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My Haynes shop manual shows a Bonneville frame that consists of 2 pieces... front part and rear sub-frame. At what point did the frame become one single piece? Was it prior to the OIF frame?
Best to all,
GCoastDave :cool:
 

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If I understand the question first 1 piece bonnie frame was 1971 model. 1959 thru 1970 had a front and seperate rear section that was a bolt on
 

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the oil in frame frame(?)is the first one piece (all welded) frame made by triumph for the bonneville(in fact it was a common frame for bsa and triumph as they were financially the same company)in1971
ben
 

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that's true and i know the whole history...one of the last chapter of the "splendor and misery of the british motorcycle industry" and also ,arguably, a small chapter in the history of the technocratic arrogance and blindness.
ben
 
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