Join Date: Dec 2007
Location: San Jose, California
Bikes: 2001 Tommasini Sintesi w/ Campagnolo Daytona 10 Speed
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1. 1-2mm shorter drive side is common.
2. The spokes regardless of length are competing to pull the rim to one side or the other - a rim that naturally needs to fall centered between the locknuts of the hub. The side that wins is the side with more tension. In a symmetrical wheel - both sides are even. In an asymmetrical wheel one flange has less offset and is closer to center and therefore need to carry more tension to keep rim centered between the locknuts.
3. For a rear asymmetrical rear - it is the shell flanges that have moved away UNEVENLY away from the center of the structure - not the rim. The rim is still centered between the ends of the locknuts of the hub.
Some educational brush up points for you to follow up on:
1. Simple physics. (A wheel is a pre-stressed assembly, not a rigid structure.)
2. Definition of dish:
- As an adjective - an appearance of dish. (Not brought to bear in the actual technical process of assembling a wheel.)
- As a verb - the act of centering the rim between the ends of the locknuts of the hub - or in some cases - the ends of the end caps of the hub. (Directly applies to the technicals of wheel assembly.)
3. What offsets are in relation to the center of something and how it influences things.
4000+ wheels built since 1984...
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
Last edited by mrrabbit; 04-14-12 at 12:09 PM.