Mongoose Argus Trail or ST Fat Tire Mountain Bike, 20, 24 or 26 Inch Bike for Kids and Adults, 7 or 16 Speed, Aluminum or Steel Frame, Knobby Mountain Fat Tires, Mechanical Disc Brakes

Price: $434.99 - $335.56
(as of Jun 24, 2026 18:10:47 UTC – Details)
Buy On Amazon

Adventure starts where the pavement ends with the Mongoose Argus Trail, a kids fat tire mountain bike built for all-terrain fun. With 20-inch wheels, this boys and girls mountain bike is ideal for riders between 4’3″” – 5′, perfect for bringing young explorers into the action. Its aluminum rims and 4-inch-wide fat tires provide the traction and durability needed to conquer dirt, gravel, sand, and snow with confidence. The lightweight yet tough aluminum frame is easy to handle while delivering big-time performance. Equipped with a Shimano 2×8 drivetrain, this 16-speed bike ensures smooth shifting and a wide gear range for tackling varied terrain. Mechanical disc brakes provide reliable all-weather stopping powers, keeping kids in control no matter the ride. Whether climbing hills, cruising the trail, or charging through the elements, the Argus Trail 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.
FAT TIRE MOUNTAIN BIKE: Your introduction to the world of fat tire adventures awaits with the Argus by Mongoose. Featuring 26-inch wheels, this bike is perfect for riders from 5’7″ – 6’1″ tall. Roll over all sorts of difficult terrain with ease.
ALL-TERRAIN, ALL-SEASON: 4-inch-wide knobby fat tires deliver massive grip, giving you control even on loose sand, deep snow, gravel and sketchy trails where others might slip up.
BUILT TOUGH: A durable steel hardtail frame and rigid fork are made to take a beating, while fat tires and drilled aluminum rims help keep the wheels lightweight.
SHIFT INTO GEAR: This 7-speed bike boasts Shimano twist shifters with rear derailleur for smooth shifting and the right gear for your ride. Mechanical disc brakes provide reliable stopping power in varied conditions, keeping riders in control.
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.