Carbon rims a waste of money ?

avababy24
avababy24 Posts: 162
edited April 2014 in Road general
As per title really.......

Any opinions ?
«1

Comments

  • DiscoBoy
    DiscoBoy Posts: 905
    Lots. Do a search.
    Red bikes are the fastest.
  • Anonymous
    Anonymous Posts: 79,667
    People on here say carbon frames are a waste of money so good luck asking about carbon rims.

    Carbon spokes would be really silly....................oops :oops:

    Can you even waste money on a bike?
    Is a nice watch a waste of money? An expensive Holiday?

    Smoking seems to be far more than just a waste of money but smokers seem to get away with blowing thousands and still be socially acceptable :shock:
  • diplodicus
    diplodicus Posts: 722
    I used to smoke but have never owned carbon rims. Have I wasted money? :evil:
  • sloppyschleckonds
    sloppyschleckonds Posts: 8,019
    Top trolling, 3/10
    I'm sorry you don't believe in miracles
  • avababy24
    avababy24 Posts: 162
    SloppySchleckonds wrote:
    Top trolling, 3/10
    What are you on about ? I'm about to pull the trigger on some carbon clinchers using Dura ace hubs and just wanted people's opinions ?

    Trolling my ....
  • imposter2.0
    imposter2.0 Posts: 12,028
    avababy24 wrote:
    SloppySchleckonds wrote:
    Top trolling, 3/10
    What are you on about ? I'm about to pull the trigger on some carbon clinchers using Dura ace hubs and just wanted people's opinions ?

    Trolling my ....

    Maybe ask a more pertinent question next time, then...
  • avababy24
    avababy24 Posts: 162
    Imposter wrote:
    avababy24 wrote:
    SloppySchleckonds wrote:
    Top trolling, 3/10
    What are you on about ? I'm about to pull the trigger on some carbon clinchers using Dura ace hubs and just wanted people's opinions ?

    Trolling my ....

    Maybe ask a more pertinent question next time, then...


    Well my son, now let's get on with gods work this day and talk about the virtue's of Carbon within rims
  • MattC59
    MattC59 Posts: 5,408
    avababy24 wrote:
    Imposter wrote:
    avababy24 wrote:
    SloppySchleckonds wrote:
    Top trolling, 3/10
    What are you on about ? I'm about to pull the trigger on some carbon clinchers using Dura ace hubs and just wanted people's opinions ?

    Trolling my ....

    Maybe ask a more pertinent question next time, then...


    Well my son, now let's get on with gods work this day and talk about the virtue's of Carbon within rims

    God doesn't exist.
    Science adjusts it’s beliefs based on what’s observed.
    Faith is the denial of observation so that Belief can be preserved
  • Monty Dog
    Monty Dog Posts: 20,614
    Depends on whether you're buying them because you want to ride fast, or simply like 9/10 of riders, you're a bike tart and you want them because they 'look' fast - the fact that you're after clinchers suggests the latter ;-)
    Make mine an Italian, with Campagnolo on the side..
  • imposter2.0
    imposter2.0 Posts: 12,028
    avababy24 wrote:
    Imposter wrote:
    avababy24 wrote:
    SloppySchleckonds wrote:
    Top trolling, 3/10
    What are you on about ? I'm about to pull the trigger on some carbon clinchers using Dura ace hubs and just wanted people's opinions ?

    Trolling my ....

    Maybe ask a more pertinent question next time, then...


    Well my son, now let's get on with gods work this day and talk about the virtue's of Carbon within rims

    It's been done before, many times. Talking about the virtues of unnecessary apostrophes would be more useful, to be honest.
  • avababy24
    avababy24 Posts: 162
    Imposter wrote:
    avababy24 wrote:
    Imposter wrote:
    avababy24 wrote:
    SloppySchleckonds wrote:
    Top trolling, 3/10
    What are you on about ? I'm about to pull the trigger on some carbon clinchers using Dura ace hubs and just wanted people's opinions ?

    Trolling my ....

    Maybe ask a more pertinent question next time, then...


    Well my son, now let's get on with gods work this day and talk about the virtue's of Carbon within rims

    It's been done before, many times. Talking about the virtues of unnecessary apostrophes would be more useful, to be honest.

    Yes, your, correct, Mr Headteacher, now if you don't want too, contribute to this, discussion please don your Rapha kit and ride on into the sunset,,,,,,,,,, regards xx
  • charlie_potatoes
    charlie_potatoes Posts: 1,921
    avababy24 wrote:
    Any opinions ?

    Yep! You're out of your depth :wink:
    "You really think you can burn off sugar with exercise?" downhill paul
  • avababy24
    avababy24 Posts: 162
    Charlie Potatoes wrote:
    avababy24 wrote:
    Any opinions ?

    Yep! You're out of your depth :wink:

    Yes I think your correct Charles. Think I'll leave you lot to ride round on your 'classic steels' and club jerseys....
  • imposter2.0
    imposter2.0 Posts: 12,028
    avababy24 wrote:
    Yes, your, correct, Mr Headteacher, now if you don't want too, contribute to this, discussion please don your Rapha kit and ride on into the sunset,,,,,,,,,, regards xx

    I don't have any Rapha kit..? Or Castelli or Assos for that matter...
  • sloppyschleckonds
    sloppyschleckonds Posts: 8,019
    avababy24 wrote:
    I'm about to pull the trigger on some carbon clinchers using Dura ace hubs


    Brilliant, just brilliant :lol::lol::lol:
    I'm sorry you don't believe in miracles
  • MattC59
    MattC59 Posts: 5,408
    avababy24 wrote:
    Charlie Potatoes wrote:
    avababy24 wrote:
    Any opinions ?

    Yep! You're out of your depth :wink:

    Yes I think your correct Charles. Think I'll leave you lot to ride round on your 'classic steels' and club jerseys....

    Wow, you must have huge shoulders to carry that chip !
    :roll:
    Science adjusts it’s beliefs based on what’s observed.
    Faith is the denial of observation so that Belief can be preserved
  • simon_masterson
    simon_masterson Posts: 2,740
    Given that you can get alloy, carbon, and probably some old stock steel rims if you look around, all within the same price range, why would a rim be a waste of money just because it's made from carbon? Moar criteria pls.
    Retro(ish) TT 2017-
    Fixed TT 2015-2016
  • mattmaximus
    mattmaximus Posts: 132
    No, not a waste of money, they do a job. Whether they're worth the money is a different question; the answer depends on how much money you have, what rims you're talking about and what you plan to do with them.

    I have dura ace c50 wheels and love them. I'm convinced they make me appreciably faster (physics be damned) and they look the business. Since I am not the lightest, however, they don't get a lot of use and, on balance, there's no way I could argue that they're worth their retail value. If I break them I'm screwed, because a replacement rim costs stupid money and the hubs have such a low spoke count that there would be pretty much nothing I could do with them other than sell them, which I imagine would be difficult.

    As said above, you'll get better advice if you give more detail about yourself.
  • de_sisti
    de_sisti Posts: 1,283
    avababy24 wrote:
    Charlie Potatoes wrote:
    avababy24 wrote:
    Any opinions ?

    Yep! You're out of your depth :wink:

    Yes I think you're correct Charles. Think I'll leave you lot to ride round on your 'classic steels' and club jerseys....
    FTFY :wink:
  • neeb
    neeb Posts: 4,473
    The straightforward answer is that carbon lets you build lightweight, deeper section rims. 40-50mm rims made out of alloy are very heavy. So if you think the type of riding you do means that you will gain a benefit from deeper section rims then carbon rims are not a waste of money.

    Deep section rims are very marginally faster, but you won't notice the difference at all unless you are a strong and competitive rider.
  • Savagestorm
    Savagestorm Posts: 79
    Here is some actual science:
    http://www.biketechreview.com/index.php ... erformance

    This tool can be used to look at your specific aero scenario:
    http://www.cyclingpowerlab.com/Componen ... amics.aspx
  • Bar Shaker
    Bar Shaker Posts: 2,313
    Savagestorm wrote:
    Here is some actual science:
    http://www.biketechreview.com/index.php ... erformance

    That bloke couldn't hit a barn door with a sawn off shot gun, if he was standing 3 feet away from it.

    Someone ask him why TT and track riders use discs.
    Boardman Elite SLR 9.2S
    Boardman FS Pro
  • imposter2.0
    imposter2.0 Posts: 12,028
    Bar Shaker wrote:
    Savagestorm wrote:
    Here is some actual science:
    http://www.biketechreview.com/index.php ... erformance

    That bloke couldn't hit a barn door with a sawn off shot gun, if he was standing 3 feet away from it.

    Someone ask him why TT and track riders use discs.

    Not sure what point you are trying to make. Aero and inertia effects are already covered in that article..
  • Bar Shaker
    Bar Shaker Posts: 2,313
    Drag increases by the square of the speed.

    Spokes are messy things, aerodynamically, even thin bladed ones.

    The spokes in a wheel are stationary next to the road, travelling at bike speed when level the hub and are travelling forward at twice the bike speed at the top of the wheel. This is where most of the drag of the wheel comes from... the spokes chopping through the air at twice bike speed. Deep section wheels remove spoke material from where they travel fastest (on the outer part of the wheel) and replace them with smooth rim section. Fewer spokes and deep rim sections are much more aerodynamically efficient... on a rolling bike.

    At 10mph, the rider creates a drag of (in simple terms) his body area times 100. At 20mph, it is his body area times 400.

    The drag at the tip of a spoke is times 400 at 10mph and times 1600 at 20mph.

    Discs have no exposed spokes at all. What does that mean for their drag?

    That guys misses the point completely.

    Apologies if that is too simple for those that grasp the concept.
    Boardman Elite SLR 9.2S
    Boardman FS Pro
  • imposter2.0
    imposter2.0 Posts: 12,028
    Bar Shaker wrote:

    The drag at the tip of a spoke is times 400 at 10mph and times 1600 at 20mph.

    I don't doubt that - but what percentage of the overall drag is created by this effect? I suspect the answer is 'not very much'...
  • avababy24
    avababy24 Posts: 162
    Carbon = hit a pot hole, knackered, other material maybe more robust ?

    Profile, Carbon lends itself to greater profiles greater versatility ? Alloy not so much, what's the greatest profile depth that most wheel builders are comfortable to build with 30-35mm ? In carbon, doesn't seem a problem ?

    Pro's and cons isn't it
  • neeb
    neeb Posts: 4,473
    avababy24 wrote:
    Carbon = hit a pot hole, knackered, other material maybe more robust ?
    This guy rode around the world on some Reynolds 32 carbon rims with no issues (albeit with disk brakes, so no rim wear). Must have met a few pot holes along the way.. :wink:

    arriving-at-Greenwich-e1339869248183.jpg

    Quote from the man himself:
    “The wheels were great. They were a bit out of true when I got to Salt Lake City [Utah, USA] where I went and visited Reynolds. They had a look at the wheels and said that the nipples were corroded, so they replaced them along with the spokes and trued them up. I had hit some big holes along the way.

    “I probably had five or six big pinch punctures and there were two or three where I cleaned the rims up to look for cracks. You’re on a fast road and you hit a square-edged hole at 30mph; that’s a bit worrying. But the rims were always fine.”
  • darkhairedlord
    darkhairedlord Posts: 7,180
    Carbon isn't fragile, poor design is! The problem is the yield strength is very close to the ultimate tensile stress so where an aluminium alloy rim might suffer permanent deformation a carbon rim will fail. It does have a superior strength to weight ratio though, but by the time you add in some allowance for the above there isn't a lot in it. Perfect for stronger rims of the same mass or lighter rims withe same strength but don't expect both.
  • neeb
    neeb Posts: 4,473
    Those Reynolds rims are pretty light though...
  • avababy24
    avababy24 Posts: 162
    So in all honesty your planning to ride round the world who here would in all honesty pick carbon rins ??

    Not one I bet !!

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