The perfect racer, thanks to its perfect combination of speed and grip. The Racing Ralph works perfectly on the rear wheel in combination with Rocket Ron. Tread design features a low tread depth in the central tread for high speed and low weight.* Numerous grip edges in the tread center for super traction and excellent acceleration.* Distinct shoulder studs for excellent lateral grip.* Good rolling properties and extremely quiet.PERFORMANCE Folding Version: With Twinskin extra rubber coating.**Features:*** E-BIKE READY: For motor assist up to 25kph* SIDEWALLS: TwinSkin which is an additional rubber coating to protect against cuts* Pressure: 1.80 - 3.70 Bar* Maximum load: 120kg* TPI: 67 TPI*WEIGHT: 680g**ETRTO:*** SCM520: 60-622* SCM521: 57-622