Whats with the numbers after bike model names?

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?
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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But generally there is no consistency and it's down to the individual brand whether high numbers or low numbers are the higher spec. If you look at the rrp that gives you an idea.
Some (like Carrera) have different names for the same frame so for example the hardtails go Subway, Vengeance, Vulcan, Kraken and Fury.....but they could just as well all be called the Vulcan 1.0 through 5.0!
retired 9.6kg Carrera Kraken
The Carrera Hardtail combined thread - come on all you Carrera's!
The Sons Scott Genius RC20 build