Riprock 20 Coaster
Part No.  

Riprock 20 Coaster

Part No.  129003
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Traction, control, confidence, and fun—the Riprock 20 Coaster is the perfect bike for your kid to start hitting the trails with. And with the simple coaster brake design, safety and fun are no longer mutually exclusive.

While there are many notable features that make the Riprock awesome, it's the 2.3-inch tires that provide the high degree of shred-ability—delivering exceptional traction, control, and confidence for riding rough, off-road sections and city streets alike. And when you combine the big tires with sturdy 20-inch wheels, an easy-to-use coaster brake that all but eliminates the threat of the dreaded endo, and a single-speed setup, you have the perfect mountain bike to get your little Ripper out on the trail.

  • The premium A1 aluminum frame is lightweight and built to withstand the tough use by kids, while the geometry features an ultra-low standover that makes it easy for your little ones to fit on and grow with the bike.
  • Steel coaster brake is a reliable, easy to use brake perfect for safe stops and awesome skids.
  • 20x2.3" Rhythm Lite tires deliver tons of traction, comfort, stability, and fun over all types of terrain. 

Technical Specifications

FRAMESET
SEAT BINDER Bolt type, alloy, 28.6mm
FORK Hi-Ten, 1-1/8"" steerer
FRAME Specialized A1 Premium Aluminum
WHEELS
FRONT HUB Steel, bolt-on, 100mm spacing, loose ball bearings, 36h
REAR HUB Rear coaster brake, bolt on, 110mm spacing, loose ball bearings, 18T cog, 36h
INNER TUBES Schrader valve
SPOKES Stainless, 14g
FRONT TIRE Rhythm Lite, 20x2.3"", 30 TPI, wire bead
RIMS 20"", alloy single wall, 36H
REAR TIRE Rhythm Lite, 20x2.3"", 30 TPI, wire bead
DRIVETRAIN
BOTTOM BRACKET Steel, loose ball bearings
CHAIN KMC Z510, single-speed, anti-drop, 1/2""x1/8""
CRANKSET Hi-Ten steel, OPC, 114mm
CHAINRINGS 36T
COCKPIT
SADDLE Specialized Kids
SEATPOST Steel, 25.4mm
GRIPS Specialized, slip-on
HANDLEBARS BMX, steel, 10-degree backsweep, 4-degree upsweep, 130mm rise, 560mm width, 22.2mm
STEM Alloy, 10-degree rise, 22.2mm clamp, 37mm
BRAKES
REAR BRAKE V-brake, alloy, linear pull, tool-less reach adjust brake lever
ACCESSORIES
PEDALS Nylon platform w/ reflectors

Geometry

Geometry Chart

- Geometry

 
Crank Length 114mm
Stem Length 37mm
Seatpost Length 220mm
Handlebar Width 560mm
Top Tube Length, Horizontal 449mm
Reach 315mm
Wheelbase 858mm
Stack 413mm
Chainstay Length 386mm
Front Center 476mm
BB Drop 42mm
Seat Tube Angle 72°
Head Tube Angle 70°
Head Tube Length 80mm
Seat Tube Length, BB Center to Top 250mm
Fork Rake 23mm
Trail 71mm
Standover Height 477mm

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