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Yes, it allows you to adjust the clearance between the rear wheel and the seat tube to ensure that you get maximum aeroz advantage. Of course, you need to know what the optimum setting is, which is hard to know in the absence of wind tunnel time.
Brommers-
ok, cheers, I thought it just made it easier to fit the wheel
from the Embacher Collection , all up for auction in Vienna on the 19th of May
catalog
biog says he's been collecting since 2003, wonder why the sale of the whole lot? peak vintage so time to get out or just bored and wants his house back?
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is there any reason/technical benefit ?