Originally Posted by
Scooper
As far as the one-piece Ashtabula crank conversion is concerned, Pastor Bob did that conversion with his Super Sport,
"Sporty"...
He's probably preaching his sermon about now, but will likely chime in when he sees this.
Sermon is done. And I have a break before heading to my youth program later. 26.8 is the correct size. Sporty wears a SR Custom Campy copy supporting a Brooks Professional.
The crank conversion begins with an adapter made by FMF or Truvativ, which is bolted into the over sized BB shell. Then it is hit and miss finding the correct length cartridge BB (I've never found a traditional BB which works in the adapter) to fit your crankset to the Super Sport frame. BB width is very dependent on the crankset, the the way the stays spread from the BB shell, and whether you plan to use a double or triple. Sporty has a 119mm Phil BB and runs a triple.