I tried a 2.6 Nobby Nic in the back of my 2-17 T130C RS and while it fitted it buzzed on the chainstay a little under hard cornering. Running higher pressure helped but kind of defeats the point. A “2.6” Maxxis should be better, as they always come up under sized. Running a 2.35 Maxxis Forekaster at the minute and there is acres of space.
Reliability wise, mine has (touch wood) been pretty much spot on. The shock developed an issues after it was serviced (wouldn’t hold air) so was replaced with a Monarch Plus, and the Guide RS brakes had the dreaded stuck lever syndrome after about 18 months, but otherwise it has been pretty much spot. Bearings are still in good shape and now I’ve got it just how I want it, it’s about perfect 🙂