Join Date: Nov 2003
Bikes: Leader home built hardtail, Diamondback Response
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You did not tell us where the spoke broke. If it broke at the elbow, then the normal reason is "too loose". The low spoke tension allows the strain on the elbow to work back and forth untill metal fatigue in that part of the spoke causes failure. This is compounded by heavy loads and on a normal wheel, the lower spoke tension on the non drive side of the rear wheel. (I have no experience with the wheels on a Dahon folder). At your weight, it might be to your benefit to speak to a custom wheel builder to see if a handbuilt wheel set is in your future.
Once your wheel starts to break spokes like this, its only a matter of time till the others break also.
We are an empire. Use it wisely.