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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..)

people claim that 853 rides nicely.
What is said is that the joints in 853 are stiffer due to the air hardening qualities of 853 and perhaps that affects the ride ?

i can't say anything since i've not ridden an 853, but if it goes by previous claims with other tubesets, the ride quality is more to do with who made it and how they made it.