Old 08-20-2013, 03:11 PM
  #9260  
terry.sc
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Join Date: Aug 2008
Location: Stockport, UK
Posts: 982
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I use two 3mm holes opposite each other, to help balance out the loss of material. The foam in the tyre keeps any dirt out.
A UK specific problem, but having bigger holes also makes it easier to get the water out after racing in the rain.
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