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do you have the rim?

karstb said:
Does anybody have the ERD for the ambrosio balance rims (700c) at hand? I found different values online, varying between 595 and 601mm, which is quite a difference.
Please help me!
If you have the rim you can measure it. Spocalc (which I'm guessing you are using) has the instructions. I have a Balance still in use on one bike (sturdy but heavy) but there's no guarantee it will match your rim
 

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this was posted on cyclingforums and is a response from the company on ERD:
Ambrosio Rim ERD: current rims

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Sergio from Ambrosio responded quickly to my email with the a table of
all the ERDs for their current rims; I'll post it here for future
reference for folks.

TABELLA DIAMETRI EFFETTIVI / EFFECTIVE RIM DIAMETERS

CERCHI PER COPERTURE / CLINCHER RIMS 28" 26"
FCS 28 590.0
EXCELLIGHT S.S.C. 600.0
EXCELLENCE 601.5
NEXUS 608.4
EVOLUTION 600.5
BALANCE ( 28" - 26") 594.0 543.0
EXCURSION 600.5
 
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