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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
Genuine monoposto subframes are generally aluminium alloy and are much lighter, but they cannot take the weight of a passenger - there's also no mounting points for the passenger footpegs either!
Picking up a cheap second-hand biposto subframe shouldn't be a problem though.