Myth 1: Longer Cranks Equal More Power?

Finding a crank length that feels right is key—but that also means letting go of some old myths that just don't hold up. Let's start with one of the biggest. 

When we talk about "short cranks," we're typically referring to crank lengths shorter than 170mm, and even more so those in the 150-165mm range, as opposed to the more common 170-175mm. 

So, regarding how crank length affects power, have you ever heard that "longer cranks automatically make you more powerful"? It sounds logical, as longer levers generate more torque in physics. 

However, once human bodies are brought into the equation, things become much more complicated. In fact, how does crank length affect power? While longer cranks can indeed boost torque, they simultaneously slow down your natural cadence, which is the number of pedal revolutions you can comfortably maintain. 

In cycling, power isn't just about brute force; it's torque times cadence. So, do you lose power with shorter cranks? Generally speaking, if longer cranks allow you to push harder but spin slower, the resulting power output often evens out, and you won't magically generate more watts. 

 

So, do longer cranks make you faster? Or are longer cranks better for climbing? 

Not necessarily.

Your body adapts to find its optimal power balance, so simply going longer doesn't automatically equate to more speed or better climbing.

 

Myth 2: Shorter Cranks Are Only for Racers?

Another common misconception is that shorter cranks are only for racers. In reality, many cyclists care more about whether shorter cranks are better—or worse—for their knees.

Short cranks aren’t just for racers; they can be an excellent choice for certain riders. 

Because they reduce the range of motion your hips, knees, and ankles must travel during each pedal stroke, shorter cranks often feel more natural and place less stress on the joints—especially for cyclists with knee pain, tight hips, or limited flexibility.

That’s why many bike fitters now recommend experimenting with slightly shorter cranks when comfort is an issue, not just when you’re chasing marginal performance gains.

If you're interested in short cranks, we've written an in-depth article about them. 
Feel free to check it out to better understand your own needs.

Myth 3: One Perfect Crank Length for Everyone?

Does 2.5 mm crank length make a difference? In reality, studies by cycling physiologists, like Jim Martin, Ph.D., have shown that riders naturally adjust. Even if given a 165mm crank or a 180mm crank, after a period of adaptation, their sustainable power output remains largely the same. Within reason (we’re talking 5–10mm differences), your body finds a way to make it work. 

Of course, it's not one-size-fits-all. 

If you’re a sprinter, you might lean toward slightly longer cranks to squeeze out more torque in short bursts. If you’re a time trialist or a triathlete, you might prefer shorter cranks that let you spin faster and stay lower in an aerodynamic position without smashing your knees into your chest. 

 

The Big Takeaway

Choosing the right crank length isn’t about chasing theoretical torque advantages. It’s about finding a setup that matches your body’s natural rhythm and what feels sustainable when you’re actually out there riding. 

We at Croder encourage riders to experiment and discover the length that best aligns with their body's natural movement and provides the most comfortable and sustainable riding experience.

Because in the real world, comfort and efficiency almost always beat textbook physics.