LOL @ the Iron Mtn comments.
4 years ago (I'm a lot fitter now) I was planning a Crest to Canyons ride. On the way up I met a couple who didn't know where to go, so told them I'd guide them. Instead of dropping down Canyons, they wanted to ride back Southbound on MM. I felt great at Canyons. The slog back to PCMR, especially the uphill Iron Mtn segment, in 90F weather almost killed me.
The Big Guy was watching out for me, because by the time we got to Armstrong they had CLOSED MM South of there for Gondola work, and send everyone DOWN Armstrong. Legally down Armstrong LOL. But I was never more relieved in my life, the thought of climbing up Amstrong to MM to Spiro would have broke me. Never bonked so hard in my life.