Ninety One Monster X 4.0
by Ninety One
Category: Fat
The Ninety One Monster X 4.0 is a Fat bike from Ninety One. It's built around a carbon hi-tensile steel - tig welded frame and a v91 suspension fork. Equipped with rapid & secure mechanical disc brakes brakes. Rolls on 26"/66cm wheels with 4.0" Oversize Hi-Traction Nylon tyres.
Ninety One Monster X 4.0 Specifications
Frame & Fork
| Frame | Carbon Hi-Tensile Steel - TIG Welded |
| Fork | V91 Suspension |
| Headset | High-Precision Threadless Headset KENLI |
Brakes
| Brakes | Rapid & Secure Mechanical Disc Brakes |
Cockpit & Seating
| Handlebar | Steel Handlebar |
| Stem | Alloy Stem |
| Saddle | Premium Quality PU Seat & Wires |
Other Specifications
| Highlights | Hi-tensile tig-welded frame with a smooth suspension fork.; High-performance Purk disc brakes for total control.; Wide 4.0" nylon tires and wide steel rims.; Sleek design accented with durable water decals. |
| Age | 11+ Yrs |
| Height | 4'11"-5'7" |
| Shifting | 21 Speed Shimano Tourney |
| Stickers | Striking Colors Water Transfer Decals |
Drivetrain
| Crankset | Durable Steel Cotterless |
| Bottom Bracket | Sealed Cartridge |
| Cassette | Frictionless 18T Fully Sealed |
Wheels & Tyres
| Rims | Durable Steel |
| Hubs | Durable Steel Mega Hubs |
| Wheel Size | 26"/66cm |
| Tyres | 4.0" Oversize Hi-Traction Nylon |
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Frequently Asked Questions
Common questions about Fat bikes like this one.
What frame and fork does the Ninety One Monster X 4.0 have?
The Ninety One Monster X 4.0 comes with a Carbon Hi-Tensile Steel - TIG Welded frame and a V91 Suspension fork.
What brakes does the Ninety One Monster X 4.0 use?
The Ninety One Monster X 4.0 is equipped with Rapid & Secure Mechanical Disc Brakes.
What are fat bikes designed for?
Riding on soft, unstable surfaces like sand, snow, and loose gravel - the oversized, low-pressure tyres add flotation and grip that a standard bike lacks.
Can a fat bike be ridden on normal roads?
Yes, though the wide tyres add rolling resistance, making it slower and more tiring than a standard bike on pavement.
Are fat bikes heavier than regular bikes?
Generally yes, due to the wider rims, tyres, and reinforced frame needed to handle the terrain they're built for.
Do fat bike tyres need special tyre pressure?
Yes - they're typically run at much lower pressure than standard tyres to maximize grip and cushioning on soft terrain.