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  1. #3351
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    (Cheap) Chinese Carbon Rims?

    Quote Originally Posted by pimpbot View Post
    So.... Customer beta testing. Greeeeaaat. I guess that's why the are cheap. I dunno, I would volunteer for that.
    Volunteer=pay $360 like everyone else
    Nobody's stopping you. Post up the test results.
    Quote Originally Posted by pvd
    Time to stop believing the hype and start doing some science.
    29er Tire Weight Database

  2. #3352
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    Quote Originally Posted by lokisare View Post
    have you weighed them? Interested to know if there's any weight difference.
    They came in at 380 and 386g

  3. #3353
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    Quote Originally Posted by spsoon View Post
    They came in at 380 and 386g
    Sweet so at the lower end of the weight range, keep us posted on your build and how it goes!

  4. #3354
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    Quote Originally Posted by ViltusVilks View Post
    Ordered road 38mm clinchers with DB hubs for my 29er. Seller said many used them in CX and no problems. Pic/review/weight will come soon
    Waiting for!!

  5. #3355
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    It would be interesting to see how many people are running carbon rims with inner tubes.....personally I think by running them tubeless, it increases the safety factor because you will know very quickly when the rim is starting to fail. I saw someone post that they installed a tube after their carbon hoops failed and could not tell they were broken. Running tubes is dangerous because when it does fail, it will be catastrophic.

  6. #3356
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    Quote Originally Posted by YaMon View Post
    It would be interesting to see how many people are running carbon rims with inner tubes.....personally I think by running them tubeless, it increases the safety factor because you will know very quickly when the rim is starting to fail. I saw someone post that they installed a tube after their carbon hoops failed and could not tell they were broken. Running tubes is dangerous because when it does fail, it will be catastrophic.
    Realistically though, you're a hundred times more likely to crash from a front tire tubeless burp than from a shattered rim that somehow fails worse with a tubular setup. I can't even remember all of the burp induced crashes, ending in injury, that I've personally witnessed. One guy even went off the side of a 30 foot cliff. Despite running tubeless on these rims myself, I consider it to be more dangerous, not safer.

  7. #3357
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    Just trying to alleviate the "fear" people are posting about carbon rims. You don't hear about burp related crashes......

  8. #3358
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    I have heard many accounts of burp crashes, but almost never heard of a "crash" related to a catastrophic carbon rim failure.
    Full rigid SS, Hardtail SS, Hardtail Geared, Full Suspension Geared.

  9. #3359
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    For the sake of levity, I've never burped a Tubeless Ready tire while using a Bontrager rim strip.

  10. #3360
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    Just responding to what I believe is the "fear" about going with these light-bicycle rims.... That would certainly solve it, but open up another can of worms......

  11. #3361
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    Quote Originally Posted by YaMon View Post
    It would be interesting to see how many people are running carbon rims with inner tubes.....personally I think by running them tubeless, it increases the safety factor because you will know very quickly when the rim is starting to fail. I saw someone post that they installed a tube after their carbon hoops failed and could not tell they were broken. Running tubes is dangerous because when it does fail, it will be catastrophic.
    I am. I ran mine with Lunar Lite tubes for a while. I was having issues with getting my tubeless to seal up, and I wanted to ride. Meh... tubeless doesn't save any weight over a Lunar Lite anyway. I guess is saves a tiny amount of drag. I don't really get flats very often, so PITA factor is much bigger than the benefit for me.

    I can't imagine at the pressures mountain bikes run that safety is much of an issue, or that it even makes a difference. Pressure is pressure, no mater if it is contained in a balloon or gooey sealant by the edges. It's not as if the tube is adding any actual structure.

    BTW, I run 25-27 psi with tubes.

    As far as safety goes, I've had my front tire suddenly burp out most of it's air right when I need it to stick the most, nearly sending me OTB on several different occasions. IMO, tubes are way safer. Whenever I ride my bike with the tubeless setup, I constantly have in the back of my mind the idea that it's gonna burp on me in the middle of a techy rocky section and dump me on my ass. I trust my carbon rims of mysterious construction and quality control way more than I trust tubeless.

    Tubes just work. Hard to argue with that.

    Oh, but one rub: Performance Bike discontinued Lunar Lite tubes for mountain bikes. Currently, their lightest is the .65mm thick 'Ultralite' one, not the 0.45mm LunarLite.
    Last edited by pimpbot; 03-04-2013 at 04:40 PM.

  12. #3362
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    (Cheap) Chinese Carbon Rims?

    The only time I ever burped a tire was tubeless 1.0 with Mavic 717/Stan's/Pythons.

    I have run Bontrager's system ever since starting with Race Modified's, then RXLs and finally the Light Bicycle with the Rhythm strip.

    I haven't worried about burping a tire in over eight years.

    I run 20psi front and 22psi rear with maxxis ikon, 165lbs.

  13. #3363
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    Well I cannot imagine that the burping is occurring as often as same people may be indicating. I am assuming they are running way too low pressures. If the burping was such a major problem, they would not be selling as many and it would not be so popular. I run my rims tubed with 30 pounds, I feel very safe running tubeless at 25-30 pounds.

    Back to the carbon rims, if you run them as a tubeless setup you should get advanced warning that the rim is damaged. It is unusual for carbon fiber to literally separate in two pieces. It usually starts with a crack .......

  14. #3364
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    I have raced on mine at 19-20 psi (190lbs) in the snow and had no burping issues.

  15. #3365
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    Quote Originally Posted by YaMon View Post
    If the burping was such a major problem, they would not be selling as many and it would not be so popular.
    bulletproof logic
    what level of popularity would allow for "major problem" burping and what level of popularity are they at now?
    Quote Originally Posted by YaMon View Post
    Back to the carbon rims, if you run them as a tubeless setup you should get advanced warning that the rim is damaged. It is unusual for carbon fiber to literally separate in two pieces. It usually starts with a crack .......
    What if the rim cracks underneath a layer of tape? or under a rim strip? or underneath tape and a rim strip? or around a spoke hole?
    Quote Originally Posted by pvd
    Time to stop believing the hype and start doing some science.
    29er Tire Weight Database

  16. #3366
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    Quote Originally Posted by broadwayline View Post
    I have raced on mine at 19-20 psi (190lbs) in the snow and had no burping issues.
    Same results here........I have been running tubeless for years and it realy comes down to the tires. I run Special Ed 2Bliss on these rims and Stan's rims....work great!

  17. #3367
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    Well, I discovered something rather unfortunate this morning, a crack in my rear rim. I was actually about to come on here and give an update saying everything thus far has been great about the wheels, no problems whatsoever. I guess I can't say that anymore... I was just checking over my bike in my bike stand this morning when I discovered it. Who knows when it happened, could have been last ride could have been weeks ago. I have no clue. As far as I can recall I never bottomed out the rim but in their defense I do ride very aggressively, more so than my bike is really designed for. I've only had the wheels about two months but I can't imagine they would warranty this, it's pretty clearly done by myself. Now I just need to decide if I want to replace the rim with another carbon one or if I should just go back to aluminum...
    Pictures:





    Will do a closer inspection of the rest of the rim and the front rim when I get off of work. In fact I need to leave for work... 2 minutes ago.

  18. #3368
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    They work with I9's...why dont you think they will work with yours?
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    Quote Originally Posted by Boudre0aux View Post
    I wish they would work with my I9 hubs.

  19. #3369
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    Make sure u don't bottom out! I mean if i read things about carbon frames cracking when they knock against rocks etc...

  20. #3370
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    Quote Originally Posted by erikrc10 View Post
    Well, I discovered something rather unfortunate this morning, a crack in my rear rim. I was actually about to come on here and give an update saying everything thus far has been great about the wheels, no problems whatsoever. I guess I can't say that anymore... I was just checking over my bike in my bike stand this morning when I discovered it. Who knows when it happened, could have been last ride could have been weeks ago. I have no clue. As far as I can recall I never bottomed out the rim but in their defense I do ride very aggressively, more so than my bike is really designed for. I've only had the wheels about two months but I can't imagine they would warranty this, it's pretty clearly done by myself. Now I just need to decide if I want to replace the rim with another carbon one or if I should just go back to aluminum...
    Pictures:





    Will do a closer inspection of the rest of the rim and the front rim when I get off of work. In fact I need to leave for work... 2 minutes ago.
    What have you got to lose??????call them.

  21. #3371
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    Quote Originally Posted by meltingfeather View Post
    bulletproof logic
    what level of popularity would allow for "major problem" burping and what level of popularity are they at now?

    Well judging by how many brands of rims tape and valves and liquid out there, not to mention the investment of tires, it would seem to me that there is more than a significant amount being sold. Tire companies would not invest in special molds unless they can recoup the cost. Your guess as to the total sales is as good as mine. But common sense tells you it is very significant.

    What if the rim cracks underneath a layer of tape? or under a rim strip? or underneath tape and a rim strip? or around a spoke hole?
    You will never be able to satisfy every situation. So you look at the percentages. Even if it cracks at the spoke hole or valve, if it migrates, it will still give you more of an advance warning then if you do not have it. .....those road aero rims would give you more than ample warning. Take a look at the post below with the cracked rim, I think that would be a normal break.......

  22. #3372
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    Quote Originally Posted by erikrc10 View Post
    Well, I discovered something rather unfortunate this morning, a crack in my rear rim. I was actually about to come on here and give an update saying everything thus far has been great about the wheels, no problems whatsoever. I guess I can't say that anymore... I was just checking over my bike in my bike stand this morning when I discovered it. Who knows when it happened, could have been last ride could have been weeks ago. I have no clue. As far as I can recall I never bottomed out the rim but in their defense I do ride very aggressively, more so than my bike is really designed for. I've only had the wheels about two months but I can't imagine they would warranty this, it's pretty clearly done by myself. Now I just need to decide if I want to replace the rim with another carbon one or if I should just go back to aluminum...
    Pictures:





    Will do a closer inspection of the rest of the rim and the front rim when I get off of work. In fact I need to leave for work... 2 minutes ago.

    We're you running tubes? Or Kidd you setup tubeless?.

  23. #3373
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    If you remove the img tags those photos will not appear in every freakin post.

  24. #3374
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    (Cheap) Chinese Carbon Rims?

    Quote Originally Posted by YaMon View Post
    We're you running tubes? Or Kidd you setup tubeless?.
    Tubeless (see his post in this thread about Bonty rim strips & Nevegals).
    Sometimes theories don't play out.
    Quote Originally Posted by pvd
    Time to stop believing the hype and start doing some science.
    29er Tire Weight Database

  25. #3375
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    (Cheap) Chinese Carbon Rims?

    Quote Originally Posted by YaMon View Post
    You will never be able to satisfy every situation. So you look at the percentages. Even if it cracks at the spoke hole or valve, if it migrates, it will still give you more of an advance warning then if you do not have it. .....those road aero rims would give you more than ample warning. Take a look at the post below with the cracked rim, I think that would be a normal break.......
    What percentages? From here it looks like more often than not tubeless does not give any indication of a cracked rim.
    Why wouldn't the sealant seal a crack?
    Not a bad thought, even if presented as fact/reality, it just doesn't play out based on the available evidence.
    Quote Originally Posted by pvd
    Time to stop believing the hype and start doing some science.
    29er Tire Weight Database

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