Mythos Burrs: Understanding the Burrs Behind Nuova Simonelli's Famous Grinder

The Nuova Simonelli Mythos One (and its successor, the Mythos 2) became iconic in specialty coffee shops for a reason, and a big part of that reason is the burr set. The Mythos uses 75mm flat titanium-coated burrs that produce a grind profile tuned specifically for high-quality espresso. If you're researching Mythos burrs, you're probably either maintaining a Mythos grinder, considering an upgrade, or trying to understand why cafes swear by this machine. I'll cover all three angles.

I've worked with the Mythos in several cafe settings and used one in a home setup for testing. I'll explain what makes the Mythos burrs distinctive, how they perform compared to other sizes and coatings, when to replace them, and whether aftermarket options are worth considering.

The Stock Mythos Burr Specs

The Mythos One and Mythos 2 use 75mm flat burrs. This is an unusual size in the grinder world, where 64mm and 83mm dominate. The 75mm spec sits in between and was specifically chosen by Nuova Simonelli for this grinder platform.

Titanium Coating

The stock Mythos burrs feature a titanium nitride coating (the gold-colored finish you see on the burrs). This coating serves two purposes:

  1. Hardness: Titanium nitride is significantly harder than bare steel, which extends burr life. Coated burrs last roughly 2-3 times longer than uncoated steel before the cutting edges dull.
  2. Reduced friction: The coating creates a smoother surface that reduces heat buildup during grinding. Less heat means less thermal damage to the coffee grounds and more consistent flavor extraction.

The coating is thin (just a few microns) and wears away gradually. Once the gold color is gone in heavy-wear areas, the burrs are still functional but grinding closer to uncoated steel performance. At that point, replacement is recommended.

Burr Geometry

The Mythos burrs have a specific cutting geometry designed for espresso. The tooth pattern creates a particle distribution that leans bimodal, with a primary peak at the target grind size and a smaller peak of fines. This bimodal distribution is intentional. The fines fill gaps between larger particles in the espresso puck, creating resistance that builds the pressure needed for proper extraction.

The result is espresso with good body, rich crema, and balanced sweetness. The Mythos burr geometry is less focused on clarity than something like SSP High Uniformity burrs. If you want clean, transparent, origin-forward espresso, the Mythos isn't the best platform. If you want rich, sweet, full-bodied espresso with excellent texture, the Mythos burrs deliver.

How the Mythos Burrs Perform

In a Cafe Setting

The Mythos was designed for high-volume cafe use, and the burr performance reflects that. At 1,000+ doses per day, the Mythos maintains shot consistency remarkably well. The climate control system (a heating element in the burr chamber) keeps the grinding temperature stable, which prevents the thermal drift that plagues other grinders during busy periods.

I've seen cafes grind through hundreds of pounds of coffee before noticing any decline in burr performance. The titanium coating holds up well under commercial volume. Most busy cafes budget for annual burr replacements, but the actual replacement interval depends on the roast level (darker roasts wear burrs faster due to oils and brittleness).

At Home

At home volumes of 20-40 grams per day, Mythos burrs last for years. The performance stays consistent because you're not generating enough heat or wear to degrade the burrs meaningfully. If you have a Mythos at home (usually purchased used from a cafe), the stock burrs will likely outlast your interest in the grinder.

The grind quality at home is the same as in a cafe. You get that signature Mythos shot: rich, full-bodied, sweet, with excellent crema. The 75mm burrs grind quickly (about 3-4 seconds for an 18g dose), which is faster than most home 64mm grinders.

When to Replace Mythos Burrs

Knowing when to replace burrs is more art than science, but there are clear signs:

Visual Indicators

  • Coating wear: When the gold titanium coating is worn through on the cutting edges, the burrs are past their prime. Some wear is normal and doesn't mean immediate replacement, but once you see bare steel across most of the cutting surface, it's time.
  • Rounded edges: Hold the burr at an angle under good light. Sharp cutting edges reflect light as thin, crisp lines. Worn edges look rounded and dull.
  • Chipping: Any chipped teeth mean the burr is done. Chips create dead spots that produce uneven grinds.

Performance Indicators

  • Increased grind time: If the same setting takes noticeably longer to grind the same dose, the burrs are duller and cutting less efficiently.
  • Less clarity in the cup: Worn burrs produce more fines and a muddier flavor profile. If your espresso starts tasting flat and indistinct, check the burrs.
  • Difficulty dialing in: When you can't find a setting that produces a good shot, and you've ruled out bean freshness and machine issues, worn burrs are often the cause.

Replacement Intervals

  • High-volume cafe (5+ kg/day): Every 6-12 months
  • Medium-volume cafe (2-5 kg/day): Every 12-18 months
  • Low-volume/home use (<500g/day): Every 3-5 years, possibly longer

Replacement burrs from Nuova Simonelli cost about $80-120 for a pair. They're available from espresso equipment distributors and directly from Nuova Simonelli.

Aftermarket Burr Options

The 75mm burr size limits aftermarket choices compared to the 64mm and 83mm platforms where SSP dominates. However, a few options exist:

SSP 75mm Burrs

SSP does make 75mm burrs for the Mythos platform. They offer their standard geometries:

  • High Uniformity: For clarity-focused espresso and filter
  • Multi-Purpose: Balanced between body and clarity
  • Lab Sweet: Sweetness-forward with good body

SSP 75mm burrs cost $150-250 depending on the geometry. They fit the Mythos One and Mythos 2 without modification. The flavor change is significant: SSP HU burrs in a Mythos produce cleaner, more transparent espresso with less body but more distinct origin notes.

Whether this is an improvement depends on your preference. Many Mythos owners buy the grinder specifically for that rich, full-bodied espresso profile. Putting SSP HU burrs in a Mythos changes its character entirely. If you wanted clarity-focused espresso, there might be better grinder platforms to start with.

Ditting Burrs

Some Mythos owners have experimented with Ditting 75mm burrs, which are designed for Ditting's own grinder platform. Compatibility isn't guaranteed, and the bolt pattern may not match. This is a niche modification with limited community documentation. I'd stick with SSP or OEM Nuova Simonelli burrs unless you enjoy experimental projects.

For a broader perspective on grinder and burr options, our best coffee grinder roundup covers grinders across different burr platforms.

Maintenance Tips for Mythos Burrs

Daily

Purge the first 2-3 grams of grounds each morning. These retained grounds sat in the chamber overnight and will taste stale. Run them into the knock box, not into your portafilter.

Weekly

Brush the burrs with a stiff-bristled brush. Remove the top burr carrier (the Mythos makes this fairly accessible) and sweep out any packed grounds from the cutting faces and the surrounding chamber.

Monthly

Run grinder cleaning tablets (like Grindz or Full Circle) through the machine. These are food-safe tablets that absorb oils and clear residue from the burr faces and the grinding path.

Annually

Remove both burrs for a thorough inspection. Check the cutting edges under good light. Clean the entire grinding chamber. Check the motor bearings for any new vibration or noise. If you're in a commercial setting, this is when you decide whether replacement burrs are needed.

For more on grinder maintenance across different brands, check our top coffee grinder guide.

FAQ

Can I use Mythos burrs in other grinders?

No, 75mm burrs are specific to the Mythos platform. They won't fit 64mm or 83mm grinders, and the bolt pattern is Mythos-specific. If you have spare Mythos burrs and no Mythos grinder, they're only useful as replacements for another Mythos.

Are the Mythos 2 burrs different from the Mythos One burrs?

The Mythos 2 uses the same 75mm burr size and the same titanium coating. The burr geometry received minor refinements, but the burrs are interchangeable between the Mythos One and Mythos 2 in most cases. Check with your distributor to confirm compatibility for your specific serial number range.

How much do replacement Mythos burrs cost?

OEM replacement burrs from Nuova Simonelli cost about $80-120 for a pair. SSP aftermarket burrs run $150-250. Factor in a few dollars for shipping and you're looking at a very reasonable maintenance cost considering the replacement interval.

Do Mythos burrs work for filter coffee?

The stock Mythos burrs are optimized for espresso and don't perform as well at coarser filter settings. The particle distribution at coarse settings is less uniform, leading to uneven extraction in pour-over or batch brew. If you need filter grinding from a Mythos, SSP HU burrs handle the coarser range better than stock.

The Bottom Line

The Mythos burrs are purpose-built for rich, full-bodied espresso and they excel at that job. The titanium coating provides excellent longevity, the 75mm size offers a good balance between speed and quality, and the bimodal grind geometry creates the texture that made the Mythos a cafe staple. Maintain them properly, replace them on schedule, and they'll keep producing great espresso for years. If you want to change the Mythos's flavor character, SSP offers the best aftermarket alternative. But for the classic Mythos shot, the stock burrs are exactly right.