i've had mine off?.. but dont know what other wheels fit. i'm happy with my mini runner sp wheels aha
piaggio zip engine has a small back drum which can fit small drum typhoon and nrg wheels but to put one of them in front u would need different set of forks mate
Typhoon rims are 10" anyway so it's the same thing with a different look. Larger wheels on a zip completely fucks the handling so don't do it.