Hey everyone,(adsbygoogle = window.adsbygoogle || []).push({});

I am trying to figure out how to calculate how much total force is being applied to the wheel axle on a bicycle. I'm focusing on the rear wheel for the moment. For the sake of simplicity, let's say that the bike and rider together weigh 100kg and that 60 percent of that is going to the rear wheel. Let's also say that the bike is traveling at up to 10 meters per second. I know that 60kg of force is being applied in a downwards direction on the axle , but I am uncertain as to how I calculate the backwards force being applied when traveling at that speed.

I wondered if it were simply the weight × the speed in m/s ? But this would give 660kg of total force on just the rear axle alone, and that seems rather high to me. And what about the traction of where the bicycle tyre touches the ground? Does that make a difference and if so wouldn't different tyre widths and different levels of inflation affect that.

If it's not already obvious, I am an amateur when it comes to engineering, so go easy on me. Any help is much appreciated.

P. S If your curious, I am considering what material other than metal might be used for the wheel axles, and would like to know how much force is being applied to them and hence whether the material would be strong enough.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# How do I calculate forces acting on bicycle axle?

**Physics Forums | Science Articles, Homework Help, Discussion**