if you have a older park derailleur alignment tool you will find that the alignment boss is quite large. the large boss interferes with the smaller hangers on many new road bikes. a quick fix is to grab a axle washer and slip it on over the stud. this will reduce the diameter of the boss and give you some room to work with. for example trek madone hangers and the DAG 1 dont play well but slip on the washer and its good to go. the pic above is for illustration. the washer i have is larger than normal and the tool is the newer DAG 2
I am a humble, home mechanic. I bought a DAG two seasons ago thinking that I would hardly ever use it, but I wanted one anyway. It could well be my most-used specialty tool. I own several bikes, and various friends and neighbors bring me theirs. Misaligned hangers are probably the number one cause of poor shifting that I see. I end up using that tool a lot.
ReplyDeleteyes step 1 of any RD adjustment is hanger alignment. same with the FD height and rotation
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