Overhaul time: Why is My Bike Soooo Sloooow?

My bike in the spring with the sludgy Hebie Chainglider still installed. I’m very happy to have a real, silent, frictionless Dutch chain case on my bike again. Still, I couldn’t believe that either the Chainglider or the filthy (but almost new) chain were really causing so much friction. Spinning the crank backwards the [...]