Like the Mini, SE Bicycles' Ripper Jr. is intended specifically for the track, and shares lightweight frame technology along with premium components. The main difference is an inch longer toptube and slacker seat tube angle so it has a roomier cockpit for taller riders. Please Note: This bicycle does not ship assembled. It's recommended that all SE Racing bikes be assembled by a qualified mechanic. Improper assembly of your SE Racing bicycle may lead to premature wear, failure of individual components, or possible personal injury. Failure to do so may also void the manufacturer warranty.