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Let's be serious. At 42-11 90rpm you'll be able to go roughly 45kph. Which is great for off-road and adequate for urban commuting. If you have a fancy Campagnolo Ekar 13 speed setup with 9t cog and 44t chairing you can even go 55kph which even on the road is rare outside of steep descents. So yes 1x is probably enough for anyone but racers.