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I think you can get a bike that'll do everything, just not at >50kph! I'm happy to have a compromise bike that'll get me up anything and thereby live the #sluglife on the road.
If one absolutely need to pedal at 60kph or whatever but also wants to ride up proper gravel hills then the only option is the venerable triple. But I think most people would just be better off with two bikes.
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That depends on your definition of everything.
Mine has 38mm tyres (G-Ones), 700c wheels, and a compact road group (smallest gear 34-28). That's plenty to get me around Hertforshire's gnarliest bridleways, and fine for 'gravel' based Peak District trips. Conversely I commute 10 miles to work on it, and can happily sit in a bunch lapping Regent's park at 22mph.
Would I road race on it? Nope. Would I race CX on it? Possibly, but probably with a 650b wheelset and proper knobbly tyres. I think that anything that requires <1:1 gearing has fallen out of scope for a 'gravel' ride tbh. Caveat that I only have experience of riding gravel in the UK and understand that it's a very different beast in the US
Because I was convinced spending fuckload of money would get me a bike that would do everything....