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700c?
No Sputniks but https://www.sjscycles.co.uk/rims-tape/0-kinlin-adhn-700c-622-rim-silver-40-hole/
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Do they have to be Sputniks and 40h? I've just built some wheels for Cycliste's tandem with 36h Velocity Chukker rims. They're reassuringly studly at over 600g a piece, and they should be pretty stiff given the relatively deep profile. The wheels and tyres, even with Hope hubs and a featherweight SRAM cassette, come in at nearly 4kg for the pair. If they're not up to scratch then I'm either going to have to give up eating entirely or chop off a limb.
Long shot, but does anyone know of a source of a silver, 40 hole Sputnik rim?