I hope I'm not too late, but there is a little shop called Cycle Symphony in Adamsburg (right past Irwin). Rob Davis, the owner is a great guy and excellent mechanic. Rob built up the touring bike I used for CTC, and I've heard nothing but great things from my Westmoreland County cyclist friends. I appreciate the selection and team at Pro Bikes, but Rob's definately filled the role as neighborhood bike shop for the Monroeville/Irwin/Jeannette areas.
http://www.cyclesymphony.com/
195 Main Street Adamsburg, PA 15611
tel. (724) 374-5162