Nice to hear some local knowledge. Manayunk is pretty steep for sure, I’ve been doing it with my big ring only bit I think you’ve hit on the main problem: After about an hour of hills at 60rpm my legs can get pretty shot. Endurance rides have to pretty much avoid hills for me to keep the watts low enough.
But like another poster said, lack of availability of parts means I have plenty of time to bounce this around in my brain 
South Jersey hills are called bridges I think.
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