Advertise on Bikeforums.net



User Tag List

Results 1 to 10 of 10

Thread: Wheel Question?

  1. #1
    OnTheRoad or AtTheBeach stonecrd's Avatar
    Join Date
    Aug 2005
    Location
    Weston, FL
    My Bikes
    Ridley Noah RS, Scott CR1 Pro
    Posts
    2,167
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Wheel Question?

    So looking at wheels the options are for lighter standard wheel (ex. Ksyrium Elite =1535g/set) or more aero wheels that are heavier (ex. Cosmic Elite = 1900g/set). I have read that there is a speed crossover point where the aerodynamic advantage overcomes the weight difference. Anyone have a feel for what that speed is, I have heard around 20mph. I like the look of aero wheels, more aggressive looking in my opinion but I don't want to do more work just because it looks better to me.
    The problem with the gene pool is that there is no lifeguard and the shallow end is much too large

    2013 Noah RS

  2. #2
    Elite Rider Hermes's Avatar
    Join Date
    Oct 2006
    Location
    San Francisco Bay Area
    My Bikes
    Too Many
    Posts
    8,258
    Mentioned
    20 Post(s)
    Tagged
    0 Thread(s)
    Here is the tale of the tape...

    (testing on a velodrome)

    http://www.xentis.net/pics/Laufradte...zember2005.pdf

    Watt savings over a 32 round-spoked Ambrosio Nemesis at 45kmh/28mph
    Vuelta carbon pro -38 Watt
    Xentis mark 1 -37 Watt
    Zipp 808 -36 Watt
    Bontrager Aeolus -34 Watt
    Zipp 999 -29 Watt
    Ritchey carbon -28 Watt
    Easton Tempest II carbon -29 Watt
    Lightweight TT -27 Watt
    Mavic Cosmic Carbone -22 Watt
    Corima 3 spoke+Disc -20 Watt
    Corima 3 spoke -20 Watt
    Lightweight 12/20 -19 Watt
    Corima Aero -19 Watt
    Tune Olympic Gold -16 Watt
    Nimble Crosswind -5 Watt

    I am a member of the bike tech review forum which focuses on TT racing, wind tunnels and fast wheels. The Nimble on wheels created quite a stir that is still buzzing. In effect, Nimble feels deep dish wheels only offer advantages head on and degrade performance in cross winds. In triathelons and TTs, there is usually cross winds. There is a LOT of technical stuff in this thread. Probably more confusing than clarifying.

    I went through the Zipps v Reynolds V Bontrager V Cosmic and test rode some deep dish wheels on the road in the cross winds. They are not as stable and you should check it out. They may be faster or slower but when the gusts come, you take a hit to the side. I bought the Bontrager Race XXX lite carbon clinchers 1350 gms and figured that I need more juice on the hills for my training / club rides and it is better handling in the cross winds. Next season, i am going to Time Trial as an individual and will buy a TT bike with a disc rear wheel and maybe Nimble front. Good luck.

    http://biketechreview.com/phpBB2/vie...t=cosmic+wheel
    Last edited by Hermes; 06-13-07 at 12:59 PM.
    "Insanity: doing the same thing over and over again and expecting different results." Einstein

  3. #3
    Elite Rider Hermes's Avatar
    Join Date
    Oct 2006
    Location
    San Francisco Bay Area
    My Bikes
    Too Many
    Posts
    8,258
    Mentioned
    20 Post(s)
    Tagged
    0 Thread(s)
    I did not answer you question about cross over point. Somewhere in Bike tech review, that question is answered. However, another way to get to the answer is to look at the pro peloton. Most of the pros are racing deep dish wheels even in the mountain stages. Also, they are all carbon and weigh less than Cosmics. My gut says if you ride primarily flat terrain with some climbing and light winds, go with the Cosmics. If you have a lot of cross wind, then test some deep dish wheels out and see how you like them.
    "Insanity: doing the same thing over and over again and expecting different results." Einstein

  4. #4
    Elite Rider Hermes's Avatar
    Join Date
    Oct 2006
    Location
    San Francisco Bay Area
    My Bikes
    Too Many
    Posts
    8,258
    Mentioned
    20 Post(s)
    Tagged
    0 Thread(s)
    Final point...they do look great on the road. You will definitely scare the Freds but offer them the opportunity to post when they drop the guy with the fast wheels.
    "Insanity: doing the same thing over and over again and expecting different results." Einstein

  5. #5
    OnTheRoad or AtTheBeach stonecrd's Avatar
    Join Date
    Aug 2005
    Location
    Weston, FL
    My Bikes
    Ridley Noah RS, Scott CR1 Pro
    Posts
    2,167
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    In this months Road Bike Action Rick Hjertberg from Wheelsmith comments that if you are riding below a 20mph avg aero is a non issue. So I am probably right on the edge of getting any real benefit from the aero wheels. Probably better off looking at the weight.
    The problem with the gene pool is that there is no lifeguard and the shallow end is much too large

    2013 Noah RS

  6. #6
    Elite Rider Hermes's Avatar
    Join Date
    Oct 2006
    Location
    San Francisco Bay Area
    My Bikes
    Too Many
    Posts
    8,258
    Mentioned
    20 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by stonecrd
    In this months Road Bike Action Rick Hjertberg from Wheelsmith comments that if you are riding below a 20mph avg aero is a non issue. So I am probably right on the edge of getting any real benefit from the aero wheels. Probably better off looking at the weight.
    If you get Versus, check out Cyclism Sundays. The Daufine race is this week. Check out the wheels. In the Giro d'Italia, they rode aero wheels in the steepest parts and were putting 29 tooth gears on their cassettes shocking. They were really going slow. It will be interesting to see what they ride in the Alpes this year in the Tour de France especially Alpe d'Huez.
    "Insanity: doing the same thing over and over again and expecting different results." Einstein

  7. #7
    Senior Member
    Join Date
    Nov 2006
    Location
    Charlotte, North Carolina, USA
    My Bikes
    '71 Raleigh Sports, '84 Schwinn LeTour on the trainer (and available for hill repeats), '06 Scott CR1 SL (Ksyrium SL), and a yet-to-be-determined TT bike.
    Posts
    1,643
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Stonecrd, I just happened to be reading this old archived thread from Road Cycling a few days ago, as I was considering some new wheels for my time trials. Lots of good info above. Here is another discussion of the topic: Wheels: Aerodynamic vs lightweight

    Edit: This is actually the thread to which I meant to link, but I'm leaving the other in place: Aero wheels vs. regular wheels for non-race riding?
    Last edited by VegaVixen; 06-14-07 at 08:28 AM.

  8. #8
    Senior Member jazzy_cyclist's Avatar
    Join Date
    Sep 2004
    Location
    North Central Massachusetts
    My Bikes
    Cannondale R600
    Posts
    1,281
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    As a practical consideration, those [deep] rims can catch a lot of wind when its blowing across the road, and that can get a little scary if its gusting pretty good. Then again, ya gotta look good...

  9. #9
    OnTheRoad or AtTheBeach stonecrd's Avatar
    Join Date
    Aug 2005
    Location
    Weston, FL
    My Bikes
    Ridley Noah RS, Scott CR1 Pro
    Posts
    2,167
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    VV thanks, Good info. I am basically looking at the Cosmic Elites which are not all that deep such as the Zipps or Carbones. Those are way too expensive for me since I don't race and with all of the wind I have to deal would probably cause me some grief as jazzy mentions. I see a lot of bikes riding around here and for whatever reason the wheels seem to attract my attention more than the frame.
    The problem with the gene pool is that there is no lifeguard and the shallow end is much too large

    2013 Noah RS

  10. #10
    Senior Member
    Join Date
    May 2005
    Posts
    6,901
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by jazzy_cyclist
    As a practical consideration, those [deep] rims can catch a lot of wind when its blowing across the road, and that can get a little scary if its gusting pretty good. Then again, ya gotta look good...
    True statement. What is your intended purpose for the wheels? Even something like a FSA 600 can catch a lot of cross wind and make your day more work than it is worth.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •