Bicycle Mechanics - Anyone ever build a wheel with an Ambrosio Nemesis rim, or measure the ERD of one?
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Online opinion (tm) tells me that the ERD is somewhere between 616.5 and 618, but a bike shop just told me 614. Anyone care to throw their hat into the ring? Right now I'm going with 617 as seen here:
For 32 spokes, 3x, I get this for the rear with 2007+ Record hubs:
Spoke length left: 301.6
Spoke length right: 299.6
And this for the front:
Spoke length left: 302.3
Spoke length right: 302.3
I'm using Sapim Laser spokes, and Race on the rear DS. I've chosen 301, 300, and 303 (front),
respectively. How's that sound? (one word answers acceptable!)
10-25-10, 09:48 PM
ERD = 617
ROUND DOWN!!! Use 12mm nipples.
10-25-10, 09:54 PM
302.00 Rear ND
299.92 Rear DS
Some here might suggest going 299.00 on the rear drive side.. These hubs have very extreme offsets...using 12mm nipples that allow a MM of spoke past the top will accomodate the lenghts as-is.
I was going by the advice of he whose name shall not be taken in vain, the great Sheldon Brown. He noted that he usually rounds up in his wheelbuilding tutorial. Almost everyone else on the internet seems to round down though. Unfortunately the Sapim Race spokes only come in even lengths, so I'm going to have to stick to 300 DS unless I want to pay 50% more per spoke. I am using 12 mm nipples. I've actually not seen shorter ones (though I have not sought them out).
I don't build enough wheels to have a preference for spoke length, and kind of think that 1 mm this way or that won't make much of a difference. This may be especially true of the kind of wheels I am building. Maybe if I were putting together some low spoke count bling that needed crazy tension to be trued, I'd have to be more careful.
10-26-10, 10:26 AM
302 and 300...should do it.
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