text: gt bike help!!? i have a gt bike it is a vertigo but dont know what year it is... do the rims that come with the bike really matter or can i get any other rims and have the same preformance...do i need to buy parts? no you don't need the rims the bike was originally speced with you can use any 20" bmx wheel the type of rim you buy will depend on the type of riding you do......