Christopher Pomering and I are named co-inventors of the passive seat-tube pivot in US 8,857,841 B2. My work also included developing IsoSpeed into a production product.
A pivot joins the seat tube near the upper frame junction.
The portion between the pivot and bottom bracket can deflect under loading.
The concept introduces seat-tube compliance while retaining the primary diamond-frame layout.
An explanation of the arrangement, not a prototype history or a performance promise.
My work connected the concept with product development at Trek. The original patent records the shared invention, while my development responsibilities included turning IsoSpeed into a production product.
Trek dates the technology’s introduction to 2012. The first Domane manufacturing program with Quest provides another view of the work, focused on the manufacturer and its engineers.
The 2016 Madone case examines a separate implementation involving tube-in-tube construction, analysis and rider testing.