531 competition was quite late on its actually more basic than it sounds with just the 3 main tubes butted. If it is SBDU as the seller thinks the frame number should be different to Nottingham or Worksop frames.
@Dibble started
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531 competition was quite late on its actually more basic than it sounds with just the 3 main tubes butted.
If it is SBDU as the seller thinks the frame number should be different to Nottingham or Worksop frames.