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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

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which is the bigger ? just got pedals for my son,s bike thinking all pedals the game size but these are too big so would they be 9/16 ? it,s the smaller size he would want , so what would the smaller size be so i can get them ? thanks gary – user7752 Aug 9 '13 at 15:37
up vote 7 down vote accepted

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.

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If your LBS is good enough to help you out return the favor and buy your pedals from them. – mikes Jul 3 '12 at 10:33
And if you're dead set on the model but they don't carry it, let them know that you'd much rather buy from them if they'd start carrying that brand. And make sure your next purchase comes from them. – jimirings Jul 3 '12 at 15:49

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...

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There are also 15mm spindles. Make sure that your spindles are not metric. My Diamondback Overdrive has metric spindles on my pedals. I am looking to replace them with clipless pedals.

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Welcome to Bicycles SE. While your post contains useful information, it doesn't really answer the OP's question. Please consider expanding your answer, editing this information into an existing answer, or moving this information to a comment on another answer. – jimirings Aug 27 '13 at 18:08

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