I've had two Veloflex sidewalls start to bulge after a while on carbon rims, but also plenty of others that haven't. Still alive to tell the tale.
From the same thread: "I've used them just fine on Zipp and generic Chinese carbon rims without any rim-related problems. Blowing out a poorly constructed gumwall sidewall....that's another issue."
@hippy started
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I've had two Veloflex sidewalls start to bulge after a while on carbon rims, but also plenty of others that haven't. Still alive to tell the tale.