We don't ride Pittsburgh, but if you make your way up to the hills of Westmoreland/Somerset/Fayette Counties, we have a group of ski instructors that ride Laurel Mountain, Seven Springs, Roaring Run and Quebec Run regularly.
After work ~6PM a night or two a week at Seven Springs for short 3-4 mile rides with lots of AM technical playing or our larger 10-15+ mile rides on Sunday mornings at 8:30.
A few of our group are really into XC racing and love to ride stupid fast and climb, climb, climb...the core of our group lives for having fun on the rocks and AM type stuff and only climbs as a necessary evil. The speed range is all over the board and since we at times have 10-12 riders, frequent stops are the norm. We have everything from beginners to ex pro level racers riding with us.