I saw a photo of what somebody was calling their Pivot Mach 427. Think somebody posted it to Pivot's Facebook page. Looked like a Mach 4 with 650b or possibly a 429, again with 650b. Anybody seen one of these and can tell me which path they took to get to the 427 and how things are set up? What tweaks were made. Sounds like an epic 8 to 24 hour enduro bike to me. Thoughts?