I ride assos and have been doing so for many years, I am 6'3 - 250lbs and use the TIR with no issues.. On a side note the TIR label is something that is put on semi trucks in Europe denoting "Wide Load"..
If anyone is looking for a great deal on assos, a few tir sizes are left.. Over 50% off..
http://www.competitivecyclist.com/ro...1276.14.1.html
http://www.competitivecyclist.com/ro...1281.14.1.html