Product Description
Sm3 Radium Helmet is available now from Knobtown Cycle, your Kansas City motorcycle parts specialists.
Key Features
- Conforms to both DOT and ECE 2206 standards, ensuring safe use worldwide.
- The patented visor release system minimizes forces on the neck by releasing the visor with a precisely calibrated amount of force during impact.
- Features 10 inlets and 7 exhaust ports for maximum airflow and effective heat transfer, keeping you cool during intense rides.
- Alpinestars’ patented low-friction coating on the EPS liner reduces rotational acceleration forces from oblique impacts.
- Mimics the brain’s natural defense system with a slip-plane layer for added protection.
- Thermo-injected polymer blend with variable thickness delivers optimal impact protection without compromising on weight.
- Engineered for ease of use, offering a snug yet breathable fit for extended riding sessions.
Product Specifications
- Part Number: 482-001812X
- Brand: Alpinestars
- Weight: 7.58 lbs
Available at Knobtown Cycle
Shop online or visit our Kansas City showroom. Fast shipping available on all orders! Free Ship to Store!
Part Locations
| Location |
Available |
| Ashley (IN) |
0 |
| Elizabethtown (PA) |
0 |
| Boise (ID) |
19 |
| Midway (GA) |
19 |
| Fresno (CA) |
0 |
| Jessup (MD) |
0 |
| Midlothian (VA) |
22 |
| National Total |
60 |
Stock levels last updated: March 1, 2026 5:07 PM
Professional Installation Available
Knobtown Cycle offers professional installation services. Contact us via a service request to learn more.
Thank you for Shopping at Knobtown Cycle!
When you shop with us, you’re not just buying motorcycle parts — you’re supporting a small, family-run business rooted right here in the heartland of America. Every order helps us keep riders on the road and fuels our passion for serving the motorcycle community.
From all of us at Knobtown Cycle, thank you for choosing local and riding with us.
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