Specialized Riprock Coaster 20 Features
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 aren't mutually exclusive anymore.
While there are many notable features that make the Riprock awesome, it's the 2.3-inch tires that provide a high degree of, well, 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.
At a Glance
- The A1 premium 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.
Component Specifications
| Frame | Specialized A1 Premium Aluminum |
| Seat Binder | Bolt-type, 28.6mm |
| Fork | Hi-Ten steel |
| Chain | KMC Z510, single-speed, anti-drop, 1/2"x1/8" |
| Crankset | Hi-Ten steel, 114mm |
| Chain Rings | Steel, 36T |
| Bottom Bracket | Feimin FP-B701, 68MM |
| Rims | 20" alloy, 16mm depth, 21mm internal width |
| Front Hub | Steel, bolt-on, 100mm spacing, loose ball bearings, 36h |
| Rear Hub | Coaster brake, bolt-on, loose ball bearings, 110mm spacing, 18T cog, 36h |
| Spokes | Stainless, 14g |
| Front Tire | Rhythm Lite, 30 TPI, wire bead, 20x2.3" |
| Rear Tire | Rhythm Lite, 30 TPI, wire bead, 20x2.3" |
| Inner Tubes | Standard, Schrader valve |
| Rear Brake | V-brake w/ tool-less reach adjust brake lever |
| Stem | Die Cast Aluminum, 37mm length, 10 degree, 22.2 clamp diameter |
| Handlebars | BMX, steel, 10-degree backsweep, 4-degree upsweep, 130mm rise, 560mm width, 22.2mm |
| Grips | Specialized, slip-on |
| Saddle | Specialized Kids' Henge |
| Seatpost | Steel, 25.4mm |
Specialized Riprock Coaster 20
| Bike/Frame Size | 20 |
|---|---|
| Seat Tube Length, BB Center to Top | 250 mm |
| Top Tube Length, Horizontal | 449 mm |
| Standover Height | 477 mm |
| Head Tube Length | 80 mm |
| Reach | 315 mm |
| Stack | 413 mm |
| BB Drop | 42 mm |
| Chainstay Length | 386 mm |
| Seat Tube Angle | 72° |
| Head Tube Angle | 70° |
| Fork Rake | 23 mm |
| Trail | 71 mm |
| Front Center | 476 mm |
| Wheelbase | 858 mm |
Size Guide: Specialized Riprock Coaster 20
