You can put a Gyro on any bike…
To install a gyro, take out your top headset cup. Put the bottom gyro piece on, then put the cup back in. Now that you have done this, put the rest of your headset in except the top nut. Slide in the middle and then the top gyro piece on. Then put the rest of your headset together. Slide your stem and bars on and hook up your cables.

BMX Bike Gyro
If it clicks…
If your gyro clicks, straighten up the center piece by tightening and loosening the cables. This will cause each side of the gyro to have the same tension, and it will move smoothly up and down with no clicking.
perfect, i was wondering how gyros work, & why mine was clicking (the bearing seems to shift)