Yes there is an Inwood Cycling Club @noteon. Follow the FB link to get caught up ( http://www.facebook.com/#!/group.php?gid=141009001831) .

I myself have only recently stumbled upon them . Been on a couple of rides and it has never disappointed. We generally meet every Sunday at IRC at about 12:30, wait for any stragglers and head out. Each ride varies from the Greenway or up to Yonkers or street riding downtown. Pace can vary from ride to ride. If it's just a collective of strong riders, you can bet it's a fast pace. If the group is more relaxed, we are all relaxed. Either way no one is ever left behind.