51x18 = 6 skid patches @ 74.4" (12 patches if you're ambidextrous - the beauty of an odd chainring) http://www.bikecalc.com/skid_patch_calculator
@Rik_Van_Looy started
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51x18 = 6 skid patches @ 74.4" (12 patches if you're ambidextrous - the beauty of an odd chainring)
http://www.bikecalc.com/skid_patch_calculator