What is the fine-grained topic of the following text: Frame size: Captain 18", Stoker 15"; 26" Bontrager Maverick rims; Shimano tandem hubs; new Schwalbe Marathon Greenguard 26" x 1.5" tires; Shimano Deore XT 8 spd rear derailleur, 11-30 cassette; Shimano 105 front derailleur; Grip Shift SRT-800 shifters; Gore Ride-on derailleur cables, Sugino cranks Captain 175mm/Stoker 170mm; 28/42/52 tooth chainrings; Shimano LX V-brakes & levers; Ritchie SPD pedals; Rock Shox Judy XC fork; ergonomic Arc handlebars; Onza bar-ends; adjustable stoker stem; Kalloy Uno suspension seatposts; Blackburn Mtn. Only return the topic.
Bicycle specifications