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You measure it. A ruler and a caliper are useful.

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Q: How do you find out your bmx crank size?
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Related questions

Would a three piece crank for a mountain bike work for a BMX?

yes... if you have the right bottom bracket... it has to fit the cranks as in 19 20 21 or 22mm most likely......... and it has to be the right size for the frame.. if its bmx it will probably be US size or euro, spanish or standard. if you find the right bottom bracket with the right size bearings then yes..


What is a BMX crank?

A crank (or a crankset) is the thing that sits in the middle of the bicycle, has the chain on it and have the pedals attached to it.


Will any crank fit on any bmx?

No, only the one that was made for it.


Can you fit a 3 piece crank on a bmx which had a i piece crank?

Yes you can, but take it to a bike shop or someone who knows what they are doing


How many parts are one a Bmx bike?

It depends if you have a 3 piece crank, spokes, brakes.


What shop can you find a bmx bike?

you can find a BMX bike in halfords


What is the smallest amount of teethe you can have on a pro bmx crank?

By crank do you mean sproket? The smallest iv seen is a 22t but there may be smaller, or do you mean 3pc cranks?


What bmx is suitable for 16 year olds?

Bmx's don't come in sizes. They are all one size.


What size bars does a pro bmx bike usually use?

what ever size fits them for their intended uses.


I am 5'9 what size BMX do i need?

BMX bikes pretty much all have 20"wheels, which makes all frames very similar in size. On top of that BMX is almost entirely ridden standing up, so bike size doesn't matter as much as it does for road riding for instance. I agree, but get at least a 20.5" frame.


How many spindles on a bmx?

The only thing on a BMX regularly called a spindle would be the crank axle. Although I suppose one could use spindle for the pedals and the wheel axles as well.


Does a small crank make a bmx bike fast?

Usually not. It'll be fast at the start, but a small crank will limit top speed unless you can turn the pedals really fast.