If your route includes both pavement and dirt trails, Outdoor Gear Lab recommends a Gravel Bike . They are faster than mountain bikes on roads but more capable than road bikes on dirt.
If you want to go as fast as possible on tarmac, a Road Bike is the top choice. You might look at specific race models or Endurance Road Bikes if you want speed without the back-straining posture. what type of bike should i buy
A mix between road and mountain bikes; great for dirt or pavement. Commuting and fitness If your route includes both pavement and dirt
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