Originally Posted by
operator
Just a note... the Park instructions set a much more liberal standard than what really works well IMO. I got their DAG tool, and found my hanger was within 3-4mm, but still bent. According to their instructions, 4mm is sufficient. After straightening the hanger on my bike to beyond my ability to detect (some fraction of a mm) the bike now indexes better than when it was new in 2005. So don't trust the 4mm they suggest, it's IMO way too sloppy for current 10sp Shimano derailers.