The 8 Best Mountain Bikes for Kids of 2021


There is no good feeling like having the little yet important persons in the family to accompany the adults in mountain biking and other outdoor adventures. Like us, kids love mountain biking as well and like to explore the integrities of trails and descent on their bikes.

The level of enjoyment that kids derive from mountain biking also depends on how well the bike performs and its integral specifications. Though the bike need not have exceptional specs and be very expensive, it needs to be lightweight and match the height and driving preferences of the child.

Weight is an important factor that differentiates how well the bike performs. Bikes that are too heavy demand lot of work output from the rider, tiring and frustrating the children sooner than expected.

Luckily, the following list of mountain bikes for kids are lightweight and help kids embraces the sport with interest. There are different mountain bikes for boys and girls that help these young riders explore new trails and places where the regular bikes can’t enter. They are also cost effective and have loads of comfort and safety factors for children. 

The 8 Best Mountain Bikes for Kids – [2021]

Best Boy’s Mountain Bikes

  1. Guardian Kids Bikes for Boys/Girls
  2. HASA 18 Speed Kids Mountain Bike
  3. Mongoose Ledge 2.1 Kids Mountain Bike
  4. Diamondback Bicycles Sync’r Kid’s Mountain Bike

Best Girl’s Mountain Bikes

  1. Schwinn High Timber Mountain Bikes
  2. Razor Angel Girls’ Bike
  3. Raleigh Bikes Girls Jazzi 20 Bike
  4. New Diamondback Cobra 20 Complete Bike

Best Mountain Bikes for Kids

Best Mountain Bikes for Kids Reviews

Best Boy’s Mountain Bikes

#1. Guardian Kids Bikes for Boys/Girls


  • Dimensions: 53 x 8 x 29 inches
  • Weight: 20.5 pounds
  • Lightweight aluminum construction
  • Safe brake system
  • ASO shark task
  • Easy ride geometry
  • 99% assembled

The Guardian’s kids Bikes for both boys and Girls are one of the world’s safest bikes for children. The bike features the safest brake system that prevents accidents from handlebar tripping and also helps kids to stop faster.

The bike is the best for both boys and girls who are in the height range of 3.9” to 4.5”.  It is of lightweight Aluminum construction and weight only 20.2 pounds. Thus, it is easy to handle and render absolute safety and better control.

Original-Lightweight-Construction-AssemblyThe bike incorporates kid specific easy reach lever, double wall rims, kickstand, and simple 1 speed. 99% Pre-assembling is done with shipping it takes up only 10 minutes of setting up time. It has easy ride geometry with a lower center of gravity to balance at ease.

The bike has a low step-in height to ease getting on and off the bike by kids. All the frames of the bike are hand weld with lightweight Aluminum for better control and maneuverability.

Mountain Bikes for Kids

#2. HASA 18 Speed Kids Mountain Bike


  • Weight: 11.6 kg
  • Bike for competition
  • Suitable for ages: 7-9
  • Fork: 20” Alloy fork
  • Tires: 1.95×20”
  • Thread less alloy head
  • 4 finger brake levers
  • Front derailleurs

The HASA 18 speed mountain bike for kids is one of the best quality bikes for boys in the age group of 7-9 years. The bike is an excellent deal for small boys as its chain ring at the front makes it easier for them to push the cranks and go off the road.

The bike is extremely cost-effective and lightweight, weighing only 32 pounds. Its design geometry makes the bike efficient for bike races and competitions among kids.

The tires have a 20” alloy fork with a base of 1.95 x 20 inches. There are 4 brake levers to prevent accidents while riding. The front derailleurs render excellent stability and suspension for the little riders.

HASA-Speed-Mountain-ShimanoThe bike has a lifetime warranty on the frames and one year warranty on the parts except on the brake pads, tubes, and the tires. Pre-assembling up to 95% from the manufacturers helps in assembling the bike easily within few minutes.

Users only have to assemble the stem, pedals, front wheel and the seat post from the shipping. Little boys would love the ergonomic design and easy maneuverability of the lightweight mountain bike.

Mountain Bikes for Kids

#3. Mongoose Ledge 2.1 Kids Mountain Bike


  • Dimensions: 63 x 23 x 38 inches
  • Weight: 46.6 pounds
  • Steel suspension frame and fork
  • 21 speed twist shifters
  • Pull brakes for excellent stopping power
  • Reliable gear support
  • Mountain style athletic seat

The Mongoose Ledge 2.1 Kids Mountain Bike is an excellent addition for the mountain gear for young boys. The bike features a complete suspension frame of steel and the fork to smooth the bumps on the rough roads.

Its rear derailleurs and the twist shifters help in precise gear changing. Its linear alloy pulley brakes offer excellent stopping power in any terrain. Gear support comes from its 3 piece crank and strong alloy rims.

The sleek mongoose ledge comes in a red and silver color for a fierce color combination much loved by boys. Its lightweight feature and steel suspension system make it a bike of choice for boys.

The bike features 21 different speeds to maneuver in a variety of terrains, including steep hills and park rides around the neighborhood. Its crank system helps the bike with its gear transition smoothly. Other important and attractive features of the bike are its seat with adequate padding and linear braking system.

Mountain Bikes for Kids

#4. Diamondback Bicycles Sync’r Kid’s Mountain Bike

Diamondback BicyclesFeatures:

  • Dimensions: 63 x 23 x 38 inches
  • Weight: 46.6 pounds
  • Ages: 8-12 years
  • Height: 53-62 inches
  • Wide gear range
  • Hydraulic disc brakes
  • Aluminum frame body
  • Limited lifetime warranty

The Diamondback Bicycles for Kids is ideal for boys in the age group of 8-12 years and for those who are in the height range of 53-62 inches. Its superior suspension system with 80 mm fork renders excellent control over rough trails.

The speed drive train helps with a wide range of gears and smooth shifting. Its hydraulic disc brakes with adjusting levers help children to develop a passion for mountain biking. Its 24-inch wells and excellent design geometry renders the prompt fit and handling for young bikers.

Diamondback BicyclesSimilar to adult bikes, its double wall wheels with 2.35-inch grip are capable of taking up abuse and renders excellent stability and traction against rough terrains.

The bike has about 95% assembling during shipping; the rest of the assembly takes about 30 -60 minutes depending on the skill level. Many users review that the shipment comes in excellent packaging without any damage to the parts.

Mountain Bikes for Kids

Best Girl’s Mountain Bikes

#5. Schwinn High Timber Mountain Bikes


  • Dimensions: 3 x 47.2 x 24.8 inches
  • Weight: 40 pounds
  • Mountain frame with suspension fork
  • 21 speed derailleur at the rear
  • Front and rear pull brakes
  • Light and strong alloy rims
  • Adjustable seat post

The Schwinn High timber mountain bikes for girls has high-quality Schwinn frame with a suspension fork that offers the best control overriding on tough trails. Its shifts feature 21-speed derailleurs in the rear that enables quick changes in the gear.

Pull brakes both at the rear and the front of the bike helps girls with excellent stopping power irrespective of the roughness of the terrain. Alloy rims help with a strong, light and a durable riding experience for girls in the age group of 7-9 years. It is possible to adjust the height of the seat on the go without incurring any tools.

Schwinn-Girls-Timber-Mountain-BicycleThese mountain bikes feature a 29-inch wheel and are thus easy for little girls to take efficient turns even at low speeds. The bike frame is large enough so as to accommodate the seat for girls below 12 years of age.

The seat position is low, to help kids getting on and off the bike at ease. It is a sturdy bike and can accommodate even chubby children and can accept load up to 200 pounds. It requires easy assembling in a local bike store after shipment and the majority of its parts come with pre-assembling.

Mountain Bikes for Kids

#6. Razor Angel Girls’ Bike


  • Weight: 33.5 pounds
  • Strong steel fork and frame
  • 48 spokes, 20 inch rims
  • Hand brakes in the front and rear
  • Load capacity: 100 pounds
  • Ages: 8-14 years
  • Limited lifetime warranty

The Razor angel kid’s bike has a strong steel fork and frame with 20 inch rim and 48 spokes. The wheels are thus sturdy and hard enough to skim through tough terrains without falling and encountering accidents. Prompt braking even at low speeds is possible with the front and rear hand brakes of the bike.

The bike is ideal for girls in the age group of 8-14 years. The cool graphics on the bike and its durable steel frame impress girls very much. Irrespective of the age and height of the kids, the hand brakes are easy to reach for a safe ride.

The 20-inch tires offer additional stability and sturdiness on the roads and offer anti-fall rides for girls. The maximum load capacity for the bike is about 100 pounds. Some assembling is essential after the shipment.

The form and the frame have a limited lifetime warranty from the manufacturers. Other integral features of the bike are that it features, 28 spoke rims, 2 pegs and brakes at the front and rear.

Mountain Bikes for Kids

#7. Raleigh Bikes Girls Jazzi 20 Bike 


  • Weight: 27.6 pounds
  • Age group: 4-8 years
  • Height: 3.8-4.4 inches
  • Coaster and V brakes
  • Wide tires for stability and traction
  • Hand and coaster brakes

The Raleigh Bikes for Girls has been specifically designed for young riders who are just learning to ride on the park paths and the sidewalks. The bike has been specifically designed for girls who are in the age group of 4 – 8 years.

The height of the child should be between 3.8 to 4.4 inches to use this bike. Raleigh bikes for small girls feature a durable and lightweight frame. Its step through design helps in easy mounting and dismounting of the bike parts.

The bike features both V-brakes and coaster brakes that are reliable enough to enable girls to practice new braking techniques. Its tires are wide enough with the dimension of 20x 2.1 inches to offer better stability and traction.

The frame is of a lightweight 20 inch aluminum frame that is easy to mount and dismount. The bike’s chain guard keeps legs and pants from getting caught up in the chains. Partial assembling is done with shipment and might take up to 30 minutes to assemble the cycle completely.

Mountain Bikes for Kids

#8. New Diamondback Cobra 20 Complete Bike

Diamondback Cobra 20 Complete BikeFeatures:

  • Weight: 10.75 pounds
  • Age: 4-9 years
  • Height: 44-54 inches
  • Powerful brakes and suspension fork
  • 6 speed drive train with trigger
  • 40 mm travel fork
  • Linear pull brakes with adjustable levers

The New Diamondback Cobra complete bike features a 6 speed shimano drive train wit triggers. This feature makes shifting simple and offers the boost for all the climbs. The bike rides efficiently over roots and rocks just like professional bikes for adults.

Its adjusting reach levers and linear pull brakes helps keep the child safe and under control. Its durable steel frame is able to accept and adapt abuse of in experienced driving and adventurous rides.

Diamondback Cobra 20 Complete Bike 2Some of the cool features of the bike are its powerful brakes, suspension fork and 6 speed drivetrain. It is the most ideal bike for girls to explore beyond the confinement of their neighborhood. The big tires of the bike are excellent to drive across dirt and tough terrains.

The bike is ideal for girls who are between 4 and 9 years of age and those who are 44 inches to 54 inches tall. These bikes are readily hand built and ships straight to the customer. Assembling is essential to put on the seat, pedals, front wheels and to adjust the tires and pump up the tubes.

Mountain Bikes for Kids

Choosing The Best Mountain Bike for Kids


It is easy to it to buy a bike from the shop and hit the trails instantly, but there are some important specifications to consider in the best mountain bike to have the best value for the money spent. Let us discuss some important aspects to consider choosing a bike that rides smooth and efficient.

  • Leveraging on the right size and fit
  • Wheel size
  • Frame of the bikes
  • Fork
  • Tires
  • Gears
  • Brakes


Leveraging on the right size and fit:

Choosing the right model of the bike is important to help kids handle it confidently and enjoy their ride securely. There is an age and height recommendation for each bike; parents have to take such considerations into along with its components such as tires, frame, fork, brakes and gears.

It is important to choose the right size bike appropriate for the child’s age rather than to allow the child to grow to adapt to it. Parents should not force them into an unwieldly machine that is beyond their control.


Wheel Size:

The wheels of the bike determines its proportions, models meant for children have wheel diameters between 12 and 24 inches. The bike is said to be age appropriate if the little riders are able to stand across the frame, reach the pedals comfortably and grab the handle bars without having to over reach from the saddle.

If the child squirms in the seat while pedalling, then the saddle is said to be too high. The following is the wheel size for different age groups.

  • Ages 2-3 years – 12 inch wheels
  •  3-4 years – 14 inch wheels
  •  4-5 years – 16 inch wheels
  • 6-7 years – 20 inch wheels
  • Ages 8-10 years – 24 inch wheels
  • 12+ years – 26 inch wheels
  • Teenagers and adults: 26- 29 inch wheels


Frame of The Bikes:

The Frame is the largest part of the kid’s mountain bike as it adds to its overall mass. A bike that is heavy becomes unwieldy to push, hard to handle and also difficult to ride. Most bikes strike the perfect balance between weight and durability by using Aluminum alloys as its frame material.

Aluminum and its alloys have great flexibility to absorb bumps, are resistant to corrosion, is lightweight and affordable as well. Steel frames are strong but are heavy and is the metal of choice for kids bikes.



Parents have to make a choice between a rigid fork or suspension fork for a kid’s bike. Greater the suspension, smoother the ride and is ideal for kids involved in technical trails involving steep paths and bumpy patches.

For those who are happy with cross country riding, a rigid fork is sufficient and helps them ride over smooth paths. Bikes with rigid forks costs less weigh less and are free of maintenance than suspension forks.



The tires of children’s bike mandate stability and comfort. A wider tire means greater surface area and more contact with the ground. It also helps in encountering different types of terrains such as gravel, dirt paths, dust, and rocky trails and wed mud. The best manufacturers use decent tires on kid’s bikes that fit a lot of riding situations.



Mountain bikes with gears mandate kids to learn the fine notions of shifting and can be confusing as well. Having lots of gears, makes it easy to pedal uphill and sustain high speeds over time. Not knowing how to shift gears induces stress on the chain and makes it jump on the wheels.

The best and the most common configurations on the mountain bikes are a single gear in the front and a triple chain set in the front or at the rear. In these bikes, kids easily select the right gear and have a lot of options for different terrains.



Mountain brakes either use rim brakes or disc brakes. Rim brakes or linear brakes mandate children to pull the rubber brake pads that connect with the metal rim of the wheels. Disc brakes on the other hand have rotors mounted on the wheels along with special brake pads.

Pressure can be applied pneumatically or by hand. Disc brakes are superior technically and are a little over rated for child’s bike. Normal bikes are fine with regular brakes unless the child in involved in fast downhill paths and technical trails.


Kid’s Mountain Bikes Maintenance Guide:

Kid’s bikes are expensive and as they do not know to handle them properly, they can break down pretty easily. With the right care and regular maintenance, these bikes can last for years. Prompt maintenance not just keeps the bike running smoothly, but also makes it easy and safe to ride.

  • Bike Maintenance Before Each Ride
  • Bike Maintenance After Every Ride
  • Maintenance Every Few Months


Bike Maintenance Before Each Ride:

  • Brakes: both the brakes of the bike should be given a good squeeze and ensured that they are working properly. It is important to check if the brake pads clear the wheel rim and are not worn out.
  • Tires: Tires that are full of air are easier to ride. Parents have to check the tire pressure and add air if the tires feel very soft. The correct air and pressure level are written on the side of the tire.
  • Quick releases: This is a mechanism that allows the user to take the bike wheels off easily and quickly. If the kid’s bike has such a quick release mechanism, they have to be tightly secured.
  • Bolts: parents have to check for loose parts and bolts on the bike.
  • Bells and horn: parents have to check if the bell and horn are working and are loud enough for others to hear.
  • Lights: Parents have to check if all the lights are working and batteries are charged before each trail, especially if it requires driving in the night.


Bike Maintenance After Every Ride:

After every drive, the bike is to be given a wipe down to avoid it from getting rust or rot. It is important to clean the axles and keep the wheels spinning easily after riding in the sand. Parents have to lubricate the chain with chain oil to prevent rust and keep it running smoothly.


Maintenance Every Few Months:

Every few months the bike has to be given a good wash using soap and water. A tooth brush can be used to clean the dirt off the gears and the chains. After washing it is important to lubricate all the moving parts with oil, especially the chain.

The bike has to be given a thorough inspection to check if it is in a good and safe condition. Parents should check the frame for cracks, check the gears if they switch smoothly, check the brake pads, check if the handlebars align with the front forks and finally check if the seat pad is at the right height.



We hope our top mountain bikes for kid’s offers a variety of choices for different age groups and in diverse styles for our little companions. Our guide definitely helps you in picking up the right model for your little boys and girls.

Parents should choose the correct bike fit and size diligently depending on the type of mountain biking activity their kids primarily perform. Individual features of the bike should be given a careful consideration to choose the best fit bike depending on their size, age and skill level. We recommend that kids get gradually moved from their comfort zone to acquire new driving skills.


For more of our top gear recommendations, check out these popular outdoor gear guide links : Best Snowboard Goggles | Best Snowboarding Gloves | Best Snowboarding Jackets for Men | Best Women’s All Mountain Skis | Best Beach Cruiser Bicycles For Men and Women | Best Folding Bikes | Best Bike Headlights | Best Carbon Fiber Mountain Bikes | Best Hybrid Bikes for Men & Women

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