David Letterman rips it up (kind of literally) on the Razor MX650 on Late Night:

Specs?  Yeah, we got 'em:

  • Specifications

    • Max: 220lbs
    • Age: 16+
    • Product Weight: 98 lbs
    • Assembled Product Dimensions: 56" x 24.5" x 36"
    • 36V (three 12V) sealed lead acid rechargeable battery system
    • Battery charger included
    • Product decoration and specifications subject to change without notice
    • Some assembly required

  • Full Feature List

    • Speeds up to 17mph
    • Up to 40 minutes of continuous use
    • Steel Construction
    • Variable speed, high torque, chain driven motor
    • Twist-grip acceleration control
    • Hand operated dual disc brakes
    • Large 16" front and 14" rear pneumatic tires
    • Dual suspension and adjustable riser handlebars
    • Double crown fork
    • Retractable Kickstand
    • Authentic dirt bike frame geometry
    • Folding metal foot pegs
    • Generates more power for uphill and off-road conditions
    • Scaled down dirt bike design carries riders up to 220 lbs
    • Supercross inspired design
    • Battery charge time: 12 hours