DIMENSION OF ALUMINUM WITHOUT BEARING. 5.250" ODREPLACEMENT: BEARING: (62051RS) CAP (KX411690) CIRCLIPS (KX4116100)NOTE: MANY MODELS USE MORE THAN 1 SIZE IDLER OR REAR WHEEL, BESURE TO COMPARE THE SIZE FOR PROPER APPLICATION. AVAILABLE INOTHER COLORS: BLACK, RED, BLUE, MAGENTA AND PURPLE.