Guardian 24 Inch Bike Review

Whether cruising the neighborhood or on a long family ride, Guardian 24 inch bikes are exceptional. With kid-friendly designs in both traditional boy and girl colors, durable builds and construction as well as their proprietary SureStop braking system, there is a lot to love about Guardian Bikes. In this review, we’ll cover everything you need to know about 24″ Guardian bikes, including sizing, ease of assembly, and comparisons to similarly-priced bikes.

*Guardian Bikes previously offered two lines of bikes – Airos and Ethos. They now only offer one model similar to their old Ethos line.*

young rider on the Guardian 24 kids bike

Guardian 24 Inch Bike Overview

RATING: Highly Recommended

MSRP: $339

BEST FOR: Neighborhood riders in at least size 8 pants. Great for timid riders as well as adventurous riders sticking to paved surfaces.

SEAT HEIGHT: 25″ – 33″

WEIGHT: 25.5 lb.


GEARS: 7-speed Mega Range
FRAME: Steel
GAIN RATIO: 2.45 – 5.6
BRAKES: Surestop Dual Hand
TRAINING WHEELS: Optional, $39


  • Patented SureStop braking system for faster and more controlled braking
  • Low center-of-gravity design for better balance and maneuverability
  • Great quality build for the price
  • Fun, kid-approved designs
  • Height adjustable handlebars to allow the bike to grow with the child
  • Double-walled rims can take a beating and still stay true and roll straight


  • Heavier than other (more expensive) bikes we recommend

Guardian 24 Inch Bike Video Demonstration

Want to see the Guardian 24 inch bikes in action? Check out our video review to learn why kids and parents both love Guardian Bikes. Please note that this video points out the differences between the older “Airos” and “Ethos” models. As of 2023, the Guardian 24″ bike very similar to the previous “Ethos” model.

Guardian 24 Inch Bikes Put to the Test – Our Complete Review

By the time kids reach the age of 8 or 9, most are either really into biking or have lukewarm feelings about it.  With scooters and hoverboards becoming more and more popular, bikes can often get a second seat by the time your child is ready for a 24 inch kids bike.

Having an 8 and 10-year-old myself, I’ve witnessed the problem firsthand.  My kids do enjoy riding bikes and will gladly go on family bike rides, but long gone are the days of them begging us to go riding.  That was… until we got the Guardian Bikes 24 inch bike.  Now they fight over whose turn it is to ride it – the “loser” has to ride the $1,200 mountain bike!

10 year old rider on the Guardian 24 kids bike
A very tall 10 year old on the Guardian 24

There’s just something different about Guardian Bikes – kids just love them! Whether it’s the fun color schemes or the cool braking system, Guardian bikes are sure to get your kids outside and riding.

What type of rider is the Guardian 24 best for?

Guardian bikes are designed specifically for the average neighborhood rider who sticks mainly to paved surfaces. The smooth rolling tires on the Guardian provide plenty of traction on sidewalks, roads, smooth, compact dirt trails, and even grass!

riding the guardian 24 inch kids bike on the grass
8-year-old tester in size 8 clothes

With a comfortable, semi-upright geometry, the Guardian 24 positions the rider upright enough to be comfortable for longer riders, while also being leaned-in enough to give aggressive riders room to shift their body weight around on the bike.

What type of rider is the Guardian 24 NOT ideal for?

Guardian’s unique braking system does not allow the rider to brake the front and rear brake independently.  The front brake won’t engage until the rear brake does.  As a result, Guardian bikes are not ideal for more technical riders, such as mountain bikers or even more advanced road riders, who need the ability to use their brakes independently. 

What size rider fits on the Guardian 24?

The Guardian 24 has a seat height range of 25″ to 33″ and is a good fit for kids with inseams ranging from 23″ to 30″. Like all kids bikes, the bike will feel a bit too big for kids riding with the saddle at the lowest and a bit too small for those riding with the saddle at the highest position. But our testers on both ends of the spectrum still enjoyed riding the Guardian 24.

side by side images of the 7 and 10 year old riders on the Guardian 24 bike
7 year-old riding at the lowest seat height and 10 year old riding at the max

If your child is already on a 20″ Guardian bike, the Guardian 24″ is generally a best fit for kids outgrowing the Guardian 20 small.

side by side images of a 7 year old rider on the Guardian 20" Small and the Guardian 24" bike
7-year-old on Guardian 20″ Small and Guardian 24″

If your child is outgrowing a Guardian 20″ Large, the larger Guardian 26″ is very likely a better option as it is only slightly bigger than the Guardian 24″ and will provide more room for growth.

Guardian 24 or 20 Large?

If you’re torn trying to decide on sizing between the Guardian 20″ large and the Guardian 24″, here’s a helpful size reference. Our 6-year-old rider is 49″ tall, has a 22.75″ inseam without shoes, and is 59 lbs. She barely fits on the 24″ with its saddle at its lowest point, but is still a very comfortable fit on the 20″ L and has several more inches of growth on that bike.

While she has successfully ridden the Guardian 24″ to and from school several times, it is noticeably more difficult for her to manage than the smaller Guardian 20″ L.

Comparison of 6 year old riding Guardian 20 large and Guardian 24.

Check out the comparison chart below to see the differences between Guardian’s size range.

Guardian Bikes Models and Sizes

Size20″ Small20″ Large24″26″
Review20″ Small Review20″ Large ReviewYou’re reading it!26″ Review
Est. Age5+5+7+8+
Seat Height20.8″ – 26.8″22.5″ – 28.5″25″ – 33″27.7″-33.5″
Child’s Height43″ – 51″45″ – 53″49″ – 61″52″ – 62″
GearingSingle Speed6 Speed7 Speed7 Speed

Guardian Bike’s Patented SureStop Braking Technology

While there’s a lot of love about Guardian bikes, they are different from every other kids bike on the market due to their patented SureStop braking system. This unique braking system allows the rear and then the front brake to be activated sequentially with the pull of ONE brake lever.  Once the lever is pulled, the back brake is activated.  Once the rear brake has engaged, the SureStop system on the rear brake pad then activates the front brake. 

Graphic showing three steps to Guardian's SureStop braking system. Step One: Child activates brake lever, Step Two: Rear Brake Engages, Step Three: Rear brake activates front brake.

This sequential stopping system allows the bike to stop faster and with more control.  It also prevents kids from going over the handlebars by accidentally braking with just the front brake.

How does it feel to brake on a Guardian Bike?

In the words of my 10-year-old daughter, “I love the brakes!  It’s so much easier to only worry about one brake lever.”

My kids’ expensive mountain bikes have really nice hydraulic disc brakes and really are AMAZING bikes, but unless we’re headed up the mountain, they both prefer the Guardian simply because of how easy it is to brake.  I was surprised that the brakes on a bike could make that much of a difference, so I hopped on the beloved Guardian and tested out the brakes myself.

Easy reach lever on Guardian Bikes. It's only one lever - the right lever.

Within a few minutes, I understood their perspective.  Braking with SureStop brakes provides a similar feeling to braking in a new car with an advanced braking system versus an older car with a standard braking system. 

Not only is it easier to brake faster, you feel MUCH more in control of the car (bike!).  As a result, you’re a more confident driver in a car with advanced brakes and driving is more fun as well.

How Do Guardian’s SureStop Brakes Work?

Guardian’s system works via a proprietary rear brake pad that responds to the friction created between the brake pad and the tire’s rim when the rear brake engages.  The friction between the rim and the brake pad pushes the pad slightly forward.  When the pad slides forward, it pulls on the attached wire that then triggers the front brake to engage.

Picture with diagram showing how SureStop brakes work. 1. Rear brake pad slides slightly forward due to friction from rim. 2. Wire on brake is pulled which triggers the front brake.

Is the SureStop System Safe?

Yes!  With one lever to pull, we have found the SureStop system to be easier for younger kids to navigate than dual-braking systems.  With no fear of braking wrong, there is less hesitation from kids when it comes to braking.

Many parents have expressed concerns over having both brakes dependent on one braking system.  If the SureStop system were to fail (which we’ve never had happen), the rear brake would still engage, just not the front brake. Both brakes will not go out at the same time.

child riding down a curb on a Guardian 24 inch kids bike

Over the past several years we’ve tested and owned almost 10 different Guardian Bikes and have never had the system fail.  During this time, two of these well-loved bikes have had their shifters go out, but we’ve never had an issue with the brakes.

That being said, if the rear brake itself were damaged or bumped out of alignment during a fall and stopped working, then both brakes would not work because the rear brake couldn’t activate the front brake. Caliper brakes, however, don’t just stop working out of the blue.  They can be damaged during a severe fall, but stopping randomly while riding a bike?  We’ve never heard of that happening in our 10+ years of bike testing.

Just like with any bike, it’s a wise practice to check your brakes before starting a ride, and especially after any crashes.

Notable Guardian 24″ Bike Components

How much do Guardian 24″ Bikes Weigh?

Ideally, a bike should weigh less than 40% of a child’s weight, but that’s often hard to achieve for kids. (For reference, most adults ride bikes that are no more than 20% of their weight!).  The Guardian 24″ bike weighs 25.5 lb. which is several pounds lighter than other budget-friendly 24″ bikes, such as the 28 lb. Retrospec Koda 24.

Higher-end brands that have aluminum frames are lighter than Guardians which have a steel frame. Guardian Bikes also weigh more than higher-end brands due to their double walled, high-spoke-count wheels.  Built to withstand anything kids can throw at them (even stairs!), Guardian’s durable wheels are sure to stay true.

Threaded Adjustable Height Headset

The Guardian 24″ Bike features a threaded headset that allows you to raise the handlebars as your child grows. Raising the handlebars prevents your child from having to slouch down to reach the handlebars when the seat height is raised.

threaded headset of the Guardian 24 kids bike

Quick Release Seat Post and Kickstand

To keep seat changes quick and easy, the Guardian 24 comes with a tool-free, quick release seat post clamp. Considering how fast kids grow, we love not needing to track down the right tool whenever a seat needs adjusting. Every Guardian also comes with a pre-installed kickstand to help keep the bike upright, free of dings and out of the way.

Collage showing Guardian 26 saddle and kickstand


In order to ensure quality and ease of assembly, every Guardian Bike is assembled, tuned, and packaged by Guardian’s own mechanics in their Indiana factory BEFORE they are shipped out to customers. All the bikes we’ve received from Guardian were ridiculously easy to assemble, were put together in less than 15 minutes, and required no additional tuning once assembled.

To ease in assembly, Guardian bikes also come with color coded stickers to make the parts you do have to assemble (essentially putting on the handlebars, pedals and front wheel), quick and easy.

Stickers on the Guardian bike help simplify the final assembly

Guardian 24 Inch Bike Bottom Line

Safe, lightweight, and fun to ride, Guardian’s line of bikes truly stands out. Whether cruising the neighborhood or enjoying extended family bike rides, your child will be in good hands with a Guardian and SureStop brakes.

FTC Disclosure: Affiliate links are included in this review.  No monetary compensation was provided for this review, however, the reviewed product was supplied by the manufacturer or distributor to help facilitate this review. All opinions and images are that of Two Wheeling Tots LLC.  All content and images are copyrighted and should not be used or replicated in any way. View our Terms of Use.

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