Originally Posted by
microcord
A friend had similar rims, and rim brakes. At the top of one hill, his rims were fine. By the time we reached the bottom of the hill, one rim was warped. Luckily the tyre didn't pop out. We all rolled warily to a station, packed our bikes and went home. Appearance (and wind resistance and weight) be damned: at least for use with rim brakes, I'd rather have bog standard, box-section aluminium rims than carbon fibre rims.
These are tubular rims, not clinchers, so I'm not as concerned about any warping. I do recognize your point though. I definitely keep an eye on them, but I've been riding on these for years now with no issues. I know some of the early carbon clincher rims had issues with heat from heavy braking warping the walls, but don't think the tubular versions really had the same issues.
If I do end up coming upon a good aluminum option I may end up going that route in the future, but for now I'm pretty content with the carbon rims.