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729 might be too wide for max. 50mm tyres, though?
29mm internal with 50mm tyres is just 25mm tyres on 15mm internal rims scaled up, and if anything the modern received wisdom is that a rim internal width of 60% of the tyre width is a bit on the skinny side. I've got 700×35 Marathon Racers on 38mm external (so about 30mm internal) rims and they're fine.
@thecycleclinic 729 might be too wide for max. 50mm tyres, though? But like I wrote earlier, this won't be for offroad use. I'm almost decided on DT FR600. I also came across Ryde/Rigida Andra 40, but the availability looks a bit spotty.