aarn: boring 42th chainring v2 [bicycle]
In the last few weeks my beater bike has turned into a mechanical breadboard for some of these projects that I have been sitting on. About a year and a half ago I developed an improved tooth profile as part of a series of new chainrings that I designed/engineered for Nao’s project 3RRR. The 3RRR chainrings were prototyped and then I made some revisions to the tooth profile - so about eight months later I decided to test the limits of my CNC router by designing a really simple chainring for my bike using the new profile and making it in-house.
The tooth profile on this ring was designed to occupy a greater percentage of the underutilized space between the rollers in a track chain. It is a great improvement over my last chainring (see: aarn: 42th prototype track chainring [bicycle]), and runs pretty quietly. Building on the idea of developing my own tooth profile from scratch has allowed me to manipulate the geometry in a very unconventional way to try and get the best running chainring possible. I think that I’m going to make some more prototypes to refine the geometry and then start the search for a new manufacturing house for the 3RRR product line again.
