I’d say don’t overthink it too much - 22-23kph on mixed gravel/road is actually pretty normal. Swapping those GR1s for something faster-rolling could help a bit, but it won’t be a night-and-day difference. Biggest gains usually come from consistent training and building up your engine, not just the gear. Stick with more zone 2 rides, keep an eye on your heart rate, and speed will come with time. Tires might give you a couple extra kph, your legs will give you the rest.
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