Hotrock 20 Coaster Boys
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Hotrock 20 Coaster Boys

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Hotrock 20 Coaster Boys
Technical Specifications
The Hotrock 20 Coaster is designed to be fun, safe, and reliable, with kid friendly features like dependable brakes and low standover height.
  • 20" A1 Premium Aluminum coaster-style frame with integrated kickstand has a low center of gravity for stability
  • Lightweight 36-spoke alloy rims are durable and provide a stable platform for learning
  • Specialized Rhythm Lite Sport tires will take a kid from the driveway to the dirt confidently
  • Lightweight alloy Ahead stem for perfect positioning and easy, Allen-wrench adjustments
  • Coaster brakes and hand brakes help young riders get used to stopping like the big kids

Technical Specifications

CHAIN KMC Z-410, 1/2"" x 1/8""
BOTTOM BRACKET Heat treated Hi-Ten cups, loose ball for 1pc.
CRANKSET Heat-treated Hi-Ten, 1pc.
CHAINRINGS 36T, disc-type
FRONT HUB Steel, nutted axle, 36h
REAR HUB Steel, coaster brake, nutted axle, 36h
INNER TUBES Schrader valve
SPOKES UCP 14g , w/ brass nipple
RIMS Alloy pinned, 36h
FRONT TIRE Specialized Rhythm Lite Sport, 30 TPI, wire bead, 20x2.0""
REAR TIRE Specialized Rhythm Lite Sport, 30 TPI, wire bead, 20x2.0""
SADDLE Specialized Kids, 7mm rail w/ clamp
SEATPOST Steel, 25.4mm
STEM Alloy Ahead
GRIPS Specialized Kraton
BRAKE Coaster w/ linear pull
PEDALS Composite platform w/ reflectors, loose ball, 9/16""
HEADSET 1-1/8"" threadless, loose ball
SEAT BINDER 32.2mm, alloy, single bolt
FORK 1-1/8"" threadless Hi-Ten steerer w/ 1-1/8"" blades
FRAME Specialized A1 Premium Aluminum, 20"" frame w/ low standover TT design, integrated kickstand, horizontal dropouts


Geometry Chart

Hotrock - Geometry

12 16 20
  12 16 20
Top Tube Length (Actual) 301mm 378mm 439mm
Top Tube Length (Horizontal) 305mm 385mm 439mm
Seat Tube Length, Center to Top 179mm 210mm 241mm
Standover Height 338mm 412mm 482mm
Chainstay Length 271mm 310mm 389mm
Bottom Bracket Height 165mm 198mm 227mm
Seat Tube Angle 76° 74° 76°
Rake 24mm 24mm 23.5mm
Head Tube Angle 70° 70° 70°
Head Tube Length 70mm 80mm 80mm