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@karma
I think they're metal, I'll have to check. It's an old Shimano UN72.
It's not that I don't like it, it's comfortable and forgiving, I was more curious as to whether there was much difference between frames or if quite a lot of flex was simply due to it being steel.
Last time I rode steel it was an old GT mountain bike, which was heavy and stiff. Since I've come back to riding after a hiatus of about a decade, I've ridden an aluminium hybrid and my steel frame.
Seeing the flex made me wonder what sort of variations there were. As I said mine was cheap, only £130 from SJS and a road frame at that. As many ride track frames and frames built by the likes Bob Jackson and Mercian I thought I'd see what others experience is, which seems to be that steel frames have quite a lot of flex around the BB area. I don't think mine's broken.