GU63 Motor Power & RPM: Why the Specs Changed

Geimori Technical Clarification / GU63

If you have been following the Geimori GU63 for a while, you may have spotted something confusing. Earlier information mentioned 110 RPM, while our current specifications show 80 RPM. You may also have seen different wattage figures.

So did we replace the motor, slow the grinder down, or reduce its power?

Why did the GU63 go from 110 RPM to 80 RPM?

Some earlier GU63 descriptions listed a speed of 110 RPM. Following a review and remeasurement, our current published figure is 80 RPM.

This is a correction to how the specification is measured and reported, not a switch from one motor to another. Owners of earlier GU63 grinders should not interpret the two published figures as proof that their machines use different motors.

Motor speed measurements can depend on the test conditions and method, including the operating load. We are not claiming that one specific old measurement was taken unloaded and the newer one was taken under load; the published figures alone do not establish that. The confirmed point is that we remeasured and updated the stated specification without changing the motor.

For the wider question of how grinder speed affects coffee, our guide to low-speed and high-speed coffee grinders explains why RPM needs to be considered alongside burr geometry, feed rate, and load.

And what about the wattage?

Older GU63 materials have used power figures such as 96W and 100W, which understandably led to questions. Our current published motor specification is 100W DC motor. The external adapter is rated at 24V DC, 3A, or 72W continuous output.

A watt is a unit of power. But different wattage numbers may describe different things. Motor ratings, adapter output limits, and electricity actually drawn while grinding should not be treated as interchangeable.

That is why comparing 100W directly with 72W does not show a hidden motor downgrade. A motor's nominal rating is not a claim that it continuously draws that much power in every operating condition.

We explain the broader electrical distinction in Coffee Grinder Motor Power Explained: Why Wattage Alone Doesn't Tell the Full Story.

Does an older GU63 perform differently from a newer one?

Not as a result of this motor-specification update. The GU63 still uses the same motor, with its 63mm conical burr system, stepless grind adjustment, and single-dose workflow.

Actual grinding time and load can vary with bean density, roast level, dose, and grind size. That is normal for a coffee grinder and is one reason a single power or RPM number never tells the whole story.

We do not want to overstate what the revised numbers prove: they clarify our published specification. They are not, by themselves, a new controlled performance comparison of every production batch.

Why are we explaining this now?

Because if a product page changes from 110 to 80 RPM with no explanation, it is reasonable to ask whether the hardware changed. The same goes for seeing different wattage figures in old and new product information.

We should have made the revised measurement and labeling clearer. Here is the simple explanation we want customers to have: the numbers were updated; the GU63 motor was not.

The bottom line

Same GU63 motor. Revised measurement and labeling. No motor downgrade.

Technical specifications matter, but so does explaining them properly. Thanks to the customers who noticed the discrepancy and asked us to clarify it.

Need help understanding the label on your GU63? Contact service@mywirsh.com.