Will 20 inch BMX wheels fit a folding bike (with 20 inch wheels)? I'm renovating a folding bike with 20 inch wheels and want to replace the wheels.

Will BMX wheels fit ? 



EDIT 22-Feb-2020: 10mm BMX wheels dropped straight in with no mods.

The BMX freewheel was threaded on, I just screwed it off and screwed on the shimano six-speed cluster from my old bike.  It needed extra spacers on both sides of the rear axle beyond what came with the BMX wheels: I used the ones from my old wheels so I didn't have far to look.

The only thing that shows that they are not made-to-fit is, on the front wheel, the ends of the axles stick out half an inch or so beyond the wheel nuts. I suppose I will cut them off in time.



I get it that I will probably have to go single-speed and therefore also replace the crank and chain. Is there any other reason they are not compatible, like different dropouts or axle width... I also know that a 2-inch BMX tire will fit in this frame, I fitted one once.
Thanks, guys, like you say &quot;it depends&quot;. But those pointers allowed we to find the answer for my own case which is:
&quot;Yes, if I get 3/8 inch BMX axles and bend (cold set) the rear frame or add spacers.&quot;
Axle Diameter
Cheap store-bought bikes like mine have 3/8&quot; or sometimes 10mm axles, which are practically the same. BMX ones are either 3/8&quot;, or are 14mm, which is a good bit larger.
It's not quite game-over for the 14mm BMX axles though because some have flats on them so they fit 3/8 dropouts as well. If the axles are solid you can file the flats yourself - but a lot are not.
Opinion was pretty unanimous - do NOT file-out the dropouts to take he larger axle.
Front Wheel
The width of the road and the BMX axles are both generally 100mm so the 3/8&quot; BMX front wheel often drops straight in.
Rear Wheel
The rear axle is significantly wider on a road bike - 130mm on the road vs 110mm on a BMX. The BMX axles might be over-length enough to fit if you put in a 10mm spacer each side. Or you can bend-in the rear frame if it is steel to take the narrower axle (cold setting).
Just want to reinforce that the full answer is indeed &quot;it depends&quot;, and this answer is specific to for cheap store-bought bikes with steel frames.