Wanted to see how much H2O gets into the rims, so I filled up a tub of fresh H2O. Simulated riding thru it with each wheel for a few minutes, even stopping for an extended period of time in water a few inches deep. Amazing, after drying off the wheels and letting it stand in one spot, the tires have a small puddle where the tire contacts the floor. The water goes in everywhere, the spoke holes, valve holes, sides of the rim, and I'd be inclined to say it goes in where the weld of the rim is if it's not completely welded, from rim side to side. No wonder there are tiny holes drilled to allow for drainage.