What's difference between 1/2 and 9/16 inch pedals?

Question

I've this bike MTB hardtail Marin Bolinas Ridge 2012.

And it has generic composite pedals which I want to change.

So while choosing pedals I saw two different choices, 1/2 and 9/16 inch pedals.

I didn't understand what does this sizes mean and apply to what.

Please if someone can explain it to me.

For example: Diamondback Sound Pedal 9/16 and 1/2 model

Sam Meldrum · Answer

The measurement is for the diameter of the pedal spindles, where they thread into the cranks. You need to find out whether your existing pedals' axle is 9/16" or 1/2". If there is no measurement indication on your existing pedals or the paperwork which came with your bike, ask your LBS if they could test out with some existing pedals to find out what size you need.

Answered by Sam Meldrum on February 7, 2021

dotjoe · Answer

1/2" pedals are for cheapo one-piece cranks, while 9/16" pedals are for 2 or 3 piece cranks. You probably need 9/16th...

Mary · Answer

I had the same question. I know the basics of a bike (experience earned repairing my bike along the years)Today I need to replace pedals and when asking for the measure of 9/16 and 1/2 question, the answers are not clear: number of cranks (?) or sending you to ask to the bike shop (?).
A seller gave this information on the web:
Standards 9/16 inches (14 mm) and 1/2 inches (12.7 mm) Diameter spindles threat
So I took my bike pedal and measured: 12.7 !! so it must be 1/2 inch.
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What's difference between 1/2 and 9/16 inch pedals?

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