Specialized “Hotrock 24” Junior MTB for Sale. Nice 12-inch aluminum frame with 24 x 2.25 tires and front shock absorbers. Used, but in good condition. Below are some of the specifications… • Frame: Specialized A1 Premium Aluminum • Frame size: 12-inches • Standover height: 23-inches • Forks: SR Suntour XCT • Headset: 1-1/8" threadless • Seat binder: Alloy collar w/ QR • Rims: X-Rims alloy 32h • Front hub: Forged alloy, 32h with 3/8"" axle, • Rear hub: Forged alloy, 32h, nutted • Spokes: 2mm 14g stainless • Tires: Specialized Roller, 24 x 2.125" • Inner tubes: Schraeder valve • Chain: KMC Z-50, 1/2"" x 3/32"" • Crankset: Sugino 7-speed, forged alloy arms, • Chain guide: Bottom • Chainring: 36t • Derailleur: Shimano Tourney c/w directional pulley • Bottom bracket: VP, water sealed, 68mm x 128mm • Stem: Alloy A-Head, melt forged, 60mm, 15 degree rise • Handlebars: 600mm wide, 40mm rise, 10 degree back sweep, 6 degree up • Grips: Kraton, Revo type • Saddle: Specialized 1pc., 7mm rail w/ clamp • Seatpost: Alloy, 27.2mm, microadjust • Brakeset: Tektro alloy V-brakes • Pedals: Composite platform, 9/16"