Sizing Charts

Motocross Gear & Dirt Bike Apparel Sizing Charts

Welcome to the official sizing chart hub for motocross, dirt bike, BMX, and action sports gear at BTO Sports. Getting the right fit is critical not only for your comfort but also for your performance and safety on the track, trail, or street. Whether you’re gearing up with a new helmet, boots, gloves, or protective gear, our size guides make it easy to get it right the first time.

We’ve compiled detailed sizing charts for all the top brands in the industry so you can ride with confidence knowing your gear fits as it should.

Browse Sizing Charts by Brand

Alpinestars Sizing Chart

Premium motocross gear including boots, gloves, and body armor.

Arai Helmets Sizing Chart

Use this guide to properly size your Arai helmet for a secure, comfortable fit that delivers premium protection on every ride.

Fox Racing Sizing Chart

Sizing for helmets, pants, gloves, and jerseys.

Seven MX Sizing Chart

Lightweight gear with a second-skin fit. Great for race-day performance.

Bell Helmets Sizing Chart

Detailed helmet sizing for maximum safety and comfort.

Leatt Sizing Chart

Sizing charts for neck braces, body armor, and helmets for full protection.

Fly Racing Sizing Chart

Find your fit across casual apparel, jerseys, gloves, and boots.

Troy Lee Designs Sizing Chart

Race-proven gear with size guides for helmets, pants, and more.

Thor Racing Sizing Chart

Reliable motocross sizing for jerseys, helmets, and gloves.

O’Neal Sizing Chart

Find your fit for O’Neal’s helmets, gloves, and boots with these guides.

Fasthouse Sizing Chart

Stylish and functional sizing for BMX and motocross riders.

Asterisk Knee Braces Sizing Chart

Ensure your Asterisk knee braces fit snug for optimal support and safety.

6D Helmets Sizing Chart

Use this guide to properly size your high-tech 6D helmet for comfort and safety.

Gaerne Sizing Chart

High-quality Italian boot sizing to get the perfect fit for motocross and enduro.

Sidi Boots Sizing Chart

Advanced sizing for high-performance motorcycle footwear.

Shoei Helmets Sizing Chart

Precision-fit helmets start here. Use the Shoei chart for best protection.

Pod MX Sizing Chart

Lightweight, adjustable knee braces designed for all-day comfort and protection.

Looking for a brand not listed here? Email us at cs@btosports.com and our product experts will help you find the right sizing info.

Why Proper Sizing Matters for Your Riding Gear

Wearing properly fitted gear improves safety, control, and comfort. Ill-fitting helmets, boots, or braces can reduce protection during crashes or impair mobility while riding. Whether you’re a beginner or a seasoned rider, correctly sized gear from trusted brands gives you the confidence to perform at your best.

Key Sizing Categories

Helmets: Use our brand-specific helmet sizing charts to find the right fit. Explore our helmet collection.
Boots: Proper fit enhances control and reduces fatigue. Browse our dirt bike boots.
Protective Gear: Chest protectors, neck braces, and knee braces require a snug, accurate fit. View our protective gear collection.
Jerseys & Pants: Comfort and mobility start here. Check out our jerseys and pants collections.