With a road bike, you are usually using a wide ratio gear box. With that, you wait while the crank winds up. If you have at least four gears close ratio, you ride the top of the torque curve. So you get to top speed more easily. But 110 MPH is pretty good for an old British bike. When you are at that speed, it takes a lot of horsepower to get more speed, because of the wind resistance. You would probably go faster if you fitted a fairing. But why would you bother ?