ALL THE PROS RIDE THEM 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. RIGHT SIDE OR LEFT SIDE DRIVE BOTH AVAILABLE. CHECK OPTIONS ABOVE. PICK ALL THE OPTIONS YOU LIKE AND THE PRICE WILL BE RIGHT THERE FOR YA.

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 A 43,44,45 TOOTH SPROCKET.