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A GuestI bought this to replace the outer chainring of my 12 speed road bike. I use the bike for city transportation and wanted to remove the outer chainring to keep my pants from getting caught in the teeth. Now i don't have to take time rolling up my pant leg and can just jump on my bike and go to a restaurant, market, whatever. I don't miss the outer chainring since i use this bike mainly for transportation and cruising purposes. Install was easy. I removed the derailleur too. Looks great and does exactly what i wanted it to.