Kids · Boys'
Size-matched helmets for older kids (ages 8–12), with color and style notes typically preferred by boys in this age range. Fit remains the priority — pattern and color second.
Open the helmets calculatorChildren ages 8–12 are becoming serious riders — many ride to school, explore trails, or develop interest in specific cycling disciplines like mountain biking or BMX. At this age, bikes transition from toy-like simplicity to real cycling machines with proper gear systems, disc brakes, and even suspension. The key sizing decision is between 20" and 24" wheels. Most kids transition to 24" between ages 9 and 11, depending on height. A 24" wheel bike is the last step before adult-sized bikes, so getting this fit right matters. At this age, proper saddle height means the child's leg is almost fully extended at the bottom of the pedal stroke with a slight bend at the knee — the same principle used for adult bikes. Standover clearance should be 2–3 inches. Many 24" bikes come with adult-style components, which is ideal since these kids are developing adult riding habits.
Measure head circumference at the widest point across the forehead. Most brands size: XS (50–53 cm), S (53–56 cm), M (56–59 cm), L (59–62 cm), XL (62+ cm). Kids helmets typically start at 47–50 cm. Always try before buying; fit varies by brand.
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Giro
S 51–55 cm, M 55–59 cm, L 59–63 cm
Bell
S 52–56 cm, M 56–60 cm, L 60–64 cm
Smith
S 51–55 cm, M 55–59 cm, L 59–63 cm
Poc
S 50–54 cm, M 54–58 cm, L 58–62 cm
Lazer
S 50–54 cm, M 54–58 cm, L 58–62 cm
Kask
S 50–54 cm, M 54–58 cm, L 58–62 cm
Troy Lee Designs
S 53–56 cm, M 56–59 cm, L 59–62 cm
Abus
S 52–58 cm, M 58–64 cm
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