Well, (at least the green and orange) the QB's were made in Japan by Toyo, 
so I'd imagine that their current Taiwanese supplier has a different supply 
chain for frame parts than did Toyo at the time.  Secondly, the newer 
dropout is hooded, like the dropouts on the Clem and Appaloosa, which 
allows the dropout to be TIG welded to the stays rather than brazed.  I 
think it also allows the dropout to fit a wider range of angles between the 
stays without modification.  I'm not an expert in frame manufacturing and 
I'm not sure how the costs balance against the cost of doing a new dropout 
casting, but I'd imagine at least some of it is motivated by streamlining 
the manufacturing process.  

Finally, the new dropout has double eyelets whereas the QB ends had single 

On Wednesday, February 14, 2018 at 9:27:56 AM UTC-8, jandrews_nyc wrote:
> Just curious why the original QB/SO track end was redesigned...
> Does anyone know how the new one changes the flexibility of 
> gearing...isn't it still an 8 tooth difference while maintaining brake pad 
> position?
> Maybe it's so they could extend the chain stays?

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