Plus, the 3-piece crank makes for a reliable power train, while alloy rims offer lightweight durability. New adventures are just a pedal away, get there with the Excursion. By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy. Indulge your sense of adventure and take on new trails with the Excursion by Mongoose. Easily adapt to your terrain with the 21-speed rear derailleur and twist shifters for precise gear changes. The front disc and rear V-brake allow you to make fast, controlled stops.