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Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,088
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
My S has a bip subframe - they all do. The monoposto choice only meant you got the single seat unit rather than the double - no difference in subframes.
As Jen says, only a few select models (SPS/R) had the proper ally subframe.