Would love to join you Philip but am in terrible form ATM, no hidden codes there btw and have a couple of tests to make. Have a good ride and hope to ride with you soon. Almost summer holidays for me so am hoping to make a comeback in July.
Wouldn't mind joining. How about heading out via Otarumi or even Wada to add to the fun?
What time are you planning to leave Setagaya-ku? Any suggestions for a meeting point? I'm coming from around Setagaya-Daita, always heading to the river on Setagaya-dori, then by the north-side of Komae station to join the river just where the last gravel stretch ends. E.g.: http://www.mapmyride.com/route/jp/kanto/596124593973186663