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After riding about 800m downhill, I got this:

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BTW, this is TriAce Wheelset for Dahon Mu Ex 2014. Do you think this is safe to ride? Can I repair this?

Sung Kim
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To answer your questions

  • No, they are not safe to ride due to risk of the tube blowing out or the tire rolling off the rim.

  • No, I do not think they are repairable (at home). If they were repaired I would not trust them again.

I believe that this item is not fit for the purpose of a bicycle wheel.

It should be returned to the place of purchase on those grounds and a replacement or refund sought.

andy256
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    Assuming the OP was riding on surfaces appropriate for the wheel, I completely agree it should be returned. And I'd want a refund, not a replacement. – Carey Gregory Mar 04 '15 at 02:44
  • It's TriAce wheelsset for my Dahon. I used Shimano carbon break pad installed by the shop. They said it's my fault, since I use the break too much/strong. No refund. No Warrantee. – Sung Kim Mar 04 '15 at 03:32
  • It seems triace is a BSO brand, and dahon is a folding bike maker, but that doesn't look like a folding bike's wheel. Where did you obtain this wheel? – whatsisname Mar 04 '15 at 04:50
  • By any chance did you record this ride with a GPS app of some sort? I find it really hard to believe that you overheated the rims enough to do that with just 100m of descent unless that 100m was all at once and at a ridiculously steep grade. – Carey Gregory Mar 04 '15 at 05:03
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    @SungKim You say No Warrantee. But most countries have laws requiring merchandise to be fit for purpose, and such laws usually include reasonable use conditions. We are not lawyers, and this site is not for legal advice, but I think it would be worth checking out. For example, in Australia the state governments each have a Department of Consumer Affairs (or similar). Complaints to them often have severe consequences for the supplier of dodgy goods, at no cost to the consumer. Even threatening to lodge a complaint often brings an instant change of supplier attitude. Good luck. – andy256 Mar 04 '15 at 06:16
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    @Garey See here: https://www.dropbox.com/s/s6d68x7qm2ns4wl/Screenshot%202015-03-05%2008.45.16.png?dl=0 This happened in the first half of the downhill. – Sung Kim Mar 05 '15 at 00:46
  • @whatsisname in the Hong Kong local bike shop. – Sung Kim Mar 05 '15 at 00:47
  • @SungKim See Hong Kong Consumer Council – andy256 Mar 05 '15 at 03:24
  • I lived in Hong Kong for a few years and the consumer rights are nowhere near the standard found in the UK. I'd imagine a small wheel will generate more heat at the rim when braking. Miniature and folding bikes are very popular in Hong Kong where space for storing of bicycles is at a premium in small Hong Kong flats. There are all sorts of ways to "pimp" up a miniature bike - it would almost make no sense to put carbon wheels on a folding bike and then take it down a mountain descent. But there you go - I think you found the extremes of their usage - hope you get recompense for the wheels. – OraNob Mar 05 '15 at 15:22
  • @OraNob Smaller wheels do not generate more heat - the kinetic energy to be dissipated is the same regardless of wheel size. Due to the terrain it's almost impossible to go anywhere without a descent. – andy256 Mar 05 '15 at 20:54
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    Smaller wheels have less swept area to dissipate heat. But, that notwithstanding, tell them you want a refund then go to a reputable shop and get an alloy wheel. – Chris Cleeland Mar 05 '15 at 21:18
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    Apologies if I was wrong thinking - small wheels more heat build-up. It was basically thinking along the lines of for a given speed the smaller wheel must be rotating faster than a larger wheel - that's all. – OraNob Mar 05 '15 at 23:34
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    @OraNob No need to apologize. As Chris says, smaller wheels have less area to dissipate the same heat energy. – andy256 Mar 06 '15 at 00:47