Cannondale
The Super V and various incarnations, were the first true "all mountain" bike and they coined the whole freeride Scene. Their hard tails are superb too and we see way too few on here. The ride quality for a fat tubed ally hard tail bikes area revelation, stiff, but compliant and won't beat you up, they very rarely break either! They got is right, where Klein got it disasterously wrong. I have a custom painted F1000 HT and it's superb to both ride and good looking to boot.
I guess one of the problems in the Retro scene with Cannondale, is that they were so far ahead of their time, they're still not seen as retro!
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