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Yeah it’s definitely heavier than it needs to be/would be if I used seat stays. If I could bend then I might be tempted to try chainstays as they are available in the same ovalisation.
That said, I don’t think it makes enough difference to the overall weight of the frame that I need to worry about it and when I was building the frame for my mate I initially did a set of actual Zona seat stays which I built into a wishbone piece that’s shaped for 130 or 135mm spacing and when I tried to tweak it in to 120mm I kinked the stays with surprisingly little effort so knowing he was planning on using a rack mounted child seat I actually got a bit concerned they were not going to be up to the job.
I guess the weight difference between beefier seatstays and fork legs would be a fair bit less.
Also, the ‘steerer tube’ bit isn’t actually a steerer tube, it’s a bit of 25.4mm plain gauge top tube so that helps keep the weight down.
I love steel. After building my mate his all road fixed I decided that I needed something like that and that I could condense three bikes into one so chopped the seatstays out of my road frame, replaced them with the same stuff I used on my mate’s frame, dimpled the chainstays and chucked all the good bits at it.