There is a tab (circled in red) on the chainstay of my 2009 Cannondale Tandem. Does anyone know what its intended function is for?
Thanks
by aaronm007
There is a tab (circled in red) on the chainstay of my 2009 Cannondale Tandem. Does anyone know what its intended function is for?
Thanks
by aaronm007
3 Comments
It’s for a reaction arm for a drum brake.
Let us consult the book of Sheldon.
https://sheldonbrown.com/tandem-brakes.html
That’s for internally geared or coaster brake hubs that have a little arm to keep them rotationally fixed. For example this Sturmey coaster brake hub
https://preview.redd.it/we4qh1pcou2g1.jpeg?width=600&format=pjpg&auto=webp&s=407df5074bb7bddbad00dab8bab3422d8879e2bf
Drag/drum brake, a common third brake found on tandems due to their increased weight.