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Gravity Superfast 20 Inch Wheel BMX Bike — main product image
Gravity

Gravity Superfast 20 Inch Wheel BMX Bike

20 Inch

Lightweight aluminum-frame 20-inch BMX bike with dual coaster and hand brakes for young riders.

$299.00*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Gravity Superfast 20-Inch BMX Bike is built around a lightweight aluminum frame that makes it easier for younger riders to handle, control, and carry compared to heavier steel alternatives. The 20-inch aluminum alloy wheels are the standard BMX size, providing durability for everyday riding while keeping the bike's total weight manageable. Its Matt Electron Blue finish gives the bike a clean, modern look that appeals to young riders ready to hit the neighborhood streets or local park.

A standout feature of the Superfast is its dual braking system, combining a rear coaster brake with a front hand-operated caliper brake. This setup gives riders two independent methods of stopping, which is especially useful for younger cyclists who may be more comfortable with one style over the other. The single-speed drivetrain keeps things simple and maintenance-friendly, with no derailleurs or shifters to adjust. The bike does require partial assembly and tuning before the first ride, so having basic bike tools on hand and some familiarity with bicycle setup is recommended. A bicycle pump is included with purchase to get tires inflated and ready to go.

Key Features

Aluminum Frame Means Easier to Control and Ride!

Coaster and Hand Brakes!

Aluminum Alloy Wheels!

Durable and Safe!

Requires Partial Assembly and Tuning Before Riding!

Specifications

Brand
Gravity
Model
Superfast
Bike Type
BMX
Age Range
Youth
Wheel Size
20 inches
Frame Material
Aluminum
Wheel Material
Aluminum Alloy
Number of Speeds
1 (Single-Speed)
Brake Style
Caliper (hand) and Coaster
Color
Matt Electron Blue
Included Components
Bicycle Pump
Assembly
Partial assembly and tuning required

Pros & Cons

👍 Pros

  • Aluminum frame is lighter than steel, making the bike easier to maneuver and control for younger riders.
  • Dual braking system with both coaster and hand brakes provides redundant stopping power.
  • Aluminum alloy wheels add durability while keeping overall weight down.
  • Single-speed drivetrain is simple, reliable, and requires minimal maintenance.
  • 20-inch wheel size is the standard BMX format, making tire and parts replacement straightforward.

👎 Cons

  • Requires partial assembly and tuning out of the box, which may be challenging without bike tools or experience.
  • Single-speed only, so it is not well-suited for hilly terrain or varied riding conditions.
  • No front suspension, which limits comfort on rough surfaces.
  • Limited sizing information makes it harder to confirm proper fit before purchasing.

Frequently Asked Questions

With 20-inch wheels, this BMX bike is generally suited for youth riders. Check the standover height against your child's inseam for proper fit.
No, the Gravity Superfast requires partial assembly and tuning before riding. Basic tools and some mechanical ability are needed to complete setup.
It features a dual brake system with both a coaster brake (pedal backward to stop) and a hand-operated caliper brake, giving riders two independent stopping methods.
The frame is made of aluminum, which makes the bike lighter and easier to handle compared to steel-framed BMX bikes.
This is a single-speed BMX bike, which is standard for the BMX category and keeps the drivetrain simple and low-maintenance.

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