Mongoose Grid 90 BMX Freestyle Bike, 20-Inch Wheels, Single Speed, SilverShow off your skills with Grid 90 by Mongoose. The Grid 90 features a durable steel BMX freestyle frame that's perfect for the bike park or just riding around the neighborhood. The single-speed drivetrain is easy to use and simple to maintain. This bike includes 4 freestyle pegs and a brake cable rotor that allows for awesome 360-degree bar spins. Take on the challenge with Grid 90.