(1) By the entrance to VDNKh. Cheap Chinese but good enough for bike rental, which is the main product of this establishment.
(2) In the Sokolniki bicycle market, about the middle of the long corridor to your left if you enter through the main entrance closer to Metro Sokolniki. Consultants appear knowledgeable but the market as a whole has a questionable reputation, and things bought there may disintegrate instantly, as it happened with my last purchase there, pant clips.
(3) Ecobike, Pokrovka 41, stroyeniye 2, office 6, eco-bicycle.ru. No further info or personal experience.
ADVICE ON THE MOSCOW BIKE SCENE, ASSISTANCE WITH PURCHASE OR REPAIR, OR WHATEVER ELSE I CAN DO TO ENCOURAGE THE USE OF VEHICLES THAT DON’T STINK AND MAKE NOISE IS FREELY AVAILABLE. WRITE TO PAUL_VOYTINSKY@YAHOO.COM