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So. Calif.
2,800 Posts
Discussion Starter · #1 ·
I originally posted this in the "Components & Wrenching" subforum a few days ago, and thought it's worth cross posting here.

Basically, I checked and realigned my rear derailleur hanger with a Park DAG2 tool, reducing the misalignment from 10mm to 2mm (+/-1mm) per Park's method.

Even the original 10mm corresponded to "only" about 1.8º out-of-parallelism, so these are very small amounts.

I was very pleasantly surprised by how much improvement this made :)

I always thought RD shifting was fine, but didn't know what I was missing. I'm guesstimating up/down shifting is perhaps 15% faster, and a bit quieter too.

When I assembled my bike 18 months ago, I didn't have the DAG2 guage and it seemed overkill at the time ... now I know better.

I'm thinking that any rear der shifting complaint that isn't fixed by simple cable tension or limit screw adjusments, should have the rear hanger alignment checked.

I can't imagine a shop would charge more than $10 or so, if you don't want to spend the $60 or so street price on the DAG2.
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