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11-14-14 | 10:41 AM

#7

FBinNY

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Joined: Apr 2009

Posts: 39,897

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From: New Rochelle, NY

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Quote:

Originally Posted by BigAl36

I am working on building a set of Araya 700c 2w rims with Shimano 105sc hubs. Applied the above methodology and came out with 520mm. 250m spokes on each "pole" with 20mm gap in the middle. Everything I that I have been able to find about this rims suggest 611mm

What am I doing wrong?

I have no idea, but a 700c rim should be a hair under 640mm in overall diameter (to rim edges). The depth to to the nipple seat is a few millimeters less than the overall depth of the rim. Allowing for the head of the nipple, you'd subtract 3mm more. So if the rim is about 20mm deep (not saying it is), you should be coming up with something close to 640 - 2x12 mm or about 616mm ERD.

I have no idea how you got to anywhere under 600mm unless they were very deep rims.

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