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If you use the DT Swiss spoke length calculator you can tell it you're using the 411RR Assymetric and it'll calculate the lengths. Assuming the hub dimensions are correct, and using 12mm nipples, it gives 288mm NDS and 286mm DS.
Alternatively, if you can find out what the offset is on the assymetric rims (I couldn't online) then you can just tweak the flange spacing figures. So if it's a 2mm offset, that would make the flange spacings 18mm and 36mm rather than 16mm and 38mm.
Usual caveats apply about making sure the hub dimensions you get off the net are correct.
Can I ask for some help please? I'm looking to build a set of road wheels with Miche primato sintesi hubs. Dimensions courtesy of The cycleclinic are as follows...
Front:
Flange PCD = 40mm
Centre of flange - centre of hub = 34mm
100mm OLD
Rear :
Flange PCD = 46mm
Centre DS flange - centre of hub = 16mm
Centre NDS flange - centre of hub = 38mm
130mm OLD
The rims I want to use are DT Swiss 411RR. My issue is that i want to use the asymmetric version of the rim on the rear. Can anyone help with spoke length calculation? I don't trust myself to get it right. The hubs are 28h and I want to do x2 front and rear. Thanks.
EDIT rim ERD is 601mm