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....You should be able to find out their weight online (apart from actually weighing them on accurate certified scales as I also did to check mine).
The seller should have kepts the weight labels to pass on (as I would if selling mine).
I've still got my powdercoated Monza 18's in storage and also included on my insurance along with my OZ's so I can ride on either without concern.
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8.9kg light enough me thinks.