Nov 16, 2022 · Rider: Size and Ability. The top speed of SSR 125 is going to be slower if the rider weighs more because it takes more work from the bike, while the bike and engine maintain the same ability/capacity. The heavier the rider, generally the lower the SSR 125 top speed is going to be. Since this is a pit bike, there can be a wide range of rider Sep 18, 2022 · How fast does 125cc go in mph? How fast does 125cc go in mph? Well, that depends on the bike. But on average, a 125cc bike will go around 60 mph. Of course, that can vary depending on the bike, the wind, and the terrain. scULdnV.