This is a Mongoose 21 SPEED Mountain Bike. 26" wheel, 18" frame. It comes with a great little air pump (attached to the right side of the bike) and it does have a bike lock but it's been so long, the combination has been forgotten (my apologies!).The bike is in really great shape, being that it's rarely been used. I'm selling it because I don't have use for it, but I'm sure there is someone who does.