well i think that the best manuf. is DK, FIT, Kink, WTP, and diamond back......diamond backs are pretty good, mongoose are good but they get a bad rep from walmart and other stores like that, red line i am not to familiar with the same with next....Like i said before mongoose are good bikes if u by the good ones from a bike shop.....not to many bike shops have them because of their bad rep from walmart.....So watever u do DO NOT buy a bike from Walmart, meijer, etc....they are not well built and weigh alot...I hope this helps