I bought a 2014 Trek 7.3 today and the guy said it has a replacement rear wheel. This Trek is supposed to be a 9 speed cassette but they replaced it with a SRAM 8 speed on a hub of unknown origin. The rim is an Alexrims DA22, which Im reading is a low cost wheel. My question is, will a 9 speed cassette fit on this hub or should I track down the stock Bontrager Nebula wheel with Shimano RM30 hub that originally came on this bike? Any insight would be welcome(: