you are much better off takeing the bike along. there are a few sizes, lenght mostly, and two type of anchors. one fits snug with a knurled section the other a 'key'
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk