---
product_id: 264916603
title: "Flatrock"
brand: "mongoose"
price: "€ 1588.45"
currency: EUR
in_stock: true
reviews_count: 8
category: "Mongoose"
url: https://www.desertcart.fi/products/264916603-flatrock
store_origin: FI
region: Finland
---

# 21-speed twist shifters for seamless control 6061 aluminum frame: lightweight & durable 29-inch wheels for trail dominance Flatrock

**Brand:** mongoose
**Price:** € 1588.45
**Availability:** ✅ In Stock

## Summary

> 🚵‍♀️ Own the trail, don’t just ride it!

## Quick Answers

- **What is this?** Flatrock by mongoose
- **How much does it cost?** € 1588.45 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/264916603-flatrock)

## Best For

- mongoose enthusiasts

## Why This Product

- Trusted mongoose brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Confident Control:** Mechanical disc brakes provide reliable stopping power in all weather conditions.
- • **Trail-Ready Traction:** Knobby mountain tires + double wall alloy rims deliver unmatched grip on any terrain.
- • **Heritage of Adventure:** From BMX pioneers to mountain trailblazers—Mongoose fuels your ride with 50+ years of legacy.
- • **Lightweight Durability:** Premium 6061 aluminum hardtail frame balances strength and agility for all-day rides.
- • **Smooth Shifting Mastery:** 21-speed drivetrain with twist shifters ensures you always find the perfect gear effortlessly.

## Overview

The Mongoose Flatrock is a versatile adult mountain bike featuring 29-inch wheels and a lightweight 6061 aluminum frame designed for riders 5'4" to 6'2". Equipped with a 21-speed drivetrain and mechanical disc brakes, it offers smooth gear shifting and reliable stopping power for diverse terrains. Its knobby tires and double wall alloy rims ensure durable traction, while the front suspension fork absorbs bumps for a controlled ride. Backed by Mongoose’s 50+ years of BMX and action sports expertise, the Flatrock is built to push limits and elevate your off-road adventures.

## Description

Adventure starts where the pavement ends with the Mongoose Flatrock DX, a mountain bike built for all-terrain fun. With 29-inch wheels, this mountain bike for men and women is ideal for riders between 5'4" - 6'2" and is ready to head off the beaten path. Its alloy rims and knobby mountain tires provide the traction and durability needed to conquer new terrain with confidence. The lightweight 6061 aluminum frame is easy to handle while delivering big-time performance. Equipped with twist shifters and a rear derailleur, this 21-speed bike ensures smooth shifting and a wide gear range for tackling varied terrain. Mechanical disc brakes provide reliable all-weather stopping power, keeping riders in control. Whether climbing hills, cruising the trail, or heading off the bike path, the Flatrock DX is ready for the adventure. Assembly is easy with a few common household tools and the included instruction guide. At Mongoose, we know our roots – as pioneers in BMX and action sports for over 50 years, we're dedicated to delivering an epic ride every time. Get ready to push the limits.

Review: The kiddo likes it. - I had a little bit of trouble getting the breaks set correctly but that was definitely my own incompetence. I watched a YouTube video & was eventually able figure it out. Overall it's a great kid's bike and very pretty!
Review: Great size for a 10yo - We just gave this to our 10yo son for his birthday and we are very happy with it. I was torn between purchasing a 24inch or 26th inch, but the 24inch is perfect. The frame size coupled with the 24inch wheels is the ideal size for him, the larger size would have been too big. For reference he stands at approximately 4ft 8in, and he still has lots of room to grow with it. I am 5ft 3in and can also ride it. Walmart advertises this size as being suitable for 10-14yo and I think that is pretty accurate. The bike is not the lightest compared to higher end mountain bikes, but this will be used for neighborhood riding and going on park trails. And for the price, I was expecting a solid feeling frame. First impressions tell us the quality is good, comparable to any other bike. It was very simple to assemble. We did take it to a local bike store to have the gears checked and brakes tightened, but it was ridable out of the box. Overall for the price, we are really happy with the size and quality of this bike, and our son loves it!

## Features

- ADULT MOUNTAIN BIKE: Get ready to explore new trails on the Flatrock by Mongoose. Featuring 29-inch wheels, this bike is perfect for riders from 5'4" - 6'2" tall. Roll over difficult terrain with ease.
- BORN IN DIRT: Lightweight yet durable with a 6061 aluminum hardtail frame, this womens and mens mountain bike is ready to explore off the bike path and keep up with adventurous riders.
- BUILT FOR ADVENTURE: This Mongoose mountain bike is ready to roll with knobby mountain tires and double wall alloy rims for durable traction. The suspension fork absorbs bumps and uneven terrain, ensuring a smooth, controlled ride.
- SHIFT INTO GEAR: This 21-speed bike boasts twist shifters and a rear derailleur for smooth shifting and the right gear for your ride. Mechanical disc brakes provide reliable stopping power in varied conditions, giving riders control on rough terrain.
- KNOW YOUR ROOTS: As one of the OGs in BMX and action sports, Mongoose has helped bring this movement to the world. For over 50 years, we've been all about epic rides and pushing limits – and we're just getting started.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08PXN962L |
| Additional Features | Lightweight |
| Age Range (Description) | Adult |
| Age Range Description | Adult |
| Best Sellers Rank | #52,241 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #29 in Mountain Bikes |
| Bicycle Drivetrain Type | Derailleur |
| Bicycle Gear Shifter Type | Twist Grip |
| Bike Type | Mountain Bike |
| Brake Style | Disc |
| Brand | Mongoose |
| Brand Name | Mongoose |
| Color | Red |
| Customer Reviews | 4.1 out of 5 stars 426 Reviews |
| Derailleur Configuration | Rear |
| Frame Material Type | Aluminum |
| Included Components | Flatrock Bike |
| Is Assembly Required | Yes |
| Is Autographed | No |
| Item Type Name | Mountain Bike |
| Item Weight | 16.8 Kilograms |
| Manufacturer | Pacific Cycle, Inc |
| Minimum User Height | 5 Feet |
| Model Name | Flatrock |
| Model Number | R5864 |
| Model Year | 2021 |
| Number Of Speeds | 21 |
| Number of Handles | 21 |
| Number of Speeds | 21 |
| Power Source | Pedal power |
| Seat Material | Plastic or synthetic material |
| Size | 18-Inch Frame/29-Inch Wheels |
| Style Name | Bike |
| Suspension Type | Front |
| UPC | 038675236325 |
| Warranty Description | Limited Lifetime |
| Warranty Type | Limited |
| Wheel Material | Aluminum |
| Wheel Size | 29 Inches |

## Product Details

- **Bike Type:** Mountain Bike
- **Age Range (Description):** Adult
- **Brand:** Mongoose
- **Number of Speeds:** 21
- **Color:** Red
- **Wheel Size:** 29 Inches
- **Frame Material:** Aluminum
- **Suspension Type:** Front
- **Special Feature:** Lightweight
- **Included Components:** Flatrock Bike

## Images

![Flatrock - Image 1](https://m.media-amazon.com/images/I/81eVzlMwsKS.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ The kiddo likes it.
*by R***. on February 11, 2024*

I had a little bit of trouble getting the breaks set correctly but that was definitely my own incompetence. I watched a YouTube video & was eventually able figure it out. Overall it's a great kid's bike and very pretty!

### ⭐⭐⭐⭐⭐ Great size for a 10yo
*by A***Y on March 15, 2026*

We just gave this to our 10yo son for his birthday and we are very happy with it. I was torn between purchasing a 24inch or 26th inch, but the 24inch is perfect. The frame size coupled with the 24inch wheels is the ideal size for him, the larger size would have been too big. For reference he stands at approximately 4ft 8in, and he still has lots of room to grow with it. I am 5ft 3in and can also ride it. Walmart advertises this size as being suitable for 10-14yo and I think that is pretty accurate. The bike is not the lightest compared to higher end mountain bikes, but this will be used for neighborhood riding and going on park trails. And for the price, I was expecting a solid feeling frame. First impressions tell us the quality is good, comparable to any other bike. It was very simple to assemble. We did take it to a local bike store to have the gears checked and brakes tightened, but it was ridable out of the box. Overall for the price, we are really happy with the size and quality of this bike, and our son loves it!

### ⭐⭐⭐⭐ "You Get What You Pay For" Should be the Title for Every Bike Purchased in this Price Range
*by S***. on July 27, 2023*

It's a really heavy Mongoose but .. I knew that when I pressed the "add to cart" button. The hardware on the bike is mediocre but .. knew that. The bike does everything you need it to do .. unless you're a "bike person". If you ride this too hard .. it breaks. If you use it for transportation, or if you need a good beater for your kid who will be throwing this at the ground repeatedly until they move out of your house chasing some dream job in cosmetology or whatever nightmare they're dreaming of .. this is the bike for you. Assembly was complicated by the fact that it's just an okay bike. The tools they include are enough to assemble the bike with but, you can cut your assembly time in half if you just have some basic tools lying around the house. The bike rides and feels fine. With some fine tuning on the brakes and shifter mechanism, the bike would stop and shift fine. Solid "bang for the buck" on this but, if you spend another couple hundred bucks, there are better choices that would be worth much more than the extra investment. All in all .. this is okay and it's fine unless you're really trying to do anything outside the realm of "commuting".

## Frequently Bought Together

- Mongoose Flatrock 21-Speed Hardtail Mountain Bike, 24 to 29-Inch Wheels, for Men Women Boys and Girls, Front Suspension, 14.5 to 18-Inch Aluminum Frame Options
- Schwinn Thrasher Bike Helmet for Adult Men Women Age 14+ with Suggested Fit 58-62cm, Multi-Mode Rear LED Light or No Light Option, Lightweight with Adjustable Side and Chin Strap, Bike Accessories
- Ascher Ultra Bright USB Rechargeable Bike Light Set, Powerful Bicycle Front Headlight and Back Taillight, 4 Light Modes, Easy to Install for Men Women Kids Road Mountain Cycling Black

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**Shop now:** [https://www.desertcart.fi/products/264916603-flatrock](https://www.desertcart.fi/products/264916603-flatrock)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-04-25*