Lauren HollandBy Lauren Holland

Updated November 2026

A youth riding gear size chart only helps if you know which measurements to take and how the sizing works. This guide shows you how to measure your child for helmets, jerseys, pants, boots and gloves, how to read a manufacturer chart, and how to check fit before the first ride. Sizing by age alone is one of the most common reasons kids end up in gear that is too big or too tight.

Why Age Charts Fall Short

Most youth gear is labeled by age, such as Youth Small or Youth Large, but a 10-year-old can be anywhere from 50 to 70 pounds and 50 to 60 inches tall. Brands also cut their youth patterns differently. Always use the brand’s own size chart, and treat age as a starting point only. Measurements are what decide the fit.

Shopping for one? See our guide: 6 Best Youth Riding Gear Sets for Motocross and Trail Riders.

Step 1: Gather the Measurements You Need

Before you open any chart, have a soft tape measure, a helper, and your child’s current riding boots if they have them. Measure over light clothing, not over a hoodie, and have your child stand straight with feet together.

  1. Height: Stand against a wall, mark the top of the head, and measure from the floor.
  2. Chest: Measure around the fullest part of the chest, keeping the tape level under the arms.
  3. Waist: Measure at the natural waistline, usually just above the belly button.
  4. Inseam: Measure from the crotch to the bottom of the ankle bone.
  5. Hand: Measure around the knuckles, excluding the thumb, and the length from the wrist crease to the tip of the middle finger.
  6. Foot: Trace the foot on paper and measure heel to longest toe, then compare with the boot chart in centimeters or Mondo points.
  7. Head: Measure around the head about one inch above the eyebrows, the widest point.

Step 2: Match Each Measurement to the Chart

Each piece of gear uses different measurements, so do not rely on a single overall size. Use the chart below as a general guide to what each measurement controls. Always confirm against the specific brand’s chart before buying.

Gear Primary measurement Fit check
Helmet Head circumference Snug with no pressure points; the cheek pads should touch the face
Jersey Chest and height Room to raise arms without the hem lifting far above the waistband
Pants Waist and inseam Sits at the natural waist and reaches the top of the boot
Boots Foot length About a thumb’s width of space at the toe, heel does not lift
Gloves Hand circumference and length Fingers reach the tips without bunching; full grip is possible

Step 3: Check Fit Before the First Ride

Have your child put on all the gear and move around. Ask them to stand in a riding position, reach forward, and sit as if on the machine. Check that the helmet does not shift when you gently twist it, that the jersey and pants stay in place, and that boots support the ankle without pinching the toes. If any piece feels loose in a riding stance, try the next size down before deciding it will “grow into it.” Gear that fits loosely can slide and reduce protection in a crash.

If your child is between sizes or has an unusual build, consult the manufacturer’s customer service or a knowledgeable local dealer, and ask them to confirm fit in person when possible.

Common Mistakes

  • Buying a size up so the gear will “last longer.” Oversized helmets and boots move during impacts and lose protection.
  • Measuring over a jacket or sweatshirt, which adds inches to the chest and waist.
  • Using one brand’s chart for another brand’s gear without checking.
  • Skipping the boot measurement and guessing from shoe size.
  • Forgetting to re-measure every season, since kids can grow several inches in a year.

A few items make the sizing process easier and more accurate:

  • A flexible cloth tape measure gives the most accurate chest, waist and head readings. View on Amazon
  • A youth riding helmet with a fit system lets you fine-tune the inside padding to the head shape. View on Amazon
  • Youth riding boots with a printed size chart make it easier to match foot length to the correct size. View on Amazon

FAQ

Can I use my child’s shoe size to choose riding boots?

Not reliably. Riding boots are sized by foot length in centimeters or Mondo points, and brands fit differently. Measure the foot and compare it to the boot maker’s chart instead.

How do I know if a youth helmet fits?

It should feel snug all the way around, with the cheek pads touching the face and no movement when you twist it gently. Fasten the chin strap and check that the helmet stays put when your child shakes their head.

How often should I re-measure my child for riding gear?

Check measurements at the start of each riding season and any time your child has had a growth spurt. Kids often change size faster than parents expect.

Conclusion

A youth riding gear size chart is most useful when you measure your child’s height, chest, waist, inseam, hands, feet and head, then match each one to the brand’s own chart. Test fit in a riding position before the first ride. Good fit keeps gear working the way it was designed to, so take the few extra minutes to get it right.

Ready to choose one?

Lauren Holland

About Lauren Holland

Lauren Holland is part of our editorial team and reviews and edits our ATV, UTV/side-by-side & dirt bikes guides, checking product details against manufacturer specifications and owner feedback.