After posting last night I kept studying and googling and I found a rack from Topeak called the explorer. It was an editors pick out of all the racks they tested or reviewed. I liked the fact that it had 2 flat bars at the top instead of solid aluminum arms. I got the disc specific rack that is supposed to fit 26, 27.5, and 700c rear wheels. My bike is a 650b running 2.4 tires. I hope it all clears but this rack gets almost 5 stars on many reviews. Thanks for taking the time to respond.