bpStealth Derailleur Hangers
The earlier model bp-2 requires a VERTICAL derailleur Hanger. This model was distributed between 1998 and 2004. These frames have an aluminum insert in the seat tube and head tube.
The modified model bp-2 Stealth requires a HORIZONTAL derailleur hanger. This model was distributed between 2004 and 2006. These frames do NOT have alloy inserts in the seat tube and head tube. The seat tube and head tube are all carbon.