Dirt is always good.
Yes, as is exploring. I wanted to follow Edgewood down, crossing the connection I'd recalled from Google Maps on PipelineTrail. But I was in the wrong spot and ended up on Gravity Car trail instead. That was surprisingly smooth, no issue on the road bike. It connects with Old Railroad near the double-bowknot, which I knew from MTB, then connects onto Fern Canyon. @ Summit junction, I asked some MTBers, and was told I could follow Summit down, but decided to stick to ORG instead. The lower portion is rocky and hard on the hands, but not a problem otherwise.