Boy's Hotrock 20 Coaster
Part No.  

Boy's Hotrock 20 Coaster

Part No.  
Chances are, your first bike had a coaster brake. They're easy to use, and honestly, you can't beat the awesome skids that you can do with them. If you're feeling overwhelmed with nostalgia right now, don't worry—Junior can get one, too, with the Boy's Hotrock 20 Coaster. It has one gear that's easy to spin and a simple-to-use coaster brake. This means that the bike is easy to ride, but just as importantly, it means less maintenance for you. We also made the bike to be plenty tough to stand up to the hard use that every kid is capable of, with a durable 20-inch A1 Premium Alloy frame that has an ultra-low standover to make getting on and off the bike a breeze. Then there's a bombproof fork that'll take curb hops in stride and a whole host of strong components. Add it up, and you get a machine that's built for pure fun with a thoughtful design that'll have you spending more time riding with your kid and less time at the repair counter. 
  • Tough, light, and durable, the A1 Premium Aluminum frame is built to stand up to years of tough riding.
  • A Hi-Ten steel fork is strong and durable, so it will withstand your little ones trying to catch air for the first time.

Technical Specifications

CHAIN KMC Z510, single-speed, anti-drop, 1/2""x1/8""
BOTTOM BRACKET Steel, loose ball bearings
CRANKSET Hi-Ten steel, OPC
FRONT HUB Steel, nutted axle, 36h
REAR HUB Steel, coaster brake, nutted axle, 36h
INNER TUBES Schrader valve
SPOKES Stainless, 14g
RIMS 20"", alloy single wall, pin joint, 32h
FRONT TIRE Specialized Rhythm Lite, 20x2.0"", 30TPI, wire bead
REAR TIRE Specialized Rhythm Lite, 20x2.0""
SADDLE Specialized Kids', 7mm rails w/clamp
SEATPOST Steel, 25.4mm
STEM Ahead, alloy, 1-1/8"" steerer, 22.2mm clamp, 37mm extension
HANDLEBARS BMX, steel, 10-degree backsweep, 4-degree upsweep, 130mm rise, 560mm width, 22.2mm
GRIPS Specialized, Kraton, closed end, 105mm
PEDALS Nylon platform w/reflectors
SEAT BINDER Alloy, 31.8mm
FORK Hi-Ten steel, 1-1/8"" threadless steerer, 3/8"" axle dropouts
FRAME Specialized A1 Premium Aluminum, 20"" singlespeed coaster, formed top tube/down tube, forged horizontal dropouts


Geometry Chart

- Geometry

Crank Length 114mm
Stem Length 37mm
Seatpost Length 220mm
Handlebar Width 560mm
Chainstay Length 386mm
Seat Tube Angle 72°
Rake 23.5mm
Head Tube Angle 70°
Head Tube Length 80mm
Top Tube Length (Actual) 438mm
Top Tube Length (Horizontal) 456mm
Seat Tube Length, Center to Top 241mm
Standover Height 505mm
Bottom Bracket Height 227mm