# Bike Think

## Examining the Science behind Bicycle Performance

## Chainstay bridges

## Chainstay Bridges

This is a brief look at the stress and stiffness effects of chainstay bridges. I applied the horizontal torque load from pedaling to my beam FEA model with and without a chainstay to compare stiffness. The FEA shows about a 5% increase in stiffness with a chainstay.

However, there appears to be no significant change in stress levels. Real stress levels would be sensitive to local stress concentrations at all joints and corners, so it is difficult to definitively say that there is no difference. The FEA stress plots below give a general sense of the stress patterns under pedaling loads.

“I applied the horizontal torque load from pedaling to my beam FEA model with and without a chainstay to compare stiffness. The FEA shows about a 5% increase in stiffness with a chainstay.”

This should read:

“I applied the horizontal torque load from pedaling to my beam FEA model with and without a chainstay bridge to compare stiffness. The FEA shows about a 5% increase in stiffness with a bridge.”

Hello. Greetings from India.

Your website has been very informative without being biased. It has given me different ideas on concepts that I otherwise thought I knew thoroughly. Thank you for your contribution.

I am trying to build a bicycle model on a 3d modelling software ( solidworks or autodesk inventor ). I see that you have made bicycle models or at least parts of a bicycle in order to perform stress analyses on them. I would like to contact you regarding modeling a bicycle and discussing about various aspects regarding stress distribution based on applied loads.

Thank you for your time.

Gokul.