Review on Park Tool DAG 2 2 Derailleur Alignment by Bruce Marable

Super simple and extremely effective. Tried everything, new derailleur, cassette and chain, all high end items and still sloppy shifting. Never considered the problem of combination. The bike has never crashed or fallen. Found a video on YouTube about hanger alignment and the tool used to check and fix problems. Thanks to Revain, my new tool arrived and I was amazed at how easy it was to check and fix any misalignment. The instrument itself is well made and well shaped. No complaints. You would think that the bike shop where I bought the bike would have checked it before delivery? Find out. If you are a serious racer and love mechanical perfection buy this tool now. Of course, there are many other vendors that offer modeling tools, but as we all know, Park Tools is the best and most reliable starting point.