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.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* TPI: 67 TPI* **WEIGHT:*** 26x2.25 560g* 27.5x2.1 550g / 27.5x2.25 595g* 29x2.1 585g / 29x2.25 630g / 29x2.35 705g**ETRTO:*** SCM504A: 57-559* SCM515: 57-584* SCM516: 57-622