Specialized Riprock 20 bicycle
The Specialized Riprock 20 is the perfect bike for young riders ready to discover the freedom of the trail. Designed to offer safety, comfort, and fun, this mountain bike is built with high-quality components and modern geometry to perfectly fit the needs of the most adventurous kids.
With a lightweight A1 Premium alloy frame, hydraulic disc brakes, Ground Control tires, and a wide-range 8-speed drivetrain, the Riprock 20 allows young riders to confidently tackle climbs, descents, and off-road trails — always with total control and comfort.
Comfort and control tailored for the youngest
The Riprock 20 design is based on data collected on children's ergonomics to offer a natural and stable riding position.
The Bridge Kids 130 mm saddle, the reduced Q factor, and the short crank arms improve alignment between hips, knees, and ankles, reducing the risk of fatigue or injury.
The narrower grips and the updated frame geometry make the bike even more maneuverable and easy to control.
True mountain bike performance
Inspired by Specialized's MTB experience, the Riprock 20 offers everything needed for safe fun:
Lightweight and durable aluminum frame
Modern geometry with relaxed head angle for greater stability
Integrated cables for a clean look and less maintenance
Promax DSK-926 hydraulic disc brakes for precise and powerful braking
Ground Control tires that ensure grip and traction on any terrain
Technical specifications
Frame and fork
Frame: A1 Premium Butted Alloy, unisex, internal cable routing, 148 mm thru-axle, compatible with 30.9 mm dropper post, replaceable derailleur hanger
Seat clamp: Bolt type, 34.9 mm
Fork: A1 Premium Butted Alloy, alloy steerer tube, 15x110 mm, with mini fender
Brakes
Front brake: Promax DSK-926, hydraulic disc brake, lever reach adjustment
Rear brake: Promax DSK-926, hydraulic disc brake, 160 mm rotor, lever reach adjustment
Drivetrain
Shift levers: microSHIFT Acolyte Quick Trigger SL-M6285-R, 8 speed, short levers for ease of use
Rear derailleur: microSHIFT Super Short RD-M5185S, 8 speed, with clutch
Cassette: microSHIFT Acolyte CS-H084, 12-42T, 8 speed
Chain: KMC X8 with Missing Link™
Crankset: Forged alloy, 115 mm length, reduced Q-factor, with chain guard
Chainring: 40T
Bottom bracket: Square taper, 68 mm
Wheels and tires
Rims: Alloy, 16 mm depth, 25 mm internal width, 28 holes
Front hub: Alloy, 6 bolts, 28 holes, 15x110 Boost
Rear hub: Alloy, 6 bolts, 28 holes, 12x148 Boost, 11-speed compatible
Spokes: 14g stainless steel
Front and rear tires: Kicker Wirebead 20x2.1
Inner tube: Standard, Schrader valve
Cockpit components
Stem: Stout 3D forged alloy, 31.8 mm, 6° angle
Handlebar: Double thickness alloy, 40 mm rise, 11° back sweep, 2.5° up sweep, 620 mm width
Grips: Specialized Trail lock-on
Saddle: Bridge Kids 130 mm
Seatpost: Specialized 6061 alloy, 2-bolt clamp, 0 mm setback, 30.9 mm diameter
Accessories
Weight
Ideal for
Young cyclists who want to venture onto the trails
Children looking for a lightweight and stable mountain bike
Parents who want a safe, durable, and high-performing bike
Note Well
Technical specifications may change without notice depending on component availability.
Product images are purely indicative and may not exactly reflect the described features.
Specialized Riprock 20 – the mountain bike that turns every pedal stroke into pure adventure.
Do you want to receive your bike ready for use? Don't forget to add the bike assembly service at the time of purchase! Discover all the details here: Francesconi bike assembly
A Complete Guide to Bike Sizes
Foreword: Not all bike sizes are the same
Each type of bike has a specific frame and often uses a different size scale. For example, a road bike with a 54cm frame might be considered a medium size by one brand, but a large by another.
Bicycle adjustment margins
Some types of bikes, like gravel bikes, offer a wide range of adjustments, adapting to different body types. Other models, however, have limitations in this regard. This is an important aspect to consider.
How to use size charts
We've created a simple guide to help you find the right bike size:
- Check out our size charts for each bike type.
- Learn more with specific tips to help you make the right choice.
Size Charts: Find Your Perfect Bike
Gravel and road bikes
Sizes are based on the length of the top tube (in cm), which determines the reach of the bike.
| Cut
|
Recommended height
|
Horizontal tube length
|
| XS |
Up to 157 cm |
48-50 cm |
| S |
157-167 cm |
50-53 cm |
| M |
168-178 cm |
53-56 cm |
| THE |
178-185 cm |
56-58 cm |
| XL |
Over 185cm |
58-62 cm |
For gravel, measurements may vary slightly due to different geometries, but remain similar.
Mountain bike
MTBs are measured in inches, based on the seat tube.
| Cut
|
Recommended height
|
Size (in inches)
|
| XS |
Up to 157 cm |
14"-16" |
| S |
157-167 cm |
15"-17" |
| M |
168-178 cm |
16"-19" |
| THE |
178-185 cm |
18"-20" |
| XL |
Over 185cm |
20"-23" |
Sizes also vary depending on the type of MTB: full-suspension , hardtail or fat bike .
Children's bikes
The size depends on the size of the wheels, often associated with age:
| Age
|
Wheel Size
|
| 1-3 years |
12" |
| 2-4 years |
14" |
| 4-6 years |
16" |
| 5-8 years |
20" |
| 8-10 years |
24" |
| Over 10 years |
26"/27.5" |
What to do with half measures?
If you are between two sizes:
-
Comfort : Choose the larger size.
-
Performance : Go for the smaller size.
Final tips for choosing
-
Consult the manufacturer's instructions : Always check the brand's guidelines.
-
Ask an expert : a specialized workshop can help you choose based on your height, ideal reach and goals.
-
Test the bike : If possible, test the model you intend to purchase.
