Choosing the Best 20 Inch Mountain Bike for Your Child: A Comprehensive Guide

Selecting the right 20 inch mountain bike for your child is crucial for their enjoyment and skill development on the trails. Unlike adult bikes, 20 inch mountain bikes require a different approach, focusing on lightweight design and child-appropriate components rather than simply scaling down adult features. Features like excessive suspension, dropper posts, and heavy cassettes that enhance adult bikes can actually hinder young, lighter riders on 20 inch bikes.

This guide will delve into the key aspects of choosing an exceptional 20″ MTB, tailored to your child’s ability, riding style, and your budget. Having rigorously tested over 50 different 20 inch bikes, we’ll outline the essential considerations when shopping for a 20 inch mountain bike and present our top recommendations across various price points.

Top 20 Inch Mountain Bikes: Our Recommendations

Bike Why It Stands Out MSRP
Entry-Level 20 Inch Mountain Bikes – Quality Geared Options for Basic Trails
Polygon Ultralight Unmatched lightness for under $300, shedding 4 lbs compared to competitors! $289
Prevelo Alpha Three Exceptionally agile, featuring a wide-ranging gear system $599
Rigid Trail Bikes for Intermediate Riders – Upgraded Shifters, Disc Brakes, 7+ Gears, Rigid Fork
Commencal Ramones 20 Superior components and geometry at this price point $540
Pello Rover Versatile performance both on and off the trails $589
woom OFF 4 The lightest legitimate MTB available! $849
Front Suspension Bikes for Advanced Riders – Trigger Shifters, Disc Brakes, 8+ Gears, Air Fork
woom OFF AIR 4 Ultra-lightweight MTB equipped with an air fork $1099
Prevelo Zulu Three Trail-ready geometry, 9 gears, and an 80mm fork for aggressive riding $1199
Trailcraft Blue Sky 20 Highly customizable, premium builds with exceptional lightweight design $1899
Bikes to Avoid for Serious Mountain Biking
REI REV 20 Plus Overweight and equipped with basic components $399
Specialized Riprock 20 Geometry that may be too aggressive for many young riders $600

IMPORTANT NOTE ON SIZING: While all bikes listed feature 20″ wheels, their overall size can vary significantly. Always verify the minimum seat height to ensure a proper fit. A good rule of thumb is that your child’s inseam should be 2″ to 3″ shorter than the bike’s minimum seat height for optimal fitting. Refer to our kids bike sizes guide for detailed fitting advice.

Entry-Level 20 Inch Mountain Bikes for Beginner Riders

For children new to mountain biking and sticking to basic trails, high-end components like suspension forks and hydraulic disc brakes aren’t necessary. In fact, for beginner riders, especially on 20 inch mountain bikes, a complex suspension fork may not function effectively due to their lighter weight. Similarly, the extreme stopping power of hydraulic disc brakes isn’t essential for lower speeds and gentler terrains.

For kids starting out on easy trails, the essential features to look for without overspending include:

  • A durable yet lightweight frame
  • Reliable dual handbrakes
  • User-friendly gears
  • Knobby tires for adequate traction

Budget Considerations: Invest as much as your budget allows, but avoid overspending on features that are not yet needed. For beginners on basic trails, any bike in this entry-level category will be a suitable starting point. While higher-priced bikes offer enhanced components and a better overall riding experience, a significant investment isn’t necessary to begin enjoying trail riding.

Best value under $350!

Polygon Premier Ultralight

$319 – $349

BEST FOR: Budget-conscious parents seeking a quality bike for kids new to single-track or mountain biking.

View on Ultralight Urban View on Ultralight MTB Our Review

Polygon Premier Ultralight Models Overview

The Polygon Premier Ultralight series comes in two variations: Urban and MTB. Both share the same lightweight frame and drivetrain, but differ in fork and tire configurations. The Urban model features a rigid fork with all-terrain tires, while the MTB version includes a suspension fork and wider, off-road tires.

Polygon’s Premier Ultralight bikes strike an ideal balance, offering the lightweight agility needed for young riders along with the robustness to confidently handle trails, even the Urban model.

Ultralight Urban **Ultralight MTB**
MSRP $299
Weight 21.1 lb.
Seat Height 21.25″ – 27.25″
Tire Width 1.75″
Max Tire Width 2.1″
Gearing 7 speed, grip
Cassette 14-28T
Brakes V-pull
Fork Rigid
Head Tube 69°
Seat Tube 72°

While the Urban model is designed for both pavement and light dirt trails, its lightweight construction and reliable brakes make it surprisingly capable on basic single-track. For frequent trail use, consider upgrading the Urban’s 1.75″ all-terrain tires to 2.0″ knobby off-road tires.

For children immediately ready to tackle trails, the Mountain Bike (MTB) model is equipped with 2.0″ knobby tires and a 40mm Suntour coil fork. These upgrades enhance off-road capability but add a slight weight increase.

For more aggressive riders or larger children, the added weight of the MTB model may be justified. However, for smaller or more cautious riders, the rigid Urban model with upgraded tires like these might be a better choice.

Lightweight and nimble!

Prevelo Alpha Three

$599

BEST FOR: Beginner to intermediate mountain bikers seeking a lightweight and highly maneuverable bike. For more challenging terrain, upgrading to Prevelo’s wide trail tires is recommended.

View on Prevelo Our Review

Prevelo Alpha Series Highlights

The Prevelo Alpha Three excels as an entry-level mountain bike for young riders on basic trails, despite being designed as an all-purpose bike. Its exceptional lightweight and nimble handling quickly build confidence in new trail riders.

Prevelo Alpha Three
MSRP
Weight
Seat Height
Tire Width
Max Tire Width
Gearing
Cassette
Brakes
Fork
Head Tube
Seat Tube

Featuring a low center of gravity frame and a wide 560mm handlebar, the Alpha delivers smooth and controlled cornering. It offers ample climbing power with an 8-speed gear system and a wide gear ratio range, ideal for tackling varied terrains. The Microshift trigger shifter is specifically designed for smaller hands, making gear changes easy and intuitive.

Recent updates have enhanced the Alpha’s versatility, now accommodating tires up to 2.1″ wide. This upgrade is beneficial as wider tires can provide improved cushioning and traction as riders progress in their mountain biking skills.

20 Inch Mountain Bikes for Intermediate and Advanced Riders

For young riders tackling intermediate blue trails and beyond, a more advanced 20 inch mountain bike can significantly enhance their trail experience, boost performance, and improve safety.

Key differentiators between beginner and intermediate/advanced bikes include:

(1) More aggressive geometry (slacker head tube angles)
(2) Wide, cushioning tires
(3) Powerful and responsive disc brakes
(4) Optional suspension fork

The ideal bike depends on your child’s specific riding style and terrain. For downhill-focused riding with shuttles or lifts, the added weight of a suspension fork can be a worthwhile trade-off. Conversely, for riders who prioritize climbing, a lighter rigid bike will be more efficient.

Consider your child’s primary riding complaint. If climbing is a struggle, a lightweight rigid bike with a less slack head tube angle will aid in their climbing development. If they experience discomfort from bumps and vibrations, a quality suspension fork might be the better choice.

Geometry is also crucial. The Prevelo Zulu, with a slack 66° head tube angle, offers excellent downhill stability, while the Pello Rover, with a 69.5° head tube angle, excels in climbing efficiency. For areas with significant elevation changes, prioritizing uphill performance might be more beneficial.

Quality at a great price!

Commencal Ramones 20

$540

BEST FOR: Young mountain bike enthusiasts on a mid-range budget ready for true single-track adventures.

View on Ready, Set, Pedal Our 24″ Review

Commencal Ramones Overview

The Commencal Ramones 20 is a trail-ready mountain bike that provides excellent value. Equipped with mechanical disc brakes, proper MTB geometry, and wide knobby tires, it’s a top pick for families seeking performance on a budget.

Commencal Ramones 20
MSRP
Weight
Seat Height
Tire Width
Max Tire Width
Gearing
Cassette
Brakes
Fork
Head Tube
Seat Tube

At this price point, the Ramones stands out for its lighter weight compared to other bikes in its category. For young riders, a few pounds can make a significant difference, especially when tackling uphill climbs.

Lightweight and nimble!

woom OFF and OFF AIR

$849 – $1,099

BEST FOR: Serious young riders on a mid-range budget ready for challenging single-track trails.

View on woom OFF Review OFF AIR Review

woom OFF and OFF AIR Features

The primary difference between the woom OFF and OFF AIR models is the suspension fork. The OFF AIR features an air suspension fork specifically designed for lightweight children, offering 60mm of travel with adjustable rebound and lockout. The woom air fork can also be purchased separately as an upgrade for the standard OFF model.

OFF 4 OFF AIR 4
MSRP $849
Weight 18.5 lb.
Seat Height 22.8″ – 28.7″
Tire Width 2.35″
Gearing 9 speed, SRAM trigger
Brakes Hydraulic disc
Fork Rigid
Head Tube 68°
Seat Tube 70°

If budget is not a constraint, the woom OFF 4 is highly recommended as an excellent starting mountain bike for young groms, particularly for those tackling hills. For 4 to 7-year-olds on 20 inch mountain bikes, bike weight is paramount. A lighter bike works more effectively with their smaller bodies.

For instance, a 22-pound bike, while light for an adult, represents 44% of a 50-pound child’s weight. The woom OFF, at 18.5 pounds, reduces this to 37%. This weight difference is significant, especially on climbs, considering the limited stamina of young children.

Beyond its lightweight design, the woom OFF boasts hydraulic disc brakes, SRAM trigger shifters, and 2.25″ wide, cushioning off-road tires, making it a complete package for beginner to intermediate riders to develop their skills.

Consider upgrading to the woom OFF AIR if your child enjoys jumps or you frequently ride lift-assisted or shuttle trails. While the suspension fork adds 2.5 pounds, it’s worthwhile if more time is spent descending. For those seeking an even lighter hardtail 20 inch bike, the Trailcraft Blue Sky 20 is the only lighter option.

For enhanced cushioning on rough trails, lowering tire pressure can offer a similar benefit to front suspension, without the added weight and cost.

Lightweight and versatile!

Pello Rover

$849 – $1,099

BEST FOR: Versatile performance for young riders on a mid-range budget ready for diverse single-track trails.

View on Pello Our Review

Pello Rover Features

The Pello Rover is available with or without a suspension fork. Opting for the suspension version includes the rigid fork as well, providing flexibility. You can choose to have the Rover shipped with either fork installed.

However, the Rover’s optional suspension fork is coil-based and less responsive than an air fork. For riders who truly need suspension, investing in the woom OFF AIR with its superior air fork might be a better long-term choice.

Rover Rover w/ Suspension
MSRP $589
Weight 19.9 lb.
Seat Height 22.5″ – 27.5
Tire Width 1.95″
Max Tire Width 2.1″ front, 1.95″ rear
Gearing 7 speed, SRAM trigger
Cassette 11-34T
Brakes Mechanical disc
Fork Rigid
Head Tube 69.5°
Seat Tube 72°

The Rover strikes a balance as a “goldilocks” 20 inch mountain bike, providing the right level of technical components for advancing intermediate riders. Standard features include a lightweight frame with a low center of gravity, trigger shifters, and mechanical disc brakes—essential for tackling blue trails without unnecessary premium costs. The Rover’s reasonable price further enhances its appeal.

As your child progresses, the Rover can adapt. Upgrades like a suspension fork and wider 2.1″ knobby mountain bike tires can be added for enhanced traction and cushioning beyond the standard 1.95″ all-terrain tires.

However, for riders focused on downhill performance, the slacker head tube angles offered by bikes like the woom OFF and Zulu may provide superior downhill stability.

Best overall!

Prevelo Zulu Three

$1,199

BEST FOR: Young, skilled riders tackling true single-track, especially those encountering significant elevation changes. Its low gear range excels on climbs.

View on Prevelo Our Review

Prevelo Zulu Series Details

The Prevelo Zulu Three, updated for 2024, is an even more impressive all-mountain 20 inch bike.

Zulu Three
MSRP
Weight
Seat Height
Tire Width
Gearing
Brakes
Fork
Head Tube
Seat Tube

For young riders ready to confidently take on challenging intermediate trails, the Prevelo Zulu Three is an outstanding choice. It’s designed as a true all-mountain 20″ kids’ bike, meticulously engineered for downhill performance.

Featuring a 66° head tube angle, an 882mm wheelbase, 80mm of travel with an adjustable air suspension fork, hydraulic disc brakes, and dropper post compatibility, the Zulu delivers exceptional downhill capability. It handles everything from rocky terrain to jump lines with confidence and stability.

For uphill and varied terrain riding, the Zulu’s steeper seat tube angle positions the rider optimally over the pedals, maximizing pedaling efficiency and power transfer.

The 2024 Zulu model has been significantly lightened, now weighing just 20.5 pounds without pedals, only slightly heavier than the woom OFF AIR!

Most customizable!

Trailcraft Blue Sky 20

$999+

BEST FOR: Established young riders seeking a highly customized bike. Gearing and suspension components are all customizable.

View on Trailcraft Our Review

Trailcraft Blue Sky Series Overview

The Trailcraft Blue Sky 20 is offered in two models: the standard Special and the upgraded Pro. The Pro version is approximately 1.5 pounds lighter and features even higher-end components.

Blue Sky Special Blue Sky Pro
MSRP Varies
Weight 20.5 lb.
Seat Height 23″ – 28.6″
Tire Width 2.2″ tubeless ready
Gearing 10-speed, Microshift trigger
Brakes Hydraulic disc
Fork Air w/ 80mm travel, adjustable rebound
Head Tube 68°
Seat Tube 73°

The premium price of Trailcraft bikes reflects their exceptionally low weight and extensive customization options. The value of these features depends on individual priorities.

The Pro build of the Blue Sky is two pounds lighter than the woom OFF AIR. While seemingly minimal, this weight difference is noticeable for young climbers, positively impacting their motivation and endurance. Our 5.5-year-old aggressive tester experienced a tangible benefit from this reduced weight.

Trailcraft excels in component customization. Beyond chainring size, drivetrain, and brake component choices, all Blue Sky models are tubeless-ready and can be shipped pre-converted. Dropper post compatibility is also standard.

For highly specific build requirements, Trailcraft offers further customization beyond their standard options, providing a bespoke bike-building experience due to their small, custom shop approach.

20 Inch Mountain Bikes to Consider

While not making our top recommendations, these bikes are still worthy of consideration.

Super aggressive geometry!

Specialized Riprock 20

$600

BEST FOR: Aggressive young riders who fit its unique geometry.

View on Specialized Our Review

Specialized Riprock Overview

The Specialized Riprock 20 is designed for speed, fun, and ambitious riding, appealing to very aggressive young riders. It features impressive components, including hydraulic disc brakes, trigger shifters, and wide 2.35″ cushioning tires. However, its highly aggressive geometry presents a fitting challenge for many children.

The Riprock 20’s low stack height, extra-wide handlebars, minimal-rise stem, and high seat placement create a narrow fit window. Geometry adjustments in future models could broaden its appeal, but currently, recommendation is cautious. Read our detailed review for a comprehensive understanding of its geometry and performance.

Specialized Riprock
MSRP
Weight
Seat Height
Tire Width
Max Tire Width
Gearing
Brakes
Fork
Head Tube Angle
Seat Tube Angle

For those aggressive riders who do fit the Riprock’s geometry, it promises an exhilarating ride. Even without suspension, the Specialized Ground Control tires, when properly inflated, offer significant cushioning and traction for challenging trails and small drops.

Heavy!

REI Co-Op REV Plus 20

$399

BEST FOR: Casual riding and light trails, but not ideal for serious mountain biking due to weight.

View on REI Our Review

REI Co-Op REV Plus Overview

The REI Co-Op REV Plus 20 is a bike we appreciate for many reasons but find less suitable for true mountain biking. Despite its appealing mid-fat tires and mountain bike aesthetics, its significant weight of 25 pounds (without suspension) is a major drawback.

While mountain biking is possible on the REV Plus 20, its weight makes it less efficient and enjoyable compared to lighter options. For a similar budget, the Polygon Ultralight (20.75 pounds) offers a lighter alternative. Spending a bit more for the Prevelo Alpha Three (19.1 pounds) or Commencal Ramones 20 (23.5 pounds) provides trigger shifters and further weight reduction, significantly enhancing the riding experience.

What to Look For When Choosing a 20 Inch Mountain Bike

20 inch mountain bikes are unique, bridging the gap between typical kids’ bikes and performance-oriented adult bikes. Simply downsizing adult mountain bike features is not effective for children due to different body proportions and significantly lower body weight. Weight is a critical factor in the performance and usability of a 20 inch mountain bike.

While adult mountain bikes benefit from numerous features, even with added weight, the opposite is often true for smaller bikes. Lightweight construction is paramount, and component choices, such as suspension forks and dropper posts, should be carefully considered to avoid unnecessary weight gain.

Let’s explore the essential components and features to consider when selecting a 20 inch mountain bike for your child, from tires to brakes.

Weight Matters

For young trail riders, a lightweight bike is essential. While experienced, heavier riders can manage heavier bikes, most children on 20 inch mountain bikes lack the strength and experience for heavier rigs. Therefore, lightweight, basic trail bikes are often more beneficial for beginners than advanced, feature-heavy models.

For example, a 24-pound bike represents a significant 48% of a 50-pound child’s weight. In our testing, the heavy REI Co-Op Plus, despite wide tires and disc brakes, proved less practical on longer trails with climbs. In contrast, the lighter 19-pound Prevelo Alpha, even with narrower tires and V-brakes, performed much better on the same trails.

Even if your goal is for your child to tackle challenging trails on a mini-enduro style 20-inch bike, starting with a lightweight, simpler bike is highly recommended. This approach aids in skill development and ensures they are truly ready for a more aggressive and expensive upgrade later.

Tire Choice

1.5″ all-terrain tire vs. 2.1″ off-road tire

The ideal tire for your child’s 20 inch mountain bike depends on the riding terrain. While wider, off-road tires are generally better for mountain biking, they are not always the best choice for every rider in every situation.

Beginner riders often perform well with quality all-terrain tires like the Kenda Small Block 8, featured on the Prevelo Alpha and Polygon Ultralight. Our testers have successfully completed mountain bike classes using Small Block 8s without issues. Their lower rolling resistance and lighter weight enhance agility on climbs, while still providing sufficient downhill traction.

However, for riders progressing to more aggressive cornering and rougher trails, the added cushioning of wider, beefier tires becomes invaluable. Lowering the PSI in wider tires on a 20″ MTB can effectively mimic the cushioning of a suspension fork.

For rapidly growing children, transitioning to a larger 24″ bike might be the next step. For smaller riders remaining on 20″ bikes, upgrading to wider, knobby tires, such as 1.9″ Schwalbe Black Jacks, can significantly improve performance on more challenging terrain.

Suspension Fork: To Suspend or Not to Suspend?

Contrary to popular belief, we’ve found that most children on 20 inch mountain bikes are better served by a rigid bike than one with suspension. The added weight of a suspension fork often outweighs its benefits for this age group.

Children on 20 inch bikes are lightweight, requiring finely-tuned, often expensive, suspension forks to respond effectively to their minimal weight. In the past, functional suspension forks for 20 inch bikes were rare; many were primarily cosmetic.

Suspension vs. Rigid Fork

Recently, higher-quality suspension forks designed for young riders have emerged, but they come at a premium cost. In most scenarios, investing in a lightweight rigid bike equipped with wider, cushioning tires (run at lower PSI) is more advantageous than spending the same amount on a heavier bike with front suspension.

Reasons to Choose a 20 Inch Mountain Bike with Suspension:

  1. Your child experiences hand or arm numbness on long rides over rough terrain.
  2. Wider 2.1″+ tires at low PSI cannot be fitted (especially on the front). Wide, cushioning tires often provide similar cushioning to suspension forks on 20″ MTBs.
  3. Riding is predominantly downhill (shuttle runs, lift-assisted, tow ropes).
  4. AND you have the budget for a high-end bike ($900+) with a quality suspension fork.

Reasons to Avoid Suspension on a 20 Inch Mountain Bike:

  1. You assume it’s necessary without observing a specific need in your child’s riding.
  2. Primarily for aesthetic reasons.

If unsure about suspension needs, consider the woom OFF or the more affordable Pello Rover. The Pello Rover with suspension includes both suspension and rigid forks, allowing you to start with the rigid fork and transition to suspension as needed. However, note that the Rover’s suspension fork is coil-based and less responsive than the air fork on the woom OFF AIR.

While the woom OFF AIR doesn’t include a rigid fork, the woom OFF suspension fork can be purchased separately for a future upgrade.

Gears vs. Single Speed

Unless your riding is limited to neighborhood dirt paths, basic downhill runs, or pump tracks, gears are essential for a 20 inch mountain bike.

A minimum of 6 gears is recommended for true trail riding. For terrains with significant elevation changes, a wider gear range is preferable. Regardless of gear count, a tow rope is highly recommended for any mountain biking family, useful for steep climbs and assisting tired children.

Trigger vs. Grip Shifters

For aggressive mountain biking, trigger shifters are superior. They allow for quicker gear changes and prevent accidental handlebar twisting during shifting.

While many bikes come with grip shifters, upgrading to trigger shifters is often straightforward. You’ll need a trigger shifter set compatible with your bike’s gear count, such as this 7-speed trigger shifter, and new grips. This bike mechanic video provides a helpful guide for the conversion process.

Initially, trigger shifters can be slightly more complex for younger children to learn. Using colored stickers on the levers can aid in teaching. Ride behind your child and instruct them to shift by calling out the color of the lever to press.

Brakes: Disc Brakes Necessary?

Reliable, high-performance brakes with ample stopping power are crucial for all mountain bikes. For basic green trails, high-quality v-pull brakes are adequate. As your child progresses to intermediate blue trails, disc brakes become a worthwhile consideration for enhanced stopping power.

Hydraulic disc brakes are top-tier, offering excellent modulation and reduced hand fatigue. Mechanical disc brakes provide more stopping power than v-pull rim brakes but lack the modulation of hydraulic systems.

Upgrading from mechanical to hydraulic disc brakes is relatively easy, but upgrading from v-pull brakes to disc brakes is generally not feasible.

Geometry Considerations

The ideal geometry for a 20 inch mountain bike depends largely on the amount of climbing involved in your typical rides. 20 inch bike riders are in a transitional phase—they are past needing constant towing like 16″ bike riders, but still lack the stamina of older kids on 24″ bikes.

While towing is sometimes necessary and helpful, you also want to encourage climbing skill development and build endurance. For most children, 20 inch mountain bikes with head tube angles between 68° and 70° offer an optimal balance.

Slacker bikes (66° – 67° head tubes) designed for downhill excel for experienced young riders focused on downhill performance and those who frequent shuttled or lift-assisted rides.

Pello Rover (69° HTA) vs. Prevelo Zulu Three (66° HTA)

Head Tube Angle (HTA) Explained: The head tube angle determines the front tire’s position relative to the bike. A slacker angle positions the tire further forward, enhancing downhill stability. A steeper angle brings the tire closer, improving climbing efficiency.

For 20 inch mountain bikes, “slack” angles differ from adult bikes due to the challenge of fitting smaller bodies onto modern geometry. The slackest HTA among kids’ brands like Spawn, Trailcraft, Specialized, Commencal, Prevelo, and woom is 66° (Prevelo Zulu). 68° is common, while “all-around” bikes often range from 69° to 70°.

We favor slightly steeper head tube angles for 20 inch mountain bikes because they facilitate easier climbing. Slacker angles can reduce weight on the front wheel during steep climbs, potentially causing tire slippage if the rider doesn’t consciously lean forward.

Steeper head tube angles automatically position more of the child’s weight over the front tire, aiding in maintaining traction during climbs, which is beneficial for young riders still developing their balance and weight management skills.

Gender-Neutral Design of 20 Inch Mountain Bikes

Baby Ripper Wearing SHREDLY Littles Collection

Are there specific 20 inch mountain bikes designed for girls versus boys? No. Kids’ mountain bikes are universally gender-neutral. Skill level and weight are more relevant factors than gender when selecting a bike. Some brands offer color options that might be considered more traditionally feminine, such as pink or purple.

Personalizing the bike with gear like SHREDLY MTB apparel for girls is another way to add a personal touch.

This comprehensive guide should equip you with the knowledge to choose the best 20 inch mountain bike for your young rider, ensuring they have a safe, enjoyable, and skill-enhancing experience on the trails.


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