Dahon have had a problem with their special 20" rims for as long as I can remember where the tubes looked like they were punctured but they weren't! As the tire tube expands, the tube will catch on part of the spoke nut and rip open the hole. The rim comes with a clear elastic rim tape which is better than the rubber tapes but still not good enough on its own. My decision! Velox fabric rim tape 10 mm. Ideal for Dohon discs. You wrap it over the open nuts to even it out. I wrapped it in a whole roll so when I come back the second time I use a hole punch to make the second hole. I then take a clear elastic and place it over it to give it a smooth finish that fabric ties can't offer. Finally, I coat every inch of the tire chamber, the inside of the rim, and the tire with baby powder. I even put a lot of powder where the valve stem goes. Get some air in the tube, pour in some more powder, massage to get rid of the turbulence on the tube and plant the ball. I've ridden it twice, 2 hours each time, and it's still good . See the following link for pictures of the rim tape installation: RIM TAPE VELOX 10mm NARROW #56 As for the camera, I have no problem with the cameras themselves. Not a single tube I've ever bought has been defective, but I've bought many because I carried on like an idiot and always put in a new tube whenever something happened.
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