Best BMX Bikes for Kids: 8 Picks Compared

Our verdict

Our Top Picks

A kid’s BMX bike has to fit before it can be fun. The eight bikes here differ most in wheel size, rider height range and brakes, so this guide compares eight Amazon-stocked options by who they fit: 18-inch bikes that their makers size from about 3’4″ to 4’10”, 20-inch bikes that their makers size from about 4’6″ up (Dan’s Comp’s chart starts 20-inch wheels at 4’8″), and one 24-inch bike for tall kids who mostly cruise. Measure your child against these ranges before you choose. Where a maker publishes a height range, the range below is the maker’s own figure, and where the maker’s own pages and listings disagree we say so.

Compare the picks

Compare the 8 Kids’ BMX Bikes

Fits rider is the maker’s height range (or age range, where no height is published) for the exact size we link. Weight is the figure on the Amazon listing unless the maker publishes one, except for the Tony Hawk 720, whose listing we treat as unconfirmed because it contradicts Dynacraft’s page on the brakes; “not published” means neither gives a figure.

What Size BMX Does Your Kid Need?

Measure your child’s height in socks before you look at ages. BMX sizing runs by height and wheel size, and the makers’ own ranges are wide. As a cross-check, the freestyle sizing chart from BMX retailer Dan’s Comp puts riders on these wheel sizes:

Rider height	Wheel size (Dan’s Comp freestyle chart)
3’2″ to 4’0″	16 in
3’10” to 4’8″	18 in
4’8″ to 5’2″	20 in (18.5–20 in top tube)
5’0″ and up	20 in (20 in top tube and longer)

The American Academy of Pediatrics is blunt about “growing into it”: on HealthyChildren.org it calls oversized bikes “especially dangerous” and says a child “should be able to sit on the seat, with hands on the handlebars, and place the balls of both feet on the ground.” Use that as the test once the bike arrives. The r/bmx commenters we read reached the same place: one told a parent of an 8-year-old that “a 20″ wheel bmx is quite big for a 8yr old,” and a reply in the thread reads “I got an 18″” (thread).

So what age is a 20-inch BMX bike for? Makers’ answers vary: RoyalBaby lists its 20-inch for ages 7–12, Dynacraft for 6–10, Mongoose’s Legion Mag from 4’6″ tall (its Amazon listing says 4’8″), and Elite’s Amazon listing says its 20-inch is “suitable for 11+-year-old (4ft to 5ft 10″)”. Dan’s Comp’s chart starts 20-inch wheels at 4’8″. Go by height, and pick the smaller size if your child is between two.

If your child is under about 3’8″ (below the Legion L18’s range), check the Switch (from 3’6″) or the Elite Pee Wee 18 (from 3’4″), or look at a 16-inch; Dan’s Comp’s chart starts 18-inch wheels at 3’10”. Bicycling’s “Best for Kids” BMX, the Mongoose Legion L16, is one, for riders 3’6″ and under, but we did not find it stocked on Amazon; true 16-inch BMX bikes from BMX brands (Kink, Cult, Sunday and others) are sold through BMX shops, and we did not find those stocked on Amazon; see our bikes for 5-year-olds for regular pedal bikes in that size.

How We Chose These Kids’ BMX Bikes

What we compared

• Fit for the size we link: the maker’s rider height range for that exact wheel size, cross-checked against Dan’s Comp’s freestyle chart.
• Brakes a child can use: hand brakes, coaster brakes or both, and where the maker’s own pages disagree.
• Weight: a heavy bike is harder for a light rider to lift, hop and steer; we list the published weight and say whose figure it is.
• Crank and bearings: whether the bike has the 3-piece crank and integrated headset that one r/bmx commenter names as a trick bike’s minimum, or the 1-piece crank and loose-ball bearings of most budget picks here.
• Stocked on Amazon: each pick was in stock and new on Amazon when we checked, sold by Amazon, the brand, or a third-party seller we name in its review.

Sources and what each pick rests on and what BMX parents on Reddit keep saying

Sources and what each pick rests on

Specs come from each maker’s product page (Mongoose, Elite BMX and Dynacraft), with weights, rider-weight limits and warranties from the Amazon listings where the maker’s page gives none; each figure says whose it is. For RoyalBaby and cubsala, which publish no spec sheet of their own for these models that we could find, the specs come from the brand’s Amazon listing. Each review’s Evidence line says what the recommendation rests on. One pick has an independent editorial source, Bicycling, which named the Mongoose Legion L16 its “Best for Kids” BMX; that is a smaller, earlier Legion, so it supports the series, not the exact bike. The other seven rest on maker specs, with r/bmx commenters’ views quoted as context where we found them.

What BMX parents on Reddit keep saying

We read the r/bmx threads that rank for this search and the parent threads they link. Four points recur:

• Size down, usually. Most commenters steered a parent of a 4’6″ 8-year-old to an 18-inch (thread), though after talking to Dan’s Comp and a BMX shop, both of which advised against an 18-inch, that parent bought a 20-inch with a 20-inch top tube, “a little big now” in their words. The AAP advises against buying big, so fit the bike to the child.
• Weight matters. “Weight and bike size is crazy important for these weak groms,” one rider wrote in the same thread.
• Know what a budget BMX is. The minimum features one commenter names for a trick bike are “a 3-piece crank, integrated headset, and mid bottom bracket.” Four of the five picks that publish a crank type have 1-piece cranks, and the Legion L18 and L10 spec lists show loose-ball bottom brackets: fine for riding around and first hops, less so for a child who gets serious about the skatepark.
• The brands r/bmx recommends are mostly not on Amazon. Kink (Kicker, Curb), Cult (Juvenile), Sunday, WeThePeople and Fit came up in the threads we read; we found none of them stocked on Amazon, so they are not picks here.

Detailed Reviews

Mongoose Legion L18, Top Pick, 18-Inch

Evidence: Independently reviewed, same series. Bicycling: Legion L16, 16 in, earlier model year.

Mongoose built the Legion L18 (model year 2026 on the Amazon listing) around 18-inch wheels with “scaled-down components to fit younger riders,” and lists it for riders from 3’8″ to 4’10”. That window covers the 18-inch band in Dan’s Comp’s chart (3’10” to 4’8″) with room at both ends. The bar is 26 inches wide with a 6.5-inch rise, narrower and lower than the 28.25-inch bar on the 20-inch Legion L10, and the Amazon listing puts the bike at 23.2 lb, the lightest confirmed weight among our picks (the Tony Hawk 720’s listing weight is unconfirmed).

Bicycling named the smaller Legion L16 its “Best for Kids” BMX and noted that “Mongoose also sells the Legion 18 for children between 3-feet-8-inches to 4-feet-8-inches” (Mongoose now lists 4’10”). That was an earlier model year and the 16-inch size, so it speaks for the series, not this exact bike. Bicycling also called the L16 “heavy, even for a BMX bike” and passed on owner advice to replace the seatpost and brakes. The current L18 keeps the budget parts that go with its price: a 1-piece steel crank, a loose-ball bottom bracket and single-wall rims, per Mongoose’s spec list.

Specs (linked: Legion L18, 18 in, white, model M4126G27U1OS11)

• Fits rider: 3’8″–4’10” (Mongoose)
• Frame: hi-ten steel; fork hi-ten steel
• Tires: 18 x 2.3 in
• Brake: U-brake
• Crank: 1-piece forged steel, 32T; American loose-ball bottom bracket
• Handlebar: 26 in wide, 6.5 in rise
• Weight: 23.2 lb (Amazon listing); max rider weight 100 lb (Amazon listing)
• Warranty: limited lifetime on frame, 1 year on parts (Amazon listing)
• Price tier: $

RoyalBaby BMX Freestyle, Lightweight Aluminum 20-Inch

Evidence: No independent test; maker specs. Source: RoyalBaby’s Amazon listing (no maker spec page found).

RoyalBaby sells this BMX (a BMX model, not RoyalBaby’s 14- and 16-inch Freestyle kids’ bikes; model year 2026 on the listing) in a carbon-steel and a 6061 aluminum version; we link the aluminum one (model RB20-BMX1S). RoyalBaby’s listing gives 27.3 lb for it against 29.3 lb for the steel 20-inch, the lowest confirmed weight of the 20-inch picks here (Dynacraft publishes none for the Tony Hawk 720, and its Amazon figure is unconfirmed). RoyalBaby says the aluminum version has sealed bearings, and that every version arrives “95% built” with an included tool kit.

RoyalBaby lists the 20-inch for ages 7–12 and publishes no height range, so check your child against Dan’s Comp’s chart and the AAP’s seated fit test (on the saddle, hands on the bars, balls of both feet on the ground) before you order. We found no independent review of this BMX line. Two Wheeling Tots criticised the sizing of RoyalBaby’s separate Freestyle 14- and 16-inch bikes; that is a different line, but it is one more reason to check fit yourself rather than go by the age label.

Specs (linked: RoyalBaby BMX Freestyle, 20 in, Moonlight Silver aluminum, model RB20-BMX1S)

• Fits rider: ages 7–12 (RoyalBaby); height range not published
• Frame: 6061 aluminum
• Tires: 20 in, 2.35 in wide (Amazon listing)
• Brake: U-brake (Amazon listing)
• Gearing: 36T/16T
• Extras: 2 pegs, kickstand, sealed bearings (aluminum model only)
• Weight: 27.3 lb (Amazon listing)
• Warranty: frame covered for the original owner (RoyalBaby, Amazon listing)
• Price tier: $$

Mongoose Legion Mag, Best With Four Pegs

Evidence: No independent test; maker specs. Source: Mongoose product page.

Mongoose’s product page lists the Legion Mag for riders from 4’6″ to 6’0″; the Amazon listing gives a minimum rider height of 56 inches (4’8″). By the product pages it starts lower than the L10 (5’3″), though the L10’s Amazon listing says otherwise (see review 7). It comes with four pegs, a brake-cable rotor for barspins, and aluminum mag wheels with sealed bearings, under a hi-ten steel frame and a 170 mm one-piece crank. The Amazon listing gives 32 lb, the heaviest confirmed weight in this guide, which matters for a light rider.

Check the brakes on the listing before you buy: Mongoose’s own page lists an “Alloy rear U-brake” in its specifications but describes “Front and rear alloy caliper hand brakes” in its feature text. Amazon’s listing says rear U-brake. An r/bmx parent who compared it with the Legion L20 was told it is “pretty much the same bike with different wheels“, a commenter’s opinion about earlier model years.

Specs (linked: Legion Mag, 20 in, orange, model M41707M70OS)

• Fits rider: 4’6″–6’0″ (Mongoose product page); from 4’8″ (Amazon listing)
• Frame: hi-ten steel, one size; steel fork
• Wheels: aluminum mag with sealed bearings; 20 in tires
• Brake: rear U-brake (Mongoose spec list; its feature text mentions front and rear calipers)
• Crank: 1-piece forged steel, 170 mm
• Extras: four pegs, brake rotor
• Weight: 32 lb (Amazon listing); max rider weight 250 lb (Amazon listing)
• Warranty: limited lifetime (Amazon listing)
• Price tier: $$

Elite BMX Pee Wee 18, Best-Equipped 18-Inch

Evidence: No independent test; maker specs. Source: Elite BMX spec sheet.

Elite’s spec sheet for the Pee Wee 18 reads like a step up from the other kids’ bikes in this guide: a 3-piece Cr-Mo crank on a sealed spline bottom bracket, a sealed integrated headset, a Cr-Mo fork, 4-piece Cr-Mo bars, double-wall rims on sealed hubs and a Tektro U-brake. That covers two of the three features one r/bmx commenter calls the minimum for a trick bike (3-piece crank, integrated headset); Elite doesn’t say whether the bottom bracket is a mid size. Elite gives 27 lb for the complete bike.

Two cautions. The cranks are 170 mm, longer than the 145–165 mm that Dan’s Comp’s race sizing guide suggests for riders up to about 4’6″, and Elite sizes this bike for 3’4″ to 4’4″ on its Amazon listing, so check the fit with your child on the bike. And r/bmx is not kind to the brand: in a thread about Elite’s 20-inch Stealth, one commenter called it “as low end as you can go on a BMX bike,” and others preferred a Mongoose (thread); that is a different, cheaper Elite model. It is sold by Innovative Sports, Inc., which appears to be Elite’s own distributor (Elite’s customer-service email uses the isdist.net domain), and Elite says assembly by anyone other than a certified bike technician may void the warranty.

Specs (linked: Elite BMX Pee Wee 18, 18 in, Black Combat)

• Fits rider: 3’4″–4’4″, ages 5–7 (Elite, Amazon listing)
• Frame: hi-tensile steel; fork Cr-Mo
• Crank: 3-piece Cr-Mo, 170 mm; sealed 48T spline bottom bracket
• Wheels: double-wall rims, sealed hubs, 9T driver; tires 18 x 2.4 in
• Brake: Tektro alloy U-brake
• Bars: 4-piece Cr-Mo, 8.75 in rise
• Weight: 27 lb (Elite)
• Warranty: 1 year, frame and fork only (Amazon listing)
• Price tier: $$$

Dynacraft Tony Hawk 720, Budget 20 With Two Hand Brakes

Evidence: No independent test; maker specs. Source: Dynacraft product page.

Dynacraft describes the 20-inch Tony Hawk 720 as having “custom front and rear caliper brakes, a freestyle handlebar rotor, and front and rear foot pegs,” plus a full chainguard, and calls it “a perfect option for boys ages 6-10.” Two hand brakes give a rider who has outgrown a coaster brake a front and a rear lever. Dynacraft publishes no height range or weight; the Amazon listing gives 19 lb and mentions a coaster brake, which the maker’s page does not, so we treat both as unconfirmed. With no height range, check your child against Dan’s Comp’s chart before ordering.

On r/bmx, a used, earlier-model 24-inch Tony Hawk 720 drew a frank verdict: “this is a wal mart bike dont let the tony hawk name fool you,” while another commenter said the reviews they had read called it “a pretty decent bmx cruiser” (thread). Buy it for cruising and pegs, not for a child who wants to learn serious tricks.

Specs (linked: Dynacraft Tony Hawk 720, 20 in, teal, model 8114-84)

• Fits rider: ages 6–10 (Dynacraft); height range not published
• Brakes: front and rear caliper (Dynacraft)
• Extras: handlebar rotor, front and rear pegs, full chainguard (Dynacraft)
• Frame: steel (Amazon listing)
• Weight: not published by Dynacraft (Amazon listing says 19 lb, unconfirmed)
• Max rider weight: 220 lb (Amazon listing)
• Warranty: 1 year limited (Amazon listing)
• Price tier: $

Mongoose Switch, First BMX-Style Bike

Evidence: No independent test; maker specs. Source: Mongoose product page.

The Switch is a kids’ sidewalk bike with BMX looks: a low stand-over steel frame, pegs, a 4-piece handlebar and removable training wheels. Mongoose lists it for riders from 3’6″ to 4’4″, and its tool-free seat adjustment “fits riders 42–52″ tall.” It stops with a coaster brake (pedal backward) plus a rear hand brake to learn on. That matches the AAP’s advice that a first bike should have foot brakes, because young children’s “hand muscles and coordination are not mature enough to control hand brakes.”

This is not a skatepark bike: steel rims, 1.95-inch tires and a 27 lb weight (Amazon listing) are built for learning, not jumping. Once your child rides without training wheels and wants to hop curbs, the Legion L18 is the step up.

Specs (linked: Mongoose Switch, 18 in, black, model R1840AZ)

• Fits rider: 3’6″–4’4″ (Mongoose)
• Frame: steel, 7 in kids frame; rigid steel fork
• Tires: 18 x 1.95 in on steel rims
• Brakes: rear coaster and rear caliper hand brake
• Crank: 1-piece steel
• Extras: removable training wheels, pegs, chainguard
• Weight: 27 lb (Amazon listing); max rider weight 160 lb (Amazon listing)
• Warranty: limited lifetime (Amazon listing)
• Price tier: $

Mongoose Legion L10, For Taller Kids and Teens

Evidence: No independent test; maker specs. Source: Mongoose product page.

The 2026 Legion L10 is a full-size 20-inch freestyle bike with a 28.25-inch bar, an 8.25-inch rise, 20 x 2.35-inch tires, a 9T rear hub and an aluminum U-brake. The fit is the catch. Mongoose’s product page shows “5′ 3″ – 6′ 0″” for this exact model (M4136G27U1OS11), while the Amazon listing for the same model says “Designed for riders 4’0″ to 5’0″ tall.” The full-size bar and Mongoose’s own “first full-size BMX” tagline fit the page’s 5’3″ figure, and Dan’s Comp puts a full-size 20-inch top tube at 5’0″ and up, so we treat this as a bike for taller kids and young teens.

An r/bmx rider’s view of an earlier L10 sums up the trade: “1 piece cranks, unsealed hubs, 20inch top tube,” and also “a huge step up from no bike” (thread). Mongoose’s current spec lists a sealed-bearing cassette rear hub; the front hub is still a ball-bearing hub. The Amazon listing gives 28.6 lb and a 200 lb rider limit. Against the Legion Mag (#3), same line: lighter by the Amazon listings (28.6 vs 32 lb), with a full-size bar and 9T hub, but no pegs or rotor listed, and Mongoose’s page starts it at 5’3″ rather than 4’6″.

Specs (linked: Legion L10, 20 in, red, model M4136G27U1OS11)

• Fits rider: 5’3″–6’0″ (Mongoose product page); 4’0″–5’0″ (Amazon listing)
• Frame: hi-ten steel; fork hi-ten steel
• Tires: 20 x 2.35 in
• Brake: aluminum U-brake
• Crank: 1-piece forged steel, 25T; 9T rear hub
• Handlebar: 28.25 in wide, 8.25 in rise
• Weight: 28.6 lb (Amazon listing); max rider weight 200 lb (Amazon listing)
• Warranty: limited lifetime on frame, 1 year on parts (Amazon listing)
• Price tier: $$

cubsala Echo, 24-Inch for Tall Kids

Evidence: No independent test; maker specs. Source: cubsala’s Amazon listing (no maker spec page found).

cubsala sizes the 24-inch Echo for riders from about 4’4″ to 6’2″ and builds it on a high-tensile steel frame with a rear U-brake and four pegs, 85% pre-assembled. It publishes no weight. On r/bmx, one commenter wrote that a 24-inch wheel “isn’t a kids bike size, it’s a cruiser class size” (thread); another wrote, “It’s a big feeling bike even for a grown adult,” and suggested an 18-inch for a 6-year-old instead. Choose the Echo for a tall child who wants a relaxed BMX-style ride to school or the park, not for learning tricks.

It is sold by a third-party seller, BreezeBuy Limited, and shipped by Amazon. We found no independent review of the Echo; the specs are cubsala’s own Amazon listing.

Specs (linked: cubsala Echo, 24 in, Black & Black)

• Fits rider: about 4’4″–6’2″ (cubsala)
• Frame: high-tensile steel
• Brake: rear U-brake
• Extras: four pegs, reflectors, tool kit
• Weight: not published
• Warranty: 1 year (Amazon listing)
• Price tier: $

What Matters on a Kid’s BMX

Helmet on every ride. The AAP says a child “needs to wear a helmet on every bike ride, no matter how short or how close to home,” and that most bike crashes happen near home (HealthyChildren.org). Use a bicycle helmet, or a multisport helmet certified for bicycle use by the U.S. Consumer Product Safety Commission; our child bicycle helmet guide compares options.

Fit first, then weight. The AAP’s test: your child can sit on the seat, hands on the bars, with the balls of both feet on the ground. Among bikes that fit, the lighter one is easier to lift over curbs and into the car; confirmed weights here range from 23.2 lb (Legion L18) to 32 lb (Legion Mag), both from Amazon listings.

Brakes your child can use. The AAP recommends foot (coaster) brakes on a child’s first bike. Most picks here have a hand-operated U-brake instead; the Switch has both, and the Tony Hawk 720 has front and rear hand brakes. Before a first ride, check that your child can reach and squeeze the lever.

Crank and bearings. A 1-piece crank and loose-ball bottom bracket are what most budget picks here have, and fine for riding around. If your child is heading for the skatepark every weekend, look for the 3-piece crank and integrated headset that one r/bmx commenter names as a trick bike’s minimum (the Elite Pee Wee 18 has both), or at the BMX-shop brands r/bmx commenters recommend.

Assembly. Bikes arrive partly built. Have a bike shop check the brakes, headset and wheel nuts if you are not confident; Elite says assembly by anyone other than a certified bike technician may void its warranty.

Looking for a different kind of bike? See our pages on bikes for a child, bikes for kids’ triathlons and all our kids’ bikes and ride-ons.

Frequently Asked Questions

It depends on height more than age. Makers list their 20-inch kids’ BMX bikes from about age 6 or 7 (Dynacraft 6–10, RoyalBaby 7–12) or from a height (Mongoose’s Legion Mag from 4’6″ on its product page, 4’8″ on Amazon; its Legion L10 from 5’3″ on its product page, 4’0″ on Amazon). Elite’s Amazon listing says 11+ (4’0″ to 5’10”) for its 20-inch. Dan’s Comp’s freestyle chart starts 20-inch wheels at 4’8″. Dan’s Comp puts riders under 4’8″ on 18-inch wheels, so a shorter child usually fits an 18-inch such as the Mongoose Legion L18 (Mongoose: 3’8″ to 4’10”) better; check with the AAP’s seated fit test.

Of the brands in this guide, Mongoose has the most picks, covering 18- and 20-inch sizes: the Legion L18, Legion Mag, Legion L10 and Switch. The brands r/bmx riders recommended for kids in the threads we read, such as Kink, Cult, Sunday, WeThePeople and Fit, are mostly sold through BMX shops rather than Amazon.

For most kids, a starter BMX is one that fits now. Picks: Mongoose Legion L18 for riders within Mongoose’s 3’8″ to 4’10” range; RoyalBaby BMX Freestyle 20 in aluminum for a child tall enough for a 20-inch (RoyalBaby lists ages 7-12; check height first); Mongoose Switch if your child still needs training wheels.

No. The AAP calls oversized bikes “especially dangerous” because a child may lose control. Buy the size that fits today, and pick the smaller size if your child is between two.

Yes, on every ride. The AAP says a helmet belongs on every bike ride, however short or close to home (HealthyChildren.org).

The bottom line

Final Verdict

For kids within Mongoose’s 3’8″ to 4’10” range, start with the Mongoose Legion L18 (check price): it is kid-sized, sold by Amazon, and has the lightest confirmed weight here. For a child tall enough for a 20-inch (RoyalBaby lists ages 7-12; check height first), the RoyalBaby BMX Freestyle 20 in aluminum (check price) keeps the weight down and adds sealed bearings. For riders from about 4’6″ (Mongoose’s product page; 4’8″ on Amazon) who want pegs, the Mongoose Legion Mag (check price) is the 20-inch to look at. Whatever you choose, check the fit with your child on the bike, and put a helmet on every ride.

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.