Bike Crank Length Calculator

Understanding Bicycle Crank Length

The Crank Length Calculator helps cyclists determine an appropriate starting point for their ideal crank length. Here's an explanation of how it works and what the results mean:

What is Crank Length?

Crank length refers to the distance from the center of the pedal spindle to the center of the bottom bracket axle. It affects your pedaling efficiency, comfort, and power output.

Key Concepts

• 1

  Inseam Length

  The distance from your crotch to the ground, used as a basis for crank length calculation.

• 2

  Riding Style

  Different disciplines (road, mountain, track) may benefit from slightly different crank lengths.

• 3

  Standard Sizes

  Crank lengths typically come in 2.5mm increments, ranging from 162.5mm to 180mm.

Calculation Process

• 1

  Base Calculation

  Start with a base crank length of 170mm and a standard inseam of 83cm.

• 2

  Adjust for Inseam

  Add or subtract 0.5mm for each centimeter difference from the standard inseam.

• 3

  Find Nearest Standard Size

  Round the calculated length to the nearest available standard crank size.

Understanding the Results

• 1

  Recommended Crank Length

  The suggested crank length based on your inseam, rounded to the nearest standard size.

• 2

  Available Sizes

  Standard sizes considered: 162.5mm, 165mm, 167.5mm, 170mm, 172.5mm, 175mm, 177.5mm, and 180mm.

Interpreting the Results

• 1

  Shorter Cranks

  May offer higher cadence and better aerodynamics, suitable for time trials or criteriums.

• 2

  Longer Cranks

  Can provide more leverage, potentially beneficial for climbing or off-road riding.

• 3

  Personal Preference

  Comfort and efficiency can vary between individuals, even with similar body measurements.