I am an avid mountain biker and bought a used Specialized Stump Jumper FSR. It has Mavic Crossland UST rims, however the tires have tubes in them. The rims are taped inside as well. Right now the tires being used are WTB Enduro Raptor 47/54 and 47/52 tires. I want to replace the tires to get a different tread. My question is (1) Is ok to use tubes and standard tires on tubeless rims. Also, I have never had tires that run with a 26 x 47/54 or 47/52 size. (2) Is this different than your standard 26 x 2.1 size, or 26 x 1.95 size? Or can I use standard tubes in this type of tire?