I did the Devil's week rides in Port Elgin, Ontario; completing an SR series in a week.
Earlier in the season I rode a 200, 300, and a 400, so it looks like I need to schedule an additional 600
to complete a double...a first for me.
So far, I've done all my rides this year on my fixed gear bike (46/16), and unless my body tells me otherwise, I'll do the next two fixed too...the afore mentioned 600 and the 1200k Granite Anvil.