I bought it expecting to do some climbing around here last summer but this is the first time I've even used the 20t. I also picked up a 44t chainring om ebay today since I run road doubles, which should be the right size so I can have 51x17 and 44x20, which will make a much better combo. Thinking about grabbing a new dingle too, 17x21. I'm sure I can find use for two. It's basically my favorite bike part at this point.