I suggest you choose a mountain bike, as your weight can't adapt to riding a road bike in a short time. Don't laugh, because of the distance you said, I was thinking that if you have a flat tire in hot weather, it will be very painful.

The weight of road cars is much lighter than that of mountains. My Merida Phantom is only 9KG, and the standard weight of international competition should not be less than 6.8KG.

See how much you are willing to pay, whether it is mountain or highway, the price varies greatly, from 500 to ∞. It is suggested that the price in mountainous areas should not be lower than 2,000, and expressway should be above 4,000. Brand words will be produced in Merida and Simano. The price and choice are quite large. Giants are famous, but things are really pleasing.

That's all. I wish you success in losing weight. Like you, I'm in the process. ......