These are the Response Racing 3.8 Tires by Traxxas.                
                                                                               
FEATURES: Soft compound narrow profile short knobby design                     
          Traxxas, Revo, Response, 5.75x2.76-3.8 printed on tire               
                                                                               
INCLUDES: Two tires with foam inserts                                          
                                                                               
REQUIRES: Wheels, TRAC5372, TRAC5373                                           
                                                                               
SPECS:    Width: 3.2" (82mm)                                                   
          Diameter: inner diameter 2.8" (72mm), outer 5.3" (135mm)