T he RPHA 70 ST represents HJC’s top shelf sport-touring helmet and is an evolution of the original RPHA ST. HJC RPHA 70 ST Helmets. A supreme sport-touring helmet designed for any ride from quick commutes to cross-country cruises. The RPHA 70 Carbon is exceptionally compact and lightweight as a result of the Carbon Fiber Outer … The HJC Smart 10B Bluetooth Headset by Sena is designed to integrate with the following HJC helmets: RPHA 11 Pro Carbon ; RPHA 90 S Carbon; RPHA 90 S ; RPHA 70 ST Carbon ; F70 ; i10 ; i90; v90; … I’ve been regularly wearing the HJC RPHA 70 helmet for almost six months now and I think I’ve put in enough miles that I can now offer a full review.. Get the HJC RPHA 70 from Fortamoto. To … The RPHA 70 ST is exceptionally compact and lightweight as a result of the … A supreme sport-touring helmet designed for any ride from quick commutes to cross-country cruises. The HJC Smart 20B Bluetooth Headset by Sena is designed to integrate with the following HJC helmets: RPHA 11 Pro Carbon ; RPHA 90 Carbon; RPHA 70 ST Carbon ; F70; i10 ; i90; Features. Bluetooth 4.1; … Features such as a lightweight and rigid shell, an internal sun visor, and included pinlock ready visor and insert are just the beginning of the features packed into the RPHA 70 …