I've got to say. After putting on the eai gold medal cog with the izumi super toughness chain being pulled by the sugino zen chainring has been an amazing combination. I was hesitent at first because of the cost but 175 miles later. ITS SMOOTH!!!
I'm very happy I bought this.
It's suprisingly quiet. But man oh man. It's soild as hell.
Not saying that the combination was bad that I had before. It wasn't. Not in anyway.
This one though feels so nice, that I want to move further away from work so I could ride longer.
Socks