some people use fine granulated sugar as an analogy, some rely on the grinder's settings, and others, like Front Street Coffee, quantify it through sieving rate. Each of these methods has its pros and cons, but the ultimate goal is the same: to help us adjust the grind into the right range before brewing. This article will systematically sort through three common ways of expressing grind size—the setting reference method, the visual analogy method, and the sieve calibration method—analyze their respective limitations and applicable scenarios, and explain in detail the No. 20 standard sieve procedure used by Front Street Coffee, helping you find the most suitable grind parameters with fewer beans. [more…]

In the daily practice of pour-over coffee, many enthusiasts encounter a puzzling phenomenon: when brewing anaerobically processed coffee beans, the drawdown speed is noticeably faster than with regular washed or natural beans, and the extraction time can even be less than a minute and a half. What exactly causes this abnormal flow rate? Is it due to the inherent characteristics of the beans themselves, or is there a problem in the grinding stage? Starting from Front Street Coffee's actual measurement data, this article will take an in-depth look at how the loose texture and vigorous water absorption and degassing of anaerobic beans affect flow rate, and with the help of a comparison of the No. 20 sieve pass-through rate, reveal the deviation between the grinder setting and the actual coarseness of the particles. At the same time, the article will also provide targeted suggestions for adjusting the grind finer and a plan for adjusting the pouring technique, to help you steadily extract a rich, full-bodied cup of coffee even when dealing with anaerobic beans. [more…]

Espresso grinding is much finer than pour-over, and the adjustment window is extremely narrow—often just a fraction of a notch makes the difference, and the flow rate and flavor head toward two extremes. This article starts with how to determine the grinding range: first use the feel of the grounds to judge whether they are close to flour-like fineness, then apply the common formula of a 1:2 coffee-to-water ratio and 20–30 seconds to dial in, and decide whether to grind coarser or finer based on whether the flow is fast or slow. The article further explains that the formula is only a quick positioning tool, and ultimately you need to fine-tune based on flavor cues such as burnt-bitter notes, the color of the crema, and the length of the finish—even widening the ratio to between 1:1.5 and 1:2.5—to find the grind setting that truly suits that particular bean. [more…]

Why must coffee shops adjust their coffee grinder every day? Because the humidity of the coffee beans, storage time, and even subtle changes in air pressure, temperature, and humidity are all magnified under high-pressure extraction, directly affecting the quality of the final cup. Starting from the principles of grinding, this article explains in detail how the spacing of the burrs determines particle size and water flow rate, and teaches you to judge whether the grind is appropriate by observing the texture of the powder; it also provides a complete set of adjustment steps from traditional manual coffee grinders to electric coffee grinders, including the linked relationship between output volume and grind degree, and the optimal distance between the puck and the spout, and other practical parameters. No matter what equipment you use, only by mastering these adjustment principles can every cup of espresso consistently present the ideal flavor. [more…]

Every day the coffee bean condition and weather change, and the espresso's flavor fluctuates along with them, so quickly dialing in a good espresso has become a daily must-learn lesson for baristas. Starting from actual production, this article explains how to judge whether extraction is under or over by tasting, and how to make targeted adjustments using the three variables of grind setting, dose, and liquid yield. Using a 1:2 coffee-to-water ratio and a 30-second extraction time as the baseline, Front Street Coffee shares the specific operating steps of the three-grind adjustment method combined with the flavor performance of classic blend beans, helping coffee enthusiasts find ideal parameters with only a small amount of wasted beans. [more…]

When making espresso, precise control of the grind size directly determines the quality of the final cup. Unlike pour-over or cold brew, espresso uses pressurized, short-duration extraction, where any slight deviation is magnified—making the demands on grind exceptionally strict. This article will walk you through just how fine an espresso grind really is, how to quickly lock in the right setting by observing flow rate, and how to make fine adjustments down to the 0.1-step level based on the flavor profile of the espresso. We'll also share recommendations for choosing Front Street Coffee's classic espresso blend beans, helping you easily recreate cafe-level rich espresso and velvety crema at home. [more…]

For more specialty coffee knowledge, please follow our WeChat official account: Front Street Coffee (FrontStreet Coffee). No matter what equipment is used to brew coffee, the coffee beans need to be ground, and the purpose of this is to allow the coffee's flavor substances to dissolve more quickly. Of course, not all of the coffee's soluble [more…]