Search  for anything...

Mongoose Grafton Mountain Bike, 21 Speed, Aluminum Frame, Knobby Mountain Tires, Suspension Fork, Trigger Shifters, Mechanical Disc Brakes | Trigger Shifter, Aluminum Frame, Front Suspension

  • Based on 135 reviews
Condition: New
Checking for inventory...

Notify me when this product is back in stock

$329.99 Why this price?
Save $20.00 was $349.99

Buy Now, Pay Later


As low as / mo
  • – Up to 36-month term if approved
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: Unavailable
Fulfilled by Amazon
Available payment plans shown during checkout

Size: 24-Inch Wheels


Color: Purple


Features

  • ADULT AND YOUTH MOUNTAIN BIKE: Go exploring with the Grafton by Mongoose. Featuring 24-inch wheels, this bike is perfect for riders from 4'8" - 5'6" tall. Built for adult and youth riders, this bicycle brings everyone in on the fun.
  • BORN IN DIRT: From pavement to singletrack, the aluminum mountain frame is built for adventure. With modern geometry and an internal headset, this girls and boys mountain bike offers a clean, streamlined look.
  • BUILT FOR ADVENTURE: This Mongoose kids bike is ready to roll with 2.3-inch-wide knobby mountain tires for superior grip and stability. The suspension fork absorbs bumps and rough terrain, ensuring a smooth, controlled ride.
  • SHIFT INTO GEAR: This 21-speed bike features trigger shifters for smooth transitions and the right gear for your ride. Mechanical disc brakes provide reliable all-weather stopping power, giving riders control on varied 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.

Description

Adventure starts where the pavement ends with the Mongoose Grafton, an adults and kids mountain bike built for all-terrain fun. With 24, 26 or 27.5-inch wheels, this adults, boys and girls mountain bike is ideal for riders between 4'8"" - 6'0"", perfect for bringing all explorers into the action. Its aluminum rims and 2.3-inch-wide knobby mountain tires provide superior traction and stability. The aluminum mountain frame is easy to handle while offering a clean look with its modern geometry and internal headset. Equipped with trigger shifters, this 21-speed bike ensures smooth shifting and a wide gear range for tackling your ride. Mechanical disc brakes provide reliable stopping power in varied conditions, keeping riders in control. Whether taking on the trail or cruising the neighborhood, the Grafton 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.

Bike Type: Mountain Bike


Age Range (Description): Youth


Brand: Mongoose


Number of Speeds: 21


Color: Purple


Wheel Size: 24 Inches


Frame Material: Aluminum


Suspension Type: Front


Special Feature: Aluminum Frame, Lightweight, mountain bike


Included Components: Mountain Bike


Bike Type: Mountain Bike


Number Of Speeds: 21


Suspension Type: Front


Additional Features: Aluminum Frame, Lightweight, mountain bike


Brake Style: Disc


Specific Uses For Product: Trail


Power Source: Pedal power


Bicycle Gear Shifter Type: Trigger


Skill Level: Beginner


Derailleur Configuration: Rear


Bicycle Drivetrain Type: chain drive


Color: Purple


Theme: Outdoor Adventure


Style Name: Purple


Frame Material Type: Aluminum


Wheel Material: Aluminum


Seat Material: Vinyl


Age Range Description: Youth


Brand Name: Mongoose


Included Components: Mountain Bike


Model Name: Grafton


UPC: 038675091290


Manufacturer: Pacific Cycle, Inc.


Warranty Description: One year limited warranty on parts, 30 days on wearable parts


Item Type Name: Mountain Bike


Wheel Size: 24 Inches


Size: 24-Inch Wheels


Item Weight: 15.46 Kilograms


Warranty Type: Limited


Maximum Weight Recommendation: 300 Pounds


Is Assembly Required: No


Minimum User Height: 64 Inches


Frequently asked questions

This product is currently out of stock. Please check back later for shipping info.

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Must Buy!
Size: 26-Inch Wheels Color: Teal
Great bike!
Reviewed in the United States on April 6, 2026 by Kristle

  • JUNK BIG TIME
Size: 24-Inch Wheels Color: Purple
totaly messed up. shock are stuck and do not move, front gear and procket are messed up and do not aline and stay in alinement. DO NOT BUY THIS BIKE!!!!
Reviewed in the United States on February 14, 2026 by Richard H.

  • Great mountain bike for beginners and everyday riding
Size: 26-Inch Wheels Color: Teal
This Mongoose Grafton mountain bike is a great bike for the price. It rides smoothly and feels sturdy on pavement, dirt trails, and light off-road riding. The suspension helps absorb bumps, making the ride comfortable even on rougher surfaces. Assembly was straightforward and everything fit together well. Once set up, the bike feels solid and well built. The brakes and gears work smoothly and make it easy to ride uphill or cruise comfortably. This is a great option for anyone looking for a reliable, good-looking mountain bike without spending a lot of money. I’m very happy with it and would definitely recommend it. ... show more
Reviewed in the United States on January 9, 2026 by Amazon Customer

  • Great bike
Size: 26-Inch Wheels Color: Tan
Beautiful bike. Good quality. Smooth ride.
Reviewed in the United States on February 16, 2026 by Jessica K

  • Poor customer service
Size: 26-Inch Wheels Color: Teal
The media could not be loaded. I have constant front tire inner tubeblow up’s at the stem. I ordered last December for Christmas and have the chance to use at the beginning of April. Now it is out of warranty. Customer service will send me the replacement rim for an amazing price of $50.00. Thank you Amazon for having responsible suppliers. ... show more
Reviewed in the United States on April 7, 2026 by Bob Ponty

  • Nice and strong bicycle.
Size: 27.5-Inch Wheels Color: Blue
Easy to assemble, smooth ride. Why did you pick this product vs others?: Good brand and sturdy design, and nice blue color.
Reviewed in the United States on June 20, 2025 by Javier Rodriguez Salomon

  • Very Good For The Price
Size: 26-Inch Wheels Color: Teal
This bike is very good for the price. After riding it daily it has been reliable and fun to ride on flat trails and marshland where I live in Hawaii. I have not taken it on any mountain areas yet so not sure how it would hold up there. The frame is solid, quite light in weight (I think aluminum) it shifts and handles well, and the disc brakes and tires are very good. The only complaints for me would be it has hard rough suspension, you will feel every bump, and a hard seat. Overall a very decent bike for the price and definitely recommended. Sweet color choices too. ... show more
Reviewed in the United States on August 26, 2025 by THEO

  • A great size with great features
Size: 26-Inch Wheels Color: Tan
This was my 12-yo grandson’s first large format bike. He helped assemble it (easy to do) and rode it out of the garage. Learning the Shimano 21 speed system took the time to climb his first hill. Great bike!
Reviewed in the United States on January 4, 2026 by Bob Pitchford

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for inventory...