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Didn't say 853 wasn't better than 631, it is as it makes a slightly lighter frame. However, would anyone be able to notice in a blind test ride? (although a blind test ride sounds a bit dangerous..)

It's obvious isn't it? 531 is, as we all know, awesome. But 631 must be better as it has a higher number. Therefore 653 is better again, 753 is beyond awesome and then we've got 853 which is just SO FUCKING UNBELIEVEABLE and finally 953 which is THE FINEST STEEL TUBING IN THE KNOWN UNIVERSE.