DIMENSION OF: ALUMINUM W/OUT BEARING 7.500" ODREPLACEMENT BEARING (62052RS) CAP NONE CIRCLIP (KX4116100)NOTE:MANY MODELS USE MORE THAN 1 SIZE IDLER OR REAR WHEEL, BESURE TO COMPARE THE SIZE FOR PROPER APPLICATION. AVAILABLE INOTHER COLORS: RED, BLUE, MAGENTA, PURPLE AND YELLOW.