Originally Posted by
hueyhoolihan
using two different length spokes for a wheel is sometimes necessary, sometimes it's not...
dishing is only necessary, and therefore different spoke lengths employed (maybe), when a hub's centerline between the flanges, when mounted, is not in line with the centerline of the bike's frame. dishing would then be called for, and possibly longer spokes on one side than the other, in order to bring it in line.
You are confusing the two aspects of dish...
Dishing is required of any wheel - centering the rims between the locknuts of the hub. (Verb and techincal)
When the hub flange offsets are asymmetrical, then the "appearance" of "dish" on each side will be different - and result in two different spoke lengths. (Adjective and non-technical)
=8-)
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Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life