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Whats with the numbers after bike model names?

UlyssesUlysses Posts: 104
edited October 2013 in MTB beginners
Maybe a n00b/stupid question.
I know a lower number is lower spec'd than a higher number. I was really wonder how it came about to be 5.9, 6.9 etc, and what the .9 means over say using .0 or .5?


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