just an example... don't forget to order the right size to fit the diameter of your frame. Otherwise ordering the largest size and shimming with strips cut from an old innertube also works!
I ordered the K-Edge one, expensive for what it is but it's well made and looks good. I'm in the UK and ordered from Wiggle(who ship world wide) but I do happen to know that Competitive Cyclist in the US sells them.
The dogfang will only work on bikes with a standard round seat tube. If your bike has a manipulated or large diameter seat tube as it nears the bottom bracket, the dog fang won't work. In that case, a K-Edge (or one of its imitators) mounted to a braze-on FD will work.
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