Moderately aggressive tread ''Scaler CR'' and ''Duratrax C3'' white lettering on sidewall Duratrax C3 compound compares to the Pro-Line M4 super soft, and the AKA Super Soft compound 1.9'' Scaler CR Tire (2) C3 Duratrax Dimensions: diaouter: 119 mm diainner: 1.9'' Width: 42 mm