I used BBs when I ran my 36" SXs. IIRC I ran about 8 oz per tire and they were great. I measured mine out on a small scale but like WT says, use a couple of shot glasses and you'll be fine. It's not an exact measurement as the BBs dispurse to where they are needed so as long as you have "enough," there really isn't a "too much." (within reason of course   )