The Alpha One is the smallest pedal bike in the Prevelo lineup and is the perfect starting point for the youngest cyclists—easy to learn on and the ideal first bike, with short cranks that fit little legs perfectly and a THRU-TUBE frame design that offers class-leading low saddle height. It's packed with features to get little riders off to the right start, including: Prevelo confidence inspiring low and narrow geometry. Prevelo geometry keeps the rider low, balanced and in control. Lightweight 6061 aluminum frame with custom formed tubing. Lightweight aluminum alloy fork with alloy steerer. Front and rear v-brakes with small reach brake levers. Rear coaster brake (removable with optional freewheel kit). Front hub with low profile rounded hex bolts and no harsh edged nuts for little legs to knock against. Three piece crank with squared taper cartridge bearing bottom bracket and ultra narrow Q factor. Custom made cranks. All Prevelo cranks are sized specifically for each model bike, down to the millimeter. 95% assembled. Just install the handlebar, seatpost and pedals. Weight 13.2 lbs Minimum Saddle Height 14.5 in / 370 mm Maximum Saddle Height 19.7 in / 500 mm Gain Ratio 3.7 Recommended Inseam 14" to 17½" Wheel Diameter 14 in Wheelbase 26.3 in / 667 mm Chain Stay Length 10.7 in / 271 mm Head Angle 69° Effective Top Tube Length 13.7 in / 349 mm Bottom Bracket Height 6.7 in / 170mm Stack 13.1 in / 332 mm Bottom Bracket Drop 0.2 in / 5 mm Frame THRU-TUBE™ Lightweight Butted 6061 Aluminum. Low Center of Gravity, Kid Specific Geometry. Internally routed Cables. Forged Dropouts. Fork Bladed Aluminum Legs with 1⅛" Aluminum Steer tube Seat Clamp Prevelo TallClamp with Toolless Adjustment Brakes Forged Aluminum V-Brakes with Kid Sized Brake Levers Freewheel / Cassette 14t cog Crank Lightweight Aluminum 3 piece. Narrow Width, 85mm length, 138mm Q factor Chainring 25t Bottom Bracket 68x113 Square Taper with Sealed Cartridge Bearings Headset 1⅛" Internal Threadless Rims Lightweight Aluminum with Shaved Sidewalls Front Hub 16h Forged CNC with Rounded Hex Key Bolts Rear Hub 16h Coaster Brake (Optional Freewheel with Rounded Allen Key Bolts) Tires Kenda Small Block Eight 14 x 1.5 Saddle HEIR Frame Hugger™ Little Kid - Alloy Reinforced Handlebar Lightweight Aluminum 25.4mm to 19mm Taper, 460mm wide, 50mm rise, 19mm grip diameter Stem HEIR Lightweight Aluminum 25.4mm Bar Bore, 30mm Extension Grips 90mm Black Rubber, 19mm Small Hand Pedals Composite Little Kid, 9/16 Crmo Spindle Version MK II