Universal Parts Shock for Pocket Bikes, Stand-Up Scooters, Super Pocket Bikes, some Mini-Choppers an d other small vehicles. Specific to the compatible with Razor brand MX500 and MX650 Electric Dirt Bikes, Versio ns 1 and up and the compatible with Razor Dirt Quad, Versions 1 and up. Overall Length: 171mm (6.7 inches) Mo Universal Parts Shock for Pocket Bikes, Stand-Up Scooters, Super Pocket Bikes, some Mini-Choppers and other small vehicles. Specific to the compatible with Razor brand MX500 and MX650 Electric Dirt Bikes, Versions 1 and up and the compatible with Razor Dirt Quad, Versions 1 and up. Overall Length: 171mm (6.7 inches) Mounting Distance: 151mm (5.9 inches) Mounting Hole Diameter: 8mm Suspension: 650 lb./in. Coil Diameter: 7mm No Internal Dampening