Cobra RadSpeed Junior Driver: Sizing, Specs and What to Buy (2026)

By Levi Porter

A cobra radspeed junior driver is built for kids who need a forgiving, lightweight club that still delivers speed. This guide walks you through matching the right model to your child’s height, age and swing speed, then explains how to check the shaft, loft and length before you buy. By the end, you will know which specs matter and which ones you can safely ignore.

What the Cobra RadSpeed Junior Driver Is Designed For

Cobra’s junior line uses the same general design philosophy as its adult RadSpeed family: a large, forgiving clubhead with weight placed to help launch the ball higher and reduce sidespin. For a young golfer, that combination matters more than raw distance. A driver that is too heavy or too long encourages the swing to break down, while a properly fitted junior driver lets a child make a full, balanced turn.

Junior drivers in this category are generally aimed at children who are still growing into full-length clubs. They typically feature graphite shafts, lighter swingweights and shorter lengths than adult drivers. Before you commit to a model, confirm the specific version and specs on the manufacturer’s current listing, since Cobra updates junior models periodically.

Step 1: Measure Your Child’s Height and Wrist-to-Floor Distance

Length is the single most important fitting measurement for a junior driver. A club that is even one inch too long can throw off posture, lie angle and contact quality. Start with two simple measurements.

Have your child stand barefoot, relaxed, with arms hanging naturally.
Measure from the floor to the crease of the wrist, with the wrist straight and the arm at the side.
Record that number in inches. This is your wrist-to-floor measurement.

As a general rule, wrist-to-floor measurements map to club length ranges. Shorter measurements call for shorter drivers, and the length chart supplied by the manufacturer should always take priority over generic guesses. If your child’s measurement falls between two sizes, lean toward the shorter option for beginners, since control is easier to build than power.

Step 2: Match the Age and Height Range

Cobra and other junior club makers generally organize their lines by age band, with height as a secondary check. Use the table below as a starting framework, then confirm against the chart on the product page.

Approximate Age	Typical Height Range	What to Prioritize
3 to 5 years	Under about 3 feet 6 inches	Very light weight, short length, large grip
6 to 8 years	About 3 feet 6 inches to 4 feet 6 inches	Light graphite shaft, moderate length, high forgiveness
9 to 11 years	About 4 feet 6 inches to 5 feet 2 inches	Lightweight shaft that is stiff enough to control direction
12 years and older	Above about 5 feet 2 inches	Check transition to adult specs and swing speed

Ages are approximate. Two children of the same age can need very different equipment because of growth spurts and differences in strength. Height and wrist-to-floor measurement are more reliable guides than age alone.

Step 3: Check Shaft Flex and Swing Speed

Shaft flex is often misunderstood. For most young golfers, a junior or ladies-style flex is the right starting point, because it loads and releases easily at lower swing speeds. A shaft that is too stiff makes the ball fly left or right, and it tends to produce weak, high shots that lose distance.

Signs the Shaft Is Too Stiff

Shots consistently drift right for a right-handed golfer, or left for a left-handed golfer.
The ball does not get airborne easily and balloons low.
Your child says the club feels hard to swing through, or it jars the hands on contact.

Signs the Shaft Is Too Whippy

Shots flare or hook unpredictably.
The clubface seems to close late, producing hooks even on swings that feel square.

If you are unsure which flex fits, a local PGA professional or a junior-focused club fitter can test swing speed with a launch monitor in a short session. Many junior programs offer this, and it is well worth the time.

Step 4: Evaluate Loft and Swingweight

Loft controls launch angle and spin. Junior drivers usually come with more loft than adult drivers, which helps children get the ball airborne with a smaller swing. A higher-lofted driver is often more forgiving for beginners, but going too high can cost distance once a child begins to generate more clubhead speed. Choose the loft listed for your child’s size band, and plan to revisit it as swing speed improves.

Swingweight is the balance point felt during a swing. Manufacturers specify swingweight in their listings, and lighter values help children maintain tempo. If your child struggles to finish swings or feels fatigued after a few shots, the swingweight may be too heavy even if the length is correct.

Step 5: Confirm Grip Size and Headcover Fit

Grip size is easy to overlook. A grip that is too thick restricts wrist motion and encourages a slice, while one that is too thin can cause the hands to roll over the club. Junior grips are typically thinner than adult grips. Have your child hold the grip and close the fingers; there should be about a finger’s width of space between the palm and fingertips. If the fingertips press firmly into the palm, the grip is likely too large.

Common Mistakes When Buying a Junior Driver

Buying one size up to grow into it. An oversized driver teaches poor posture and inconsistent contact. Buy for today’s measurements and upgrade when your child outgrows the length.
Choosing by age alone. Growth rates vary widely. Use height and wrist-to-floor measurements.
Ignoring flex. A shaft that is too stiff or too whippy can make a good clubhead perform poorly.
Using adult swing speed assumptions. Junior swing speeds are much lower, so adult flex recommendations rarely apply.
Skipping a test swing. Whenever possible, have your child hit a few balls before purchase or at a demo day.

Tips for Getting the Most From a Junior Driver

Re-measure every six months during growth periods.
Keep the grip clean and replace it when it becomes slick or worn.
Pair the driver with a set of junior tees sized correctly for your child’s ball striking, so practice sessions stay consistent. Our guide to Golf tees can help narrow your options, and 8 Best Golf Tees for Driver Compared for Junior Golfers (2026) covers the most common choices.
Practice in a controlled space first. A junior-sized net or mat lets your child focus on tempo and contact without losing balls. Best Golf Practice Net and Mat for Junior Golfers: What to Buy explains what to look for.
Keep track of swing changes. If distance or accuracy drops suddenly, check whether the club has become too short or too light for your child.

Recommended Gear

Junior golf tees designed for drivers. Longer tees keep the ball at a launch height that suits a junior driver’s loft, and sturdy tees reduce breakage during practice. View on Amazon
Junior practice net. A compact net gives children a safe place to work on driver tempo and contact at home. View on Amazon
Replacement junior grips. Fresh grips in the correct size help maintain control as the club ages. View on Amazon

FAQ

What length cobra radspeed junior driver does my child need?

Use your child’s wrist-to-floor measurement and compare it to the length chart on the manufacturer’s listing. Length should match the chart, not the age range alone.

Is a junior driver better than an adult driver for beginners?

For most young beginners, yes. Junior drivers are lighter, shorter and designed for lower swing speeds, which makes them easier to control and less likely to cause poor habits.

When should my child move up to an adult driver?

Most children move up when they reach the height and wrist-to-floor range of adult lengths, or when their swing speed and strength outgrow the junior specs. A club fitter can confirm the transition point.

Does the cobra radspeed junior driver come in left-handed versions?

Availability varies by model year and retailer. Check the product listing for handedness before ordering.

How do I know if the shaft flex is right?

Watch the ball flight over several shots. Consistent left or right misses, low launch or unpredictable flares can all point to the wrong flex. A launch monitor session is the most reliable check.

Can I use a junior driver for practice with adult clubs in the bag?

Yes. Many children carry a junior driver alongside adult irons and wedges. Just confirm that the driver length and weight still feel natural during a full swing.

Should I buy new or used for a junior driver?

Used junior clubs can work well if they are in good condition and match your child’s measurements. Inspect the shaft for cracks, the clubhead for damage and the grip for wear before buying.

How often should I check fit as my child grows?

Re-measure every six months during fast growth periods, and at least once a year otherwise. A quick check prevents months of poor swing habits caused by a club that no longer fits.

Conclusion

Choosing a cobra radspeed junior driver comes down to measuring your child accurately, matching length and flex to their size and swing speed, and checking loft and swingweight against the manufacturer’s specs. Start with wrist-to-floor measurements, avoid buying oversized for growth, and re-check fit regularly. A correctly fitted junior driver builds confidence and good habits that carry into the adult game.

Ready to choose one?

About Levi Porter

Levi has been writing about junior golf gear for this site, with an eye on clear explanations, honest trade-offs and options for different needs and budgets.

About the author

Levi Porter

Levi Porter writes reviews and buying guides for Junior Golf Results.