AVASTA 24" 21-Speed Mountain Bike for Adults (13+) - Thrax
Recommended age: 13+
Adult riding · Ages 13+
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Free Shipping within the USGet your bike delivered to your door at no extra cost!
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365-Day WarrantyEnjoy peace of mind with our full year of coverage on every bike.
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Pair it with
Glerc Kids MTB Helmet(S & M)
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- Lightweight Design: Weighing just around 240g, this kids helmet is designed to feel light and comfortable for everyday use.
- 360° Breathable Ventilation: Built with 360° airflow vents to help keep kids cool and comfortable during active rides.
- Reliable Head Protection: A properly fitted helmet helps reduce the risk of head injuries during biking, scootering, and outdoor play.
- Durable & Built for Adventure: Made with durable materials to support safe and confident riding across everyday outdoor activities.
- Versatile for Daily Activities: Ideal for biking, scootering, and general outdoor play, making it a great all-around safety essential for kids.
- Lightweight Design: Weighing just around 240g, this kids helmet is designed to feel light and comfortable for everyday use.
- 360° Breathable Ventilation: Built with 360° airflow vents to help keep kids cool and comfortable during active rides.
- Reliable Head Protection: A properly fitted helmet helps reduce the risk of head injuries during biking, scootering, and outdoor play.
- Durable & Built for Adventure: Made with durable materials to support safe and confident riding across everyday outdoor activities.
- Versatile for Daily Activities: Ideal for biking, scootering, and general outdoor play, making it a great all-around safety essential for kids.
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Black Classic Brass Bell$14.99$17.99 -
Silvery Classic Brass Bell$14.99$17.99 -
Front-Mounted Black Bike Light$19.99$22.99
What's In The Box
Our bikes come 85% pre-assembled for easy setup. Assembly tools and additional accessories are included.
Detailed ChartSizing Chart
Recommended age: 13+. Use rider height, inseam and reach to choose a comfortable fit: 24-inch wheels for riders 53–66 inches tall; 26-inch wheels for riders 63–70 inches tall.
| Wheel Size | Rider Age | Rider Height | Inseam | Bike Weight |
|---|---|---|---|---|
| 24" | 13+ | 53"-66" | 24"-29" | 34 lbs |
| 26" | 13+ | 63"-70" | 28"-33" | 35 lbs |
Top Features
- High-Tensile Steel Frame
- Dual Disc Brakes
- Front Suspension
- 21-Speed Gear Shifters
- Half-Hidden Brake Cables
- 24" & 26" Size Options
- Adult Riding · Ages 13+
Delivery
Processing Time
Orders ship within 24 hours on business days. Tracking details will be sent to your order email once shipped.
Shipping Time
- 3–5 Business Days (Typically) After Shipment
Delays may occur due to weather, holidays, carrier issues, or other unforeseen factors. View Full Shipping Policy.
Engineered to Ride Further
Thrax is crafted for riders who value performance and refined design, offering a balanced ride that feels confident on both pavement and trail.
FAQs
Who is the Thrax 24 inch 21 speed mountain bike designed for?
The 24-inch Thrax 21-speed mountain bike is designed for adult riding and riders aged 13+, with a recommended height of 53–66 inches. Check rider height, inseam and handlebar reach when choosing your size. You should be able to stand over the frame comfortably and reach both brake levers.
Who should choose the Thrax 26 inch 21 speed mountain bike?
The 26-inch Thrax 21-speed mountain bike is designed for adult riding and riders aged 13+, with a recommended height of 63–70 inches. Check rider height, inseam and handlebar reach when choosing your size. You should be able to stand over the frame comfortably and reach both brake levers.
What is the difference between the 24-inch and 26-inch Thrax?
The main difference is wheel size and rider fit; both versions share the Thrax’s 21-speed drivetrain, front suspension and dual disc brakes. The 24-inch model can feel easier to control for a shorter rider, while the 26-inch model offers a better riding position for someone taller. Riders within the overlapping 63–66-inch range should also compare inseam, reach and riding confidence.
What does 21 speed mean on a mountain bike?
A 21 speed mountain bike provides a broad selection of gear combinations for changing pedaling resistance. Lower gears make climbing and starting easier, while higher gears are useful for faster riding on flat or descending sections. Some gear combinations overlap, so “21 speed” does not necessarily mean 21 completely different gear ratios.
How should I shift the gears on the Thrax?
Keep pedaling lightly while shifting and move into an easier gear before starting a climb. Avoid shifting under heavy pedal pressure and avoid extreme gear combinations that force the chain to run at a sharp angle. Regular cleaning and chain lubrication will also help the drivetrain shift smoothly.
Is the Thrax suitable for both trails and paved roads?
Yes. Its front suspension, 21-speed gearing and dual disc brakes make it suitable for recreational trails, uneven paths and everyday paved riding. Riders looking for more terrain-focused options can compare Thrax with other models in the Mountain Bikes collection.
What do the front suspension and dual disc brakes do?
The front suspension helps absorb impacts from bumps and uneven surfaces, improving comfort and front-wheel control. The dual disc brakes provide braking at both wheels, but riders should test the brake-lever reach and braking response before every ride, especially after assembly or adjustment.
