IM NEW TO THE OVAL CARPET IM TRYING TO GET MY SON AND MYSELF INTO IT.WE HAVE RAN FOR A FEW WEEKS AND SEEM TO BE DOING OK. MY QUESTION IS ABOUT THE WEIGHT OF TRINITY 4CELL SPEC PACKS.I HEARD THERE ARE NEW ONES THAT WEIGH 240grams VS 220g.the packs i bought about a month ago weigh 220g.ARCOR SHOWS THE RULE TO BE 245g and ive seen racers with the heavier packs 240g.