Large-size model has 24" (61cm) wheels and a caliper brake with a parking brake mechanism. Low-ration fixed gear enables riders to get going easily, allows the device to be reversed, and helps slow down speeders. Includes adjustable trunk support, adapted pedals, and an adjustable extra-wide saddle seat. Tracker measures 69"L x 30"W (175 x 76cm), and will accommodate riders up to 170 lbs. (77kg) with an inside leg length of 25" to 30" (64-76cm). Accessories sold separately. See Pelvic Strap (#39433), Leg Calipers and Foot Sandals (#39438), and In-Line Trunk Support (#39628).