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Close enough to not make difference in bike design. Reynolds themselves measure a figure of 207 GPa for ALL their steel tubing regardless of quality.
https://www.reynoldstechnology.biz/wp-content/uploads/2015/08/rtl_steel_alloys_extract.pdf
7.8g/cc densities for all too:
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Makes me question what the point of any frames being made out of 853 is then?
I guess comes down to perception bias. Some will perceive 853 rides better, some will perceive there is no difference (usually before even test riding, looking at how tubing has been used, geo or other factors such as intended use or rider weight).
I have had 4130 frames that ride superb (Town Crier) and 853 frames that were terrible (Mk1 Sir9/Mk1 Solaris), but thats just my experience and based on my own perceptions.
I don't think that's correct