There are LOTS of bike stores in Philly, but these two — Keystone Bikes and Via bicycles—are my favorites. You might also want to check out Firth and Wilson Transport Cycles, even though I haven’t been there myself I’ve spoken with Simon and visit their booth at the Philly bike expo.
Keystone works my Rivs, because the mechanics “understand” Rivs and are current or former Riv owners. I bring my commuting bike to Via Bicycle, who specialize in commuter and city older used steel frames bikes. Right after I got my Platy, I rode it past Via Bicycle and Curtis said “oh, a PLATYPUS” and admired it for several minutes. I didn’t know he knew Riv!
I live three blocks from Via. If you need anything while here or if you want to go for a ride , just send me a PM. As long as your pbh is about an 83, I have a bike for you to borrow.
Roberta