What size crank arm should I use MTB?

What size MTB cranks do I need?

Stock cranks, usually coming at 175 or 170mm, work just fine for most people, but there are benefits to longer or shorter crank lengths depending on a riders physiology and riding style.

How do you know what size crank arm to get?

Crank length is measured from the centre of the bottom bracket axle to the centre of the pedal axle. If you’re not sure what length the cranks on your bike are, the quickest way of finding out is typically to just look at the backside of your cranks, just below the pedal axle.

What’s the difference between 170mm and 175mm cranks?

Whereas now 170 is ‘short’ 172.5mm is ‘normal’ and 175 mm cranks are very common. Still though, the difference between 170 mm and 175mm is less than 3% and leg lengths of bike riders vary by far more than that.

Does MTB crank length matter?

That means shorter cranks give riders better acceleration, which can make a difference when passing other riders or trying to clean an obstacle. Shorter cranks can also have health benefits for riders.

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Are longer crank arms better for climbing?

Longer cranks give more leverage and the ability to pedal a bigger gear given everything else being equal. … Same applies to cranks on a bicycle. This becomes especially useful in hill climbing, when we are pushing slower revolutions and of course more difficult to push a gear climbing.

Will shorter cranks help my knees?

Crank length can be used as a tool to improve fit related issues impacting comfort, power, and aerodynamics. Moving to a shorter crank can improve: Comfort: A shorter crank length reduces range of motion at the knee (extension and flexion), hips, and low back.

How do you tell if a cranks will fit my bike?

2 Answers

  1. Measure the length of the Bottom Bracket shell. …
  2. Count how many chainrings you have. …
  3. Count the teeth on the chainrings, or look for markings that may indicate the number of teeth (e.g.. …
  4. Count how many cogs you have at the rear. …
  5. Length of crank arm is less important for me.

What is the difference between 172.5 and 175 cranks?

From 172.5mm to 175mm, you have only 2.5mm difference. We set our saddle height when the pedal is at 6 o’clock position. So you should lower the saddle for 2.5mm, since your pedal is 2.5mm lower than it was.

Why do MTB have longer cranks?

Back in the day it was thought that longer cranks were better, because they increased the pedalling leverage, thus enabling you to create more power. However, several studies have shown that even dramatic crank length differences have only a small effect on how much power you can produce.

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