VelopediaBicycle Archive · Specification report

2019 Specialized Riprock Coaster 20

Velopedia Archive ID 900004523

Overview

Model year2019
BrandSpecialized
ModelRiprock Coaster 20
Bicycle typeYouth
Archive ID900004523
Original MSRP$270.00
ColorsMonster Green/Nordic Red/Black; Rainbow Flake Pink/Deep Fuchsia/Metallic White Silver; Royal Blue/Moto Orange/White; Satin Sterling Grayl/Nordic Red/Hyper Green; Turquoise/Hyper Green/Light Turquoise

Frameset

Frame constructionSpecialized A1 Premium Aluminum
Frame materialAluminum
ForkHi-Ten, 1-1/8" steerer

Drivetrain

CranksetHi-Ten steel, 114mm; chainrings: 36T
Bottom bracketSteel, loose ball bearings
Cassette18T cog
ChainKMC Z510, single-speed, anti-drop, 1/2"x1/8"
PedalsNylon platform w/ reflectors

Brakes

Brakes(R) V-brake w/ tool-less reach adjust brake lever

Cockpit & contact points

HandlebarBMX, steel, 10-degree backsweep, 4-degree upsweep, 130mm rise, 560mm width, 22.2mm
SaddleSpecialized Kids' Henge
SeatpostSteel, 25.4mm

Wheels & tires

Hubs(F) Steel, bolt-on, 100mm spacing, loose ball bearings, 36h / (R) Coaster brake, bolt-on, loose ball bearings, 110mm spacing, 18T cog, 36h
Rims20" alloy, 16mm depth, 21mm internal width
SpokesStainless, 14g
Front tireRhythm Lite, 30 TPI, wire bead, 20x2.3"
Rear tireRhythm Lite, 30 TPI, wire bead, 20x2.3"

Geometry · 9

Effective top tube449 mm
Head tube80 mm
Head-tube angle70°
Seat-tube angle72°
Chainstay / rear center386 mm
Wheelbase858 mm
Bottom-bracket drop42 mm
Reach315 mm
Stack413 mm
Standover height477 mm
Fork offset / rake23 mm
Front center476 mm
Trail71 mm
Seatpost length220 mm
Crank length114 mm
Stem length37 mm
Handlebar width560 mm

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on November 6, 2026.