BMX wheels: stability first
Small 20-inch BMX wheels are designed for maximum stability in all directions. Anyone who has seen BMXers in action will quickly understand why. With BMX bikes, stability is required above everything else in order to be able to take hard landings without issues. That's why compact BMX wheels often have significantly more spokes than much larger MTB wheels and often weigh more, even without a brake mount and freewheel. When buying, please note that BMX bikes and wheels traditionally have slightly different installation widths and axle diameters.