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Chak
jameso
In the vertical plane, not a lot. Esp in the rear triangle where it's often said to be. But Steel bikes are more likely to have lateral twist kind of flex and that accounts for a lot more comfort and ride feel (good and bad, depends how much etc) than most give it credit for or realise. Al frames can also do this too. The Arkose was always designed and ride-checked not to be too stiff against those lateral twist forces. Eg there's a big difference in that area between an Arkose and a couple of other Al frames I've ridden - some are silly-stiff imho.