I bought a 19" Rig and LOVE the bike, but my back hurts after awhile of riding and I feel pretty stretched out on the bike. I had a Trek 69er last and didn't have this problem. How would I go about getting the right size? It looks pretty long but not sure on the size thats on it, I believe they all come with the same one? I bought the bike from a trek employee so it had very little miles on it. Any suggestions as to brand / size would be great as well.
Also thinking about going tubeless, is it worth the hassle? I am learning rythem jumps at Rays MTB in Milwaukee on the bike and keep getting pinch flats and figured maybe the tubeless would help?