Single-speed bicycle on the situation, a messenger may prefer a mountain bike based single-speed, which can roll over many obstacles, or a fast and light road bike-based single-speed. In the United States market, bicycle companies such as Bianchi, Cannondale, Fuji Bike, KHS, Kona, Raleigh, Giant, Specialized, Swobo, Felt, Trek and Niner all have produced and marketed single speed bicycles. Because most full suspension frame designs either have a single pivot that is not concentric with the bottom bracket, or a linkage with a variable center of rotation, the distance between the bottom bracket and rear axle varies throughout the suspension's travel. This
Star Trek VI: The Undiscovered Country Spock and Scott inspect the torpedoes. Some shots were reordered or replaced, with wide-angle shots replacing close angles and vice versa. The special features included a commentary track with Meyer and Flinn, featurettes detailing the special effects, production, and historical inspiration of the film, and a tribute to actor DeForest Kelley. The film's original theatrical cut was released on Blu-ray Disc in May 2009 to coincide with the new "Star Trek" feature, along with the other five films featuring the original crew in "Star Trek: Original Motion Picture Collection". "The Undiscovered Country" was remastered in 1080p high-definition from the 2000