ind ▁is ▁a ▁front - side ▁gr ind . ▁ ▁List ▁of ▁gr inds ▁▁ 5 0 - 5 0 ▁gr ind ▁ ▁The ▁ 5 0 - 5 0 ▁gr ind ▁is ▁where ▁both ▁tr uck s ▁are ▁on ▁the ▁edge . ▁This ▁move ▁evol ved ▁from ▁the ▁horizontal - st ance ▁car ve ▁gr ind ▁ ▁in ▁po ols ▁and ▁was ▁taken ▁up ▁on ▁top ▁of ▁the ▁lip ▁by ▁such ▁sk aters ▁as ▁Jay ▁Adams , ▁Tony ▁Al va ▁and ▁St acy ▁Per al ta . ▁Also ▁called ▁" A x el gr ind ". ▁▁ 5 - 0 ▁gr ind ▁Pr on ounced ▁" F ive - Oh ". ▁In ▁this ▁man eu ver , ▁the ▁back ▁tr uck ▁gr inds ▁the ▁rail / edge , ▁while ▁the ▁front ▁tr uck ▁is ▁susp ended ▁directly ▁above ▁the ▁rail / edge . ▁This ▁move ▁is ▁similar ▁to ▁the ▁manual , ▁although ▁the ▁tail ▁may ▁be ▁sc rap ed ▁against ▁the ▁obst acle ▁as ▁well ▁as ▁the ▁back ▁tr uck , ▁which ▁is ▁not ▁considered ▁proper ▁on ▁a ▁manual . ▁ ▁N ose gr ind ▁For ▁a ▁N ose gr ind , ▁the ▁front ▁tr uck ▁gr inds ▁the ▁obst acle , ▁while ▁the ▁back ▁tr uck ▁is ▁susp ended ▁over ▁the ▁rail / edge . ▁It ▁is ▁similar ▁to ▁the ▁nose ▁manual , ▁except ▁performed ▁on ▁a ▁rail , ▁cop ing , ▁or ▁led ge . ▁This ▁move ▁origin ated ▁on ▁vert , ▁initially ▁in ▁the ▁form ▁of ▁Neil ▁Bl ender