Thanks for the info guys, I already got a new wheelset, cassette and all, and i will remember to block off the 13T if i have to. Do you guys know if you have to adjust your rear derailleur if you have 2 different cassette ranges (13-26 & 11-25). I'm fine with the 11 being blocked off, or can you guys just tell me real quick how to change the range of the derailleur (either a youtube video or just talk it out). Sorry for the trouble guys, but it helps out alot.