Guardian 24 Inch Bike Review – A fun city bike!

There are a lot of options for 24″ bikes, but for families sticking to basic neighborhood riding, the Guardian 24 is a solid choice. With smooth-rolling tires and several fun colorful designs to choose from, it’s a great bike for cruising to a friend’s house or joining the family on a ride to the park.

In this review, we’ll cover everything you need to know about the Guardian 24, including who it’s not ideal for (hint: aggressive riders or those tackling mixed terrain). We’ll also compare it to competitors so you can make sure you’re getting the best bang for your buck.

Why trust us? We’ve reviewed over 40 different 24″ kids’ bikes over the last 15+ years and have been reviewing Guardian bikes since before they appeared on Shark Tank. They even mentioned us on the show!

quick look

Guardian Bikes 24

MSRP: $349
BEST FOR: Neighborhood riders in size 7/8 pants. Great for timid riders as well as adventurous riders sticking to paved surfaces.
SEAT HEIGHT: 25″ to 33″
WEIGHT: 25.5 lb. (with kickstand and pedals)

ADDITIONAL SPECIFICATIONS
GEARS: 7-speed
GAIN RATIO: 2.45 to 5.6
BRAKES: SureStop Dual Hand
FRAME: Steel

Pros:

• Unique SureStop braking system delivers dual-brake stopping power from a single lever
• Low center-of-gravity design for better balance and maneuverability
• Easy-to-use grip shifter with kid-friendly “man in the window”
• Fun, kid-approved designs
• Height-adjustable handlebars to accommodate growing riders

Cons:

• Narrower gear range than similarly priced competitors
• No derailleur hanger on the frame
• Pricing on their website can be confusing since bikes are always shown at a “sale” price. Those sale prices are effectively the regular prices. Ignore the “Comp Value”
• SureStop doesn’t allow for independent front and rear braking, which older and more aggressive riders increasingly need
• Because the front and rear brakes are linked, if the rear brake fails, the front brake fails with it. This is very rare, but worth understanding

24 Inch on Guardian

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

By the time kids reach 8 or 9, most are either really into biking or have lukewarm feelings about it. With scooters and ebikes becoming more popular, regular bikes can easily take a back seat by the time your child is ready for a 24″ bike.

Having had 8 and 10-year-old myself, I’ve seen this firsthand. My kids enjoy riding and will happily join a family bike ride, but long gone are the days of them begging to go out. The Guardian 24 changed that. There’s just something about Guardian bikes that gets kids excited. Whether it’s the fun color schemes or the SureStop braking system, these bikes have a way of pulling kids back outside.

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 provide plenty of traction on sidewalks, roads and even grass.

With a natural, semi-upright body position, the Guardian 24 is comfortable enough for longer rides while still giving more adventurous riders room to shift their weight around on the bike.

What Type of Rider Is the Guardian 24 NOT Ideal For?

Guardian’s braking system does not allow the rider to brake the front and rear wheels independently. The front brake won’t engage until the rear brake does first. As a result, Guardian bikes are not the best fit for more technical riders, such as mountain bikers or advanced road riders, who need independent brake control.

The narrower gear range is also worth considering for kids who regularly tackle hills. The lowest gear on the Guardian isn’t as low as what you’d find on some competitors, which can make climbing more of a workout than necessary.

Guardian’s SureStop Braking System

Guardian’s unique braking system activates the rear brake first, then the front brake, all from a single lever. Once the lever is pulled, the rear brake engages.

From there, the SureStop system uses the friction created between the rear brake pad and the wheel’s rim to push the pad slightly forward, which pulls an attached wire that triggers the front brake.

This sequential design provides strong stopping power from one lever and prevents kids from accidentally grabbing only the front brake, which can cause the front tire to lock up and the rear wheel to lift.

How does it feel? 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.”

I was skeptical that brakes could make that much of a difference, so I tried it myself. Within a few minutes I understood. SureStop braking feels notably more intuitive and confidence-inspiring than a standard two-lever setup, especially for kids who are still building their riding instincts.

The downside worth understanding: Because both brakes are linked through a single lever and rear caliper, the system has a single point of failure. If the rear brake is damaged, whether from a crash bending the lever or a cable issue, the front brake cannot be activated either. 

When SureStop first launched, we were genuinely impressed but after years of extended real-world testing we have some reservations. While rare, we’ve personally seen two Guardian bikes lose their brakes, one due to a broken brake lever and one from a stretched cable noodle holder. Both were repairable, but it’s important to understand how this system differs from two fully independent brakes. Do regular safety checks, and pay particular attention to the rear brake components.

Additionally, as kids grow into more aggressive riding styles, the inability to brake front and rear independently also becomes a real limitation. If your child wants to slow down going over a jump or dropping a curb, using only the rear brake is the right technique. SureStop doesn’t allow that. If you anticipate your child becoming a more aggressive rider, the Guardian is likely not the best long-term choice.

What size rider fits on the Guardian 24?

The Guardian 24 has a seat height range of 25″ to 33″ and fits kids with inseams ranging from 23″ to 30″. Guardian’s official height recommendation is 49″ to 57″. As with any bike, it will feel a bit large at the lowest saddle setting and a bit snug at the highest.

Our 6-year-old tester is 49″ tall with the saddle near its minimum and handlebars at their lowest. Our 11-year-old tester is 57″ tall with the saddle at 31.5″ and handlebars at their highest. Both riders are comfortable, which gives you a good sense of the bike’s range.

If your child is currently on a Guardian 20″ Small, the Guardian 24 is the intended next step. If they’re outgrowing a Guardian 20″ Large, the Guardian 26 is the better fit.

Sizing Comparison: Guardian 24 vs. 20 Large

Our 6-year-old tester is 49″ tall with a 22.75″ inseam and weighs 59 lbs. She barely fits on the 24″ at its lowest saddle position but is a very comfortable fit on the 20″ Large with several more inches of growth remaining on that bike. While she has ridden the Guardian 24 to and from school successfully, she finds it noticeably more difficult to manage and clearly prefers the 20″ Large. If your child is in a similar situation, don’t rush the upgrade.

Sizing Comparison: Guardian 24 vs. 26

Our 8-year-old tester is 53.75″ tall. On the Guardian 24, the seat is set to 28″. On the Guardian 26, the seat is at its minimum of 28.1″. She fits fine on the 26 but greatly preferred the 24.

Our 10-year-old tester is 57″ tall, maxed out on the 24, and has the 26 seat set to 30.4″. She preferred the longer, taller 26.

While you could transition a child growing out of the Guardian 24 to the Guardian 26, the overlap is sizing doesn’t provide the best room for growth.

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

Guardian Bikes Models and Sizes

Notable Guardian 24″ Bike Components

Child-Friendly Shifter

Like many other brands, Guardian uses Microshift’s “man in the window” grip shifter, which helps kids visualize what gear they’re in. The man moves each time you twist the shifter, pointing uphill for lower climbing gears and downhill for higher speed gears. It’s an intuitive system that kids pick up quickly.

Gearing

To understand gear range, think of it this way: lower numbers mean easier gears for climbing hills, while higher numbers mean harder gears for going fast on flat ground. A wider range means more versatility between those two extremes.

The Guardian 24 is a 7-speed bike with a gain ratio range of 2.45 to 5.6. That range leans toward speed on the high end rather than climbing ease on the low end, which is worth knowing if your child regularly tackles steep hills. For comparison, the Kent MTX has the widest climbing range of the bikes we’ve tested at this size, spanning from 2.03 to 5.0.

Lack of Derailleur Hanger

One feature we wish the Guardian 24 included is a derailleur hanger. This small, soft piece of metal sits between the frame and the derailleur and acts as a crumple zone. If the derailleur takes a hit from a crash or from the bike being dropped on its side, the hanger is designed to bend and absorb the impact rather than letting the derailleur itself get damaged. Derailleur hangers are also inexpensive and easy to replace, typically costing just a few dollars.

Without a derailleur hanger, that protection doesn’t exist. A hard enough impact can damage the derailleur or, in worse cases, the frame itself. On a Guardian, it’s important to make sure the bike is never set down on the derailleur side. Teach your child to always use the kickstand or to lay the bike down with the chain side facing up.

Weight

Ideally a kids’ bike should weigh less than 40% of the child’s body weight, though that’s hard to achieve at this size. At 25.5 lb., the Guardian 24 is lighter than many bikes in this category, including the 29.9 lb. Huffy GRM.

That said, context matters: the Retrospec Dart comes in at a similar weight and costs about $100 less. And higher-end aluminum-frame bikes like the Priority Start 24 (23.3 lb.) are lighter still, at a higher price. If your child is an aggressive or high-mileage rider, the weight difference is worth factoring in. For the average neighborhood rider, the Guardian’s weight is perfectly manageable.

Height Adjustable Handlebars

The Guardian 24 features a threaded headset that allows the handlebars to be raised as your child grows, which helps maintain a comfortable riding position without requiring a new bike. For neighborhood and city riding, the hold is solid and reliable.

Quick Release Seat Post and Kickstand

The Guardian 24 comes with a tool-free quick-release seat clamp, which makes seat height adjustments fast and easy as kids grow. A pre-installed kickstand keeps the bike upright and out of the way when not in use.

Easy Assembly

Every Guardian bike is pre-assembled in Indiana. Out of the box, both wheels are already attached. All that’s left is securing the seat post, attaching the pedals, and installing the handlebar. Alignment marks on the handlebars and stem make positioning straightforward.

Guardian 24 Inch Bike Bottom Line

The Guardian 24 is a well-built, mid-range kids’ bike that’s a genuine step up from big-box store options. The kid-friendly geometry, SureStop braking, and fun designs make it easy and enjoyable for most neighborhood riders.

A couple of things worth knowing going in: Guardian uses steel frames, so the bikes run a bit heavier than some aluminum-frame alternatives at similar price points. And while SureStop is a great system for younger or less aggressive riders, it’s worth understanding how it works and where its limitations lie as kids grow into more independent riding.

For the average neighborhood rider who wants a quality, fun bike with reliable brakes, the Guardian 24 is a solid choice. Just know that the Retrospec Dart offers similar weight at a lower price, and aluminum-frame options like the Priority Start 24 are worth comparing if weight or aggressive riding is a priority.

Related Guardian Articles and Reviews

• Guardian 16-inch Bike Review
• Guardian 20-inch Bike Review
• Guardian 24-inch Bike Review
• Guardian Adult Bike Review

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.