Mongoose Malus Mens and Women Fat Tire Mountain Bike
- Mountain Bike
- 26 inches
- Pedal
- Alloy Steel
- Better rated than 72%
- More reviewed than 93%
A heavy, stable entry-level fat tire bike that handles snow, sand and hills well for the price, with a real risk of shipping damage and some low quality small parts.
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How it ranks among the 95 mountain bikes we track
4.4★ across 1,500 Amazon ratings, Bayesian-smoothed toward the category average.
1,500 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 95 mountain bikes we track - how the scorecard works · full mountain bikes data report. Confidence: medium - useful but incomplete evidence.Last refreshed Jun 21, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
A steel-frame fat tire mountain bike built around 26 inch wheels and 4 inch wide knobby tires, running a 7-speed drivetrain with a Shimano rear derailleur and front and rear disc brakes, sized for riders roughly 5 feet 4 inches to 6 feet 2 inches tall.
Reviewers describe this less as a technical trail bike and more as a heavy, stable platform that shrugs off snow, sand and loose gravel, which lines up with the wide 4 inch tires and steel frame. A few buyers specifically choose it as a base for e-bike conversions, since the steel frame can be welded and modified for a motor mount, something an aluminum frame would not allow.
- 26 inch wheels with 4 inch wide knobby tires
- Steel mountain-style fat tire frame, fits riders 5'4 to 6'2
- 7-speed drivetrain with Shimano rear derailleur
- Front and rear disc brakes
Who it's for
Fits riders wanting an entry-level fat tire bike for mixed terrain, snow or sand, including buyers planning an e-bike conversion. Less suited to riders wanting a lightweight bike, since the steel frame and wide tires add noticeable weight and effort to turn.
What buyers say
From Amazon customer reviews.
Multiple reviewers were surprised by how well the bike climbed hills and handled snow, sand and loose gravel given its weight, and several praised the steel frame's durability, including buyers who use it as a base for e-bike conversions. The recurring complaint was shipping damage: more than one buyer found warped gear plates or derailleur-area metal on arrival, and one reported a stripped front axle and described customer service as hard to reach.
Strengths and trade-offs
Drawn from this product's published specifications.
- Stable traction in snow, sand and loose gravel
- Steel frame climbs hills, holds heavier riders
- Popular, weldable base for e-bike conversion projects
- Harder to turn and roll than standard bikes
- Shipping damage reported to derailleur and gear plates
- Some parts, like the front axle, arrived poorly finished
Performance notes
The 4 inch wide knobby tires and steel frame favor stability and traction over agility. Several buyers found it climbed hills better than expected for its weight, and it performed well in snow, sand and loose gravel. The tradeoff, per multiple reviews, is that it takes more effort to get rolling and to turn compared with a standard-width bike, and shipping damage to the derailleur area and gear plates showed up in more than one delivery.
Specifications
| Brand | Brand |
|---|---|
| Model | R5714KMA |
| Dimensions & fit | |
| Wheel Size | 26 inches |
| Item Weight | 35 pounds |
| Size | 18 inches |
| Minimum User Height | 64 inches |
| Capacity & performance | |
| Bicycle Gear Shifter Type | Trigger |
| Bicycle Drivetrain Type | Derailleur |
| Number Of Speeds | 7 |
| Age Range Description | Adult |
| Power & efficiency | |
| Power Source | Pedal |
| Construction & materials | |
| Frame Material Type | Alloy Steel |
| Wheel Material | Alloy |
| Seat Material | Polyurethane (PU) |
| Color | Silver/Yellow |
| Included components | |
| Included Components | Bicycle |
| Warranty & support | |
| Warranty Type | Limited |
| Warranty Description | Limited lifetime |
| Other details | |
| Suspension Type | No Suspension |
| Bike Type | Mountain Bike |
| Is Assembly Required | No |
| Is Autographed | No |
| Skill Level | Intermediate |
| Brake Style | Disc |
| Additional Features | fat tire, mountain bike |
| Item Type Name | Cruiser Bicycle |
| Specific Uses For Product | Trail |
| Derailleur Configuration | Rear |
| Style Name | Mountain |
| Intended Riding Terrain | Mountain Terrain, Unpaved Trails |
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How it compares
This product against the closest alternatives we track in mountain bikes.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Mongoose Malus Mens and Women Fat Tire Mountain BikeThis product | 4.4 / 5 | 1,500 | 4.1 / 5 |
| Mongoose Dolomite Fat Tire Mountain Bike | 4.4 / 5 | 2,281 | 4.1 / 5 |
| Schwinn Bonafide Men and Women Mountain BikeSchwinn | 4.2 / 5 | 667 | 4.1 / 5 |
| WEIZE Mountain Bike, 24 26 27.5 inch Outdoor MTB Bicycle, 6/18-Speed High-Carbon Steel…Weize | 4.1 / 5 | 599 | 4.0 / 5 |
| Huffy Mountain Bikes for MenHuffy | 4.0 / 5 | 975 | 4.0 / 5 |
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Questions about the Brand R5714KMA
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What size riders fit the Mongoose Malus?
The steel frame is built for riders roughly 5 feet 4 inches to 6 feet 2 inches tall.
Does the Mongoose Malus have disc brakes?
Yes, it has both front and rear disc brakes.
Is the Mongoose Malus a good base for an e-bike conversion?
Some buyers specifically chose it for that purpose because the steel frame can be cut and welded for a motor mount, something reviews note an aluminum frame would not allow.