Thread sizes on a Boardman 3XB Sport

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tomhallgarten

New Member
I have a Boardman 3XB Sport and am trying to fit a mudguard. I need to know the diameter of the threaded holes just above the rear axel - a 4mm screw is too small and rattles around in the hole and the 5mm screws that came with the mudguard are too big. Am I being stupid?
 
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