---
product_id: 446159053
title: "Flatrock Mountain Bike"
brand: "mongoose"
price: "¥402823"
currency: JPY
in_stock: true
category: "Mongoose"
url: https://www.desertcart.jp/products/446159053-flatrock-mountain-bike
store_origin: JP
region: Japan
---

# 21-speed precision shifting 6061 lightweight aluminum frame 29-inch all-terrain wheels Flatrock Mountain Bike

**Brand:** mongoose
**Price:** ¥402823
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** Flatrock Mountain Bike by mongoose
- **How much does it cost?** ¥402823 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/446159053-flatrock-mountain-bike)

## 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

- • **Trail-Ready Durability:** Robust 6061 aluminum frame paired with double wall alloy rims ensures a lightweight yet rugged ride built to last.
- • **Effortless Gear Mastery:** 21-speed twist shifters and rear derailleur deliver smooth, instant gear changes for conquering any incline or descent.
- • **All-Weather Stopping Power:** Front and rear mechanical disc brakes guarantee reliable, powerful braking performance in any weather condition.
- • **Superior Control & Comfort:** Element suspension fork absorbs shocks, providing enhanced control and a smoother ride on rough terrain.
- • **Optimized Fit for Adventurers:** Designed for riders between 5'4" and 6'2", this bike offers the perfect balance of agility and stability for your next trail conquest.

## Overview

The Flatrock Mountain Bike by Mongoose is a high-performance hardtail MTB featuring a lightweight 6061 aluminum frame and 29-inch wheels, engineered for riders 5'4" to 6'2". Equipped with a front suspension fork, 21-speed twist shifters, and mechanical disc brakes, it delivers smooth gear transitions, superior control, and reliable stopping power across all terrains. Double wall alloy rims add durability without extra weight, making it the ultimate choice for intermediate trail riders seeking adventure and precision.

## Description

Explore rad new trails with the Flatrock DX mountain bike by Mongoose. The Flatrock DX comes equipped with a lightweight aluminum hardtail frame and Element suspension fork that are ready to tear down the trail. 21-speed twist shifters and rear derailleur provide effortless gear changes, while mechanical disc brakes deliver superior stopping power in all conditions. Plus, double wall alloy rims offer lightweight durability. Get out there and explore with the Mongoose Flatrock DX.

## Features

- Hardtail MTB with a lightweight 6061 aluminum frame and 29-inch wheels is perfect for all terrain adventures, best fit to riders 5'4" to 6'2" tall
- Element suspension fork improves performance and control while providing a smoother ride
- 21-speed twist shifters and rear derailleur provide effortless gear changes when riding up an incline or speeding down a decline
- Enjoy exceptional stopping power in any weather condition with the front and rear mechanical disc brakes, providing superior braking performance
- Experience lightweight durability with the double wall alloy rims

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08PXN962L |
| Additional Features | Lightweight |
| Age Range Description | Adult |
| Bicycle Drivetrain Type | chain drive |
| Bicycle Gear Shifter Type | Twist Grip |
| Bike Type | Mountain Bike |
| Brake Style | Linear Pull |
| Brand Name | Mongoose |
| Color | Red |
| Customer Reviews | 4.1 4.1 out of 5 stars (272) |
| Derailleur Configuration | Rear |
| Frame Material Type | Aluminum |
| Included Components | Flatrock Bike |
| Intended Riding Terrain | Mountain Terrain, Unpaved Trails |
| Is Assembly Required | Yes |
| Is Autographed | No |
| Item Type Name | Mountain Bike |
| Item Weight | 16.8 Kilograms |
| Manufacturer | Pacific Cycle, Inc |
| Model Name | Flatrock |
| Model Number | R5864 |
| Model Year | 2021 |
| Number Of Speeds | 21 |
| Number of Handles | 21 |
| Power Source | Pedal power |
| Seat Material | Plastic or synthetic material |
| Size | 18-Inch Frame/29-Inch Wheels |
| Skill Level | Intermediate |
| Specific Uses For Product | Trail |
| Style Name | Modern |
| Suspension Type | Front |
| UPC | 038675236325 |
| Wheel Material | Aluminum |
| Wheel Size | 29 Inches |

## Product Details

- **Age range (description):** Adult
- **Bike type:** Mountain Bike
- **Brand:** Mongoose
- **Colour:** Red
- **Number of speeds:** 21

## Images

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

## Available Options

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

## 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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.jp/products/446159053-flatrock-mountain-bike](https://www.desertcart.jp/products/446159053-flatrock-mountain-bike)

---

*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-06-18*