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there is no minimum wt. for a disc.
I'm pretty sure 150 class tourneys have a minimum weight of 140 or 141. Japan Open is 151-160, or something like that. Never played either though, so that's just what I've read... in Disc Golfer I think.
Typically though, there is no minimum weight.
None of that is correct, the Japan open has a max of 150 except in open where the max is something like 159. No tournament anywhere has minimum weights nor is there any pdga rule about low weight discs.
I need a 10m ruler for putting
Well, look at page 39 of the current Disc Golfer.