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Kimmo
gbj_tester
They have much better bracing angle than normal rims of similar depth, I've seen tandemists using the WH-7700, which is essentially a #tartmode WH-540.
The WH-RS20 is much more conventional and works fine at 16F/20R with spokes of the same cross section as CX-Sprints, so there's that. Shimano don't specify a rider weight limit, but we can be sure they don't want a lot of complaints from people up to 120kg, so there's a good bit of wiggle room for people a lot lighter than that.
Well, stiffer anyway.