so i bought a pair of used '02 i believe north shore 5 bolt cranks. I was wondering how i can tell/measure the bolt diameter size of the chainring spider cause i am replacing the chainring with a 42t. I brought it to my local bike store and surprisingly they couldn't find the diameter of the spider. I'm assuming it's a 94mm or a 110mm. Does anyone know a good way to measure the diameter? Where do i start measuring on the spider to get the correct measurement? i dun wanna end up buying the wrong chainring/bash guard size so any help would be really appreciated. thanx