hi i am a begginer too, started bout week ago really, i recomend 20" cuz they are ace, n i ride one, n they are much lighter. but realli it is whatever floats you bout. have you got msn, if so, add me on geraldo43rolo@hotmail.com please, i would like to meet a begginer like me, loadsa of peeps i know that trials are like wooooow amazin. so please add me, but i recomend 20" they are ace