My blog, MN Bike Trail Navigator. It's winter fatbike season now, but Spring brings gravel content that's Minnesota specific. Visit here:
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I don't think anyone is trying to create niches - as Whit says these bikes have always been around. I think what we're seeing is people being exposed to so much on such a micro level that we're just trying to come up with terminology to cover subtle, vague, and subjective boundaries. It's like the hairsplitting you get it certain musical genres - electronic stuff being the worst. Is this record minimal techno or microhouse? Who knows, ask the guy that recorded it!
In the case of my most recent bike, I think gravel grinder is a great way to describe it. It has a really low bottom bracket which would distinguish it from other cyclocross frame, and the bottom bracket is low since it gets ridden on gravel roads, which we mostly have around here. And it's built more for comfort than speed - for grinding out the miles. So the name makes sense to me! But I know the subtle differences - if you ask me the difference between freeride, enduro, and all-mountain bikes all I can do is shrug - it all sounds like marketing to me, but that's because I don't experience that kind of riding on a subtle level.
Yeah, I just don't get the angst. Was Jack Taylor making a niche with the rough stuff bikes? Was Bianchi making a niche with Volpe (and Axis, and Project 7)? Was Bruce Gordon making a niche with the Rock n' Road?
We have the luxury these days of being able to pick from all sorts of bikes these days, and a lot of its being driven from the bottom up.