ALL THE PROS RIDE CASSETTE HUBS AND YOU SHOULD TOO!! SEALED BEARINGS OF COURSE. NO MORE TIGHT SPOTS IN YOUR CHAIN AND NOW THERE ARE MORE AND MORE GEAR RATIOS AVAILABLE. CHECK OPTIONS ABOVE. PICK ALL THE OPTIONS YOU LIKE AND THE PRICE WILL BE RIGHT THERE FOR YA. WEIGHT = 1 lb 3 oz (with chromoly 14mm axle) BELOW IS THE CHART SHOWING HOW TO MAINTAIN A NORMAL GEAR RATIO: IF YOU ORDER A 9 TOOTH COG YOU SHOULD USE A 25 TOOTH SPROCKET IF YOU ORDER A 10 TOOTH COG YOU SHOULD USE A 28 TOOTH SPROCKET IF YOU ORDER A 11 TOOTH COG YOU SHOULD USE A 30 TOOTH SPROCKET IF YOU ORDER A 12 TOOTH COG YOU SHOULD USE A 33 TOOTH SPROCKET IF YOU ORDER A 13 TOOTH COG YOU SHOULD USE A 36 TOOTH SPROCKET IF YOU ORDER A 14 TOOTH COG YOU SHOULD USE A 39 TOOTH SPROCKET IF YOU ORDER A 16 TOOTH COG YOU SHOULD USE EITHER 43,44,45 TOOTH SPROCKET.