The Physics of Impact Deflection vs. Abrasion Resistance
Protective motorcycle riding gear fulfills two distinct safety objectives during a crash: Abrasion Resistance (preventing road rash during high-speed tarmac slides) and Impact Energy Attenuation (absorbing kinetic force before it shatters bone structure).
1. CE Standard EN 1621: Kilonewton (kN) Force Transmission Limits
Under the European standard EN 1621-1 (Limb Protectors) and EN 1621-2 (Back Protectors), a 5 kg striker drops onto the armor sample with 50 Joules of kinetic energy. Sensors measure the peak residual force transmitted through the protector:
- CE Level 1: Transmitted force must remain below an average of 35 kN (or 18 kN for back protectors).
- CE Level 2 (Superior Protection): Transmitted force must remain below an average of 20 kN (or 9 kN for back protectors)—providing nearly double the shock absorption capacity of Level 1.
2. Non-Newtonian Viscoelastic Polymers (D3O, SAS-TEC, Rheon)
Unlike old rigid plastic shells, modern viscoelastic armor is soft and pliable during normal riding. Under rapid impact stress, the polymer chains lock together instantly to form a solid protective lattice that absorbs and disperses impact energy outward across the entire pad before returning to a flexible state.
3. Leather vs. Technical Cordura: Slide Time Ratings
- 1.2mm – 1.4mm Full-Grain Bovine Leather: Capable of withstanding 4.5 to 7.0 seconds of continuous sliding on coarse asphalt at 60 mph before tearing.
- 500D – 1000D Cordura Nylon: Provides 1.5 to 2.5 seconds of abrasion resistance—ideal for urban and adventure touring with lower slide velocities.