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  • If you stand side-on to a steel framed bike and push down on the pedal, the bottom bracket will always flex out, as it will flex when you're pedalling - it's simply part of the nature of steel frames. It's only a problem if you don't like it, or if the frame is fucked (it'd be more than flexing then), in which case it's the manufacturers who are at fault, not the material. Maybe go for a long ride on a alu frame and see what you think? I've never ridden a alu fixed frame - I imagine the braking feels totally different.

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