Why Yamaha Piano Key Length Matters (B1 vs U1 vs U3 vs C1 vs C3 vs C7)

QUICK TAKEAWAY! Short keys are more difficult to control, resulting in you playing random loud and soft notes. With longer keys, you can play at a more consistent and deliberate volume. Don’t buy a piano with short keys!

When people compare Yamaha pianos, they usually focus on the sound, age, size, or price. One of the biggest differences, however, is hidden inside the keyboard. The keys!

To compare them properly, I removed keys from six Yamaha pianos:

As you can see, the U3 is a full 34% longer than a B1, creating a much smoother touch over a larger area of the key.

So why does that matter? Watch my video below and scroll down to read the rest of this article

What Longer Keys Actually Do

I used to think that longer keys had “more leverage”, but that isn’t quite true because the piano’s basic action geometry is remarkably consistent between models even with drastically different key lengths.

That’s why, if you press every key right at the front edge, a well-regulated B1, B10, U1, U3, C7, etc., can all feel surprisingly similar.

The real advantage of longer keys appears when you move away from that ideal playing position.

A More Consistent Touch

Pianists don’t always play from the front edge of the key.

Your fingers naturally move further up the key’s length towards the fallboard when playing certain chords. Sometimes you find yourself playing more than halfway up the key.

As your finger moves towards the balance pin, you have less leverage. On a short key, your leverage reduces quickly. On a long key, it reduces more slowly.

The result is that longer keys maintain a more consistent and “easy” touch even as you play higher up the keys towards the fallboard. The keyboard feels more forgiving because small changes in finger position have less effect on the key’s response.

This is the main advantage of longer piano keys, and it is something every pianist can feel.

Black Keys Benefit Too

Black keys are naturally shorter than white keys, so they feel heavier more quickly as you play further up the key. And that means the black keys on a small piano are particularly compromised when playing further up the key.

It’s Only One Part of Piano Touch

Key length is important, but it isn’t the whole story.

The overall touch of a piano is also influenced by regulation, friction, hammer weight, action geometry and many other factors. Two pianos with identical key lengths can still feel completely different if one has been prepared properly and the other hasn’t.

Likewise, fast repetition depends far more on the quality of the action and its regulation than on key length alone.

Longer keys improve consistency, but they don’t magically solve every aspect of touch.

The best pianos have longer keys

Yamaha’s best pianos have longer keys, longer strings, larger soundboards, and larger actions, to create an overall more impressive “no compromise” piano.

Yamaha’s cheapest, smallest pianos have the shortest keys, shortest strings, smallest soundboard, and smallest actions. Why? Because they have to make those design compromises to produce a piano that is small enough and cheap enough to meet the needs of buyers with limited budget and space.

Should It Affect Your Buying Decision?

Absolutely yes! If you’re considering a Yamaha B1 or B10, I would strongly recommend playing a Yamaha U1 and Yamaha U3 alongside them. Don’t just listen to the sound.

Pay very close attention to how the action feels when your fingers move further into the keys.

The difference is subtle at first, but once you notice it, it’s difficult to ignore.