GG Quadster is a motorized four-wheeler, or quadricycle, consisting of a BMW K1200S motorcycle with a reworked suspension and steering, and additional wheels. It has been made by Swiss manufacturer Grüter + Gut Motorradtechnik GmbH (GG) (aka Gruter und Gut) since 2008. The BMW inline-four engine produces 167 horsepower. In Germany it can be licensed as a four-wheel motor-bike, while in California it was not approved by regulators.