iirc @6pt used to get this, turned out it was from standing over top tube at traffic lights and having the tip of the saddle rub against the back of the bibshorts
They told me it was a known issue with the fabric on early core shorts, gave me a £100 voucher code to replace
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@mcmyk started
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iirc @6pt used to get this, turned out it was from standing over top tube at traffic lights and having the tip of the saddle rub against the back of the bibshorts