HELLO THIS IS A 1.500 INCH HUB KIT.....THAT IS THE STANDARD SIZE FOR MOST COASTER BRAKE BIKE HUBS .....THERE ARE BOLTS NUTS AND INSTRUCTIONS ON HOW TO INSTALL. WHAT YOU GET IS IN ( PHOTO # 3 ) ( NO SPROCKET IN KIT ) ( NO SPROCKET IN THIS KIT ) YOU MUST USE STOCK ENGINE KIT SPROCKET OR ANY OF THE STEEL 9 BOLT CHINESSE SPROCKETS FROM 32 TOOTH TO 54 TOOTH PLEASE NOTE WHAT I AM SELLING IS THE HUB ADAPTER... YOU USE THE 80CC OR THE 50CC STOCK ENGINE KIT SPROCKET .....HAVE FUN
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