pro 50z are the crusty demon bikes. i havent heard much bout em but youd want somethin a lil more powerful well you will eventually. i dont think there that bad of a bike yet i might be rong.
yea maybe quality but I doubt that's why they use em', crustys are serious riders with lots of sponsers so they they coulda had these litle fun bikes just dumped on them and were told to ride em'