Shop by Vehicle
Track Order
Contact UsAlpinestars RK Plasma Knee Brace Sizing
| Size | Knee (in) |
|---|---|
| SM | 3 7/8 - 4 1/4 |
| MD | 4 1/4 - 4 1/2 |
| LG | 4 1/2 - 4 1/4 |
| XL | 4 3/4 - 5 1/8 |
Sizing information is provided by the manufacturer and does not guarantee a perfect fit.
- Helmets
- Riding Gear
- PartsFilter by Vehicle:
- AccessoriesFilter by Vehicle:
- Gifts
- Luggage & Backpacks
- Tires
- 2026 Guides
- New Rider Guide
- Helmets
- Riding Gear
- ADV & Dual Sport Gear
- Airbags
- Beginner Gear
- Boots & Shoes
- CE Class A, AA, & AAA Gear
- Cold Weather Jackets
- Dirt Gear
- Gloves
- Heated Gear
- Jackets
- Jeans
- Mesh Jackets
- Pants
- Rain Gear
- Sport Gear
- Street & Cafe Gear
- Touring Gear
- V-Twin & Cruiser Gear
- Women's Gear
- Best Jeans Shop All
- Best Sportbike Gear
- Best V-Twin Gear
- Best Dirt Gear
- Best Mesh Jackets Shop All
- Best Touring Gear
- Sale
Menu
- Categories
- Full Face
- Modular
- Dual Sport
- Open Face
- Half
- Dirt
- Bluetooth Helmets
- Carbon Fiber
- Graphics
- Internal Sun Visor
- Helmet Finder
- Bluetooth Communications
- Shoei GT-Air II: $200 Off
- HJC up to 50% off
- LS2 up to 30% Off
- AGV up to 40% off
- Shark up to 50% Off
- Bell up to 50% Off
- Nolan up to 50% off
- Closeouts
- Open Box
- New Arrivals
- Best of 2026
- Buying Guide
- ECE vs Snell vs DOT
- Understanding Rotational Impacts
- Shop Gear By Riding Style
- Filter by Vehicle:
- Filter by Vehicle:
- Shop Accessories By Riding Style
- Tire Rebates Up To $70
- Alpinestars up to 40% Off
- Klim up to 40% off
- Shoei up to $200 Off
- Dainese up to 50% Off
- REV'IT! up to 40% Off
- HJC up to 50% off
- Bull-it Jeans up to 40% Off
- Shark up to 50% Off
- Nolan up to 50% off
- AGV Helmets up to 50% off
- Recent Markdowns
- Membership Savings
- Refer-A-Friend Discount
- All Open Box
Riders Preferred Membership
- Discover
- Help
