SheldonBrownBlog

An idler is a freewheeling sprocket that can take a bicycle chain around a corner, or adjust chain slack. Derailer pulleys are the most common example. In a chain run which is driving or braking, something more robust is needed. We discuss idler type and location, and how to convert a bicycle freewheel into a robust idler.

Electric cars are too quiet. Bicyclists need to hear them coming, and ShelBroCo has solutions that appeal to the frustrated Tesla driver. Catch our unbeatable deal before tariffs force us to raise prices!

(Best experience with a phone is with it held horizontally).

Reader Alexander Bailey has sent in suggestions to list several tire/tyre sizes which have come into use on BMX and Freestyle bicycles. Some are in widths unseen before and there is even one bead seat diameter which used to be very rare. These sizes are now included in our page on tire sizing, and its British English version on tyre sizing. I have also made a few updates to the text reflecting new trends.

 

The frame of my Raleigh Twenty folding bicycle collapsed, bending the upper hinge plate when the nut underneath the hinge stripped its threads or unscrewed. Though this damage seemed hopeless at first, an excellent repair proved possible without using any special bicycle tools, and a substitute nut proved to be easily available! Read about it here!

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More diagnostics. Listen, your bike might be telling you something!

We’ve described new features and interface updates. https://sheldonbrown.com/deshaker.html

New references, broken links fixed. https://sheldonbrown.com/rollerbrakes.html

Electronic attitude and heading reference system with stability, ABS and traction control. Powered steering assembly. Once again, ShelBroCo is off the front with new technology. Read about it here!