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@gbj_tester
Bear in mind, children, that 700g rims are only 200g heavier than light-ish rims, about the same as the difference between a race tyre/tube and commuting rubber. In other words, pretty trivial. Also, 700g 50mm deep rims will build into strong and rigid wheels with half as many spokes as are needed for a very light and low rim, so the aero gain would be huge even if the rim is only a marginal improvement on its own, easily compensating for the weight penalty on any ride that's not an actual hill climb.