Advertise on Bikeforums.net



User Tag List

Page 1 of 2 12 LastLast
Results 1 to 25 of 26
  1. #1
    Senior Member
    Join Date
    Apr 2010
    Location
    SoCal
    My Bikes
    Roubaix SL4 Expert
    Posts
    2,230
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    A New Reason To Shave Your Legs - It's Faster?


  2. #2
    Senior Member
    Join Date
    Jun 2014
    Posts
    186
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'll just be slower.

  3. #3
    Elite Rider Hermes's Avatar
    Join Date
    Oct 2006
    Location
    San Francisco Bay Area
    My Bikes
    Too Many
    Posts
    8,284
    Mentioned
    25 Post(s)
    Tagged
    0 Thread(s)
    From the Specialized web site, their new Evade road helmet saves 46 seconds over 40Km versus a standard road helmet. Leg shaving is more.
    Last edited by Hermes; 07-02-14 at 01:16 PM.
    "Insanity: doing the same thing over and over again and expecting different results." Einstein

  4. #4
    Senior Member
    Join Date
    Apr 2010
    Location
    SoCal
    My Bikes
    Roubaix SL4 Expert
    Posts
    2,230
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Hermes View Post
    According to Specialized, their new Evade road helmet saves 46 seconds over 40Km versus a standard road helmet. Leg shaving is more.
    In the video they say it's like the difference between a Tarmac and Venge.

  5. #5
    Senior Member lsberrios1's Avatar
    Join Date
    Jul 2012
    Location
    Atlanta GA
    My Bikes
    '13 Spech Roubaix SL4 Expert
    Posts
    2,001
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Hermes View Post
    According to Specialized, their new Evade road helmet saves 46 seconds over 40Km versus a standard road helmet. Leg shaving is more.
    So to save even more seconds during 40km I'll strap two Evade helmets to the knees of my gorgeous shaved legs... To the TUB!!!
    Cat 6 going on PRO....

  6. #6
    **** that mattm's Avatar
    Join Date
    Dec 2006
    Location
    CALI
    Posts
    11,183
    Mentioned
    47 Post(s)
    Tagged
    0 Thread(s)
    40km TTs are for freds anyway, seems like hairy legs are the way to go! =]
    pro-meter: lol

    blog

  7. #7
    These Guys Eat Oreos Creatre's Avatar
    Join Date
    Jun 2010
    Location
    Atlanta, GA
    My Bikes
    Yes
    Posts
    3,341
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    Mmk.
    Category 2 | | Velogames BikeForums Leagues: 1st - 2012 Veulta, 1st - 2011 Vuelta, 2nd - 2013 Vuelta, 3rd - 2012 Giro, 4th - 2012 TdF

  8. #8
    Senior Member Wesley36's Avatar
    Join Date
    Jul 2009
    Posts
    606
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Can shaving your legs offer any advantage for regular male cyclists? | Trevor Ward | Environment | theguardian.com

    When it comes to the aerodynamic properties of depilation, Burrows recommends a Mohican for your legs.

    "If you've got a little bit of hair on your legs it will turbulate [sic] the air so you get a better flow. Now this in itself creates friction, so you don't want all your leg hairy you just want two thin strips, each about 10mm wide, just before the sides of your legs – though you will look really stupid.

    You need the turbulent boundary layer – provided by these strips of hair - to get the air around the corner, and you need a smooth layer for it to flow over. But the leg is such a rubbish shape that ideally you want an aerofoil on the back of it."

  9. #9
    Senior Member furiousferret's Avatar
    Join Date
    Jan 2006
    Location
    Redlands, CA
    Posts
    2,544
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    I want to know what Fred's gain is.

  10. #10
    Senior Member
    Join Date
    Aug 2007
    Posts
    1,797
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Hermes View Post
    From the Specialized web site, their new Evade road helmet saves 46 seconds over 40Km versus a standard road helmet. Leg shaving is more.
    do you have a link to that?

    the reason i ask is that prior materials stated the evade has a 1-3W advantage over the prevail @ 30mph, which is about 4-12s over 40k. when it was launched they considered the prevail to take aerodynamics into account, so perhaps they are using something else as the "standard road helmet."

  11. #11
    Elite Rider Hermes's Avatar
    Join Date
    Oct 2006
    Location
    San Francisco Bay Area
    My Bikes
    Too Many
    Posts
    8,284
    Mentioned
    25 Post(s)
    Tagged
    0 Thread(s)
    "Insanity: doing the same thing over and over again and expecting different results." Einstein

  12. #12
    pan y agua merlinextraligh's Avatar
    Join Date
    Aug 2005
    Location
    Jacksonville
    My Bikes
    Wilier Zero 7; Merlin Extralight; Co-Motion Robusta; Schwinn Paramount; Motobecane Phantom Cross; Cervelo P2; Motebecane Ti Fly 29er
    Posts
    27,236
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)
    damn, so much for the hair working like dimples to manage laminar airflow.
    You could fall off a cliff and die.
    You could get lost and die.
    You could hit a tree and die.
    OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.

  13. #13
    Senior Member
    Join Date
    Apr 2010
    Location
    SoCal
    My Bikes
    Roubaix SL4 Expert
    Posts
    2,230
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by tetonrider View Post
    do you have a link to that?
    Here is some more data on the Evade. Not that I think 50km/h drag data is terribly relevant on a road bike...


  14. #14
    Senior Member
    Join Date
    Aug 2007
    Posts
    1,797
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Dunbar View Post
    Here is some more data on the Evade. Not that I think 50km/h drag data is terribly relevant on a road bike...

    yeah. that's inline with what i wrote above (1-3W savings...most of the time yaw <=15). hermes wrote he saw 46s over 40k, which is a 16w redux. was wondering where that was taken from.

  15. #15
    Senior Member
    Join Date
    Apr 2010
    Location
    SoCal
    My Bikes
    Roubaix SL4 Expert
    Posts
    2,230
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by tetonrider View Post
    yeah. that's inline with what i wrote above (1-3W savings...most of the time yaw <=15).
    Where are you getting 1-3 watts? The last graph shows the power savings of the Evade vs. Prevail to be ~14-19w at 50km/h / 31mph. The Evade actually performs best at 0 degrees of yaw.

  16. #16
    \_(ツ)_/ Ygduf's Avatar
    Join Date
    Jun 2008
    Location
    Redwood City, CA
    My Bikes
    road bikes
    Posts
    5,778
    Mentioned
    16 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Dunbar View Post
    Where are you getting 1-3 watts? The last graph shows the power savings of the Evade vs. Prevail to be ~14-19w at 50km/h / 31mph. The Evade actually performs best at 0 degrees of yaw.
    qft

    twitter.com/ygduf
    strava.com/athletes/ygduf

  17. #17
    Elite Rider Hermes's Avatar
    Join Date
    Oct 2006
    Location
    San Francisco Bay Area
    My Bikes
    Too Many
    Posts
    8,284
    Mentioned
    25 Post(s)
    Tagged
    0 Thread(s)
    I have heard that chin hair has the most drag.
    "Insanity: doing the same thing over and over again and expecting different results." Einstein

  18. #18
    Senior Member
    Join Date
    Aug 2007
    Posts
    1,797
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by tetonrider View Post
    yeah. that's inline with what i wrote above (1-3W savings...most of the time yaw <=15). hermes wrote he saw 46s over 40k, which is a 16w redux. was wondering where that was taken from.
    My fault, misread the chart when responding quickly. Traveling at the moment but should be able to dig up some info later. Previously they compared their top tt helmet to the prevail and later there was data on the tt helmet vs the evade. The differences in those comparisons was more like 5-10w for a tt helmet vs prevail, and the evade is close but less than that.

    My calcs from April showed a 1-3 w difference when you scale it down a bit. Will have to check if I scaled it to 20 or 25...or lower. I did a comparison for a short hill climb tt.

    Ok...enough mobile replies. Will report back to either reiterate or correct the calcs.

    My data in the past has agreed with other helmet comparisons that Chris (spcialized) has done...incl prevail v evade v selector v bambino v mclaren tt and tt3.

  19. #19
    Senior Member shovelhd's Avatar
    Join Date
    Jun 2010
    Location
    Western MA
    My Bikes
    Yes
    Posts
    11,669
    Mentioned
    32 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Hermes View Post
    I have heard that chin hair has the most drag.
    I am happy to have any hair.

  20. #20
    \_(ツ)_/ Ygduf's Avatar
    Join Date
    Jun 2008
    Location
    Redwood City, CA
    My Bikes
    road bikes
    Posts
    5,778
    Mentioned
    16 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Hermes View Post
    I have heard that chin hair has the most drag.
    Worth it!

    twitter.com/ygduf
    strava.com/athletes/ygduf

  21. #21
    Senior Member
    Join Date
    Apr 2010
    Location
    SoCal
    My Bikes
    Roubaix SL4 Expert
    Posts
    2,230
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by tetonrider View Post
    Previously they compared their top tt helmet to the prevail and later there was data on the tt helmet vs the evade. The differences in those comparisons was more like 5-10w for a tt helmet vs prevail, and the evade is close but less than that.
    I think you mean this test where they compare the Prevail to the TT2. The savings was 7.5w-9.5w at 25mph. You wouldn't think the Evade was as aero as the TT2. The LG Course goes from about 4w savings at 25mph to a peak of 8-10w at 31-32mph according to the manufacturer data. I have a hard time believing the Evade saves you double that.

  22. #22
    Senior Member
    Join Date
    Aug 2007
    Posts
    1,797
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Dunbar View Post
    I think you mean this test where they compare the Prevail to the TT2. The savings was 7.5w-9.5w at 25mph. You wouldn't think the Evade was as aero as the TT2. The LG Course goes from about 4w savings at 25mph to a peak of 8-10w at 31-32mph according to the manufacturer data. I have a hard time believing the Evade saves you double that.
    thanks for posting that. again, sorry for misreading the chart earlier -- not sure why i was looking at the gap between the bar & the 20W line. i have no excuse for that.

    i don't recall that article you linked to but remember the white paper. it did have that weird data point in it. thanks for posting it. i think what it highlights is that the angle of the helmet is extremely influential on the test results; presumably the angle of the helmet or position relative to the back changes the aerodynamics greatly.

    the 7w difference b/w prevail and tt2 made sense.

    the evade is a pretty damn aero helmet...in some positions more than others. still doesn't quite add up to me. the mclaren TT helmet literature showed a 2-3W difference between it and the TT3 (TT3 was never approved for use in the US)--when the tail is down. the evade was within 5w of the mclaren on a specialized sponsored athlete. (that's really awesome.)

    but to get to ~20W....still scratching my head a bit on that one. maybe, under the perfect set of circumstances. a really perfect TT helmet could be​ 25w over a really bad road helmet over 40k....so maybe.

    on some riders (e.g. tony martin) the tt3 tests the same as the mclaren. you see that he has sometimes worn the tt3 instead of the newer helmet. i am told he likes the feeling of the point on his back. i've found with the short-tailed helmets there's no feedback and it can be easier to lose perfect helmet/neck positioning.

  23. #23
    \_(ツ)_/ Ygduf's Avatar
    Join Date
    Jun 2008
    Location
    Redwood City, CA
    My Bikes
    road bikes
    Posts
    5,778
    Mentioned
    16 Post(s)
    Tagged
    0 Thread(s)
    I just realized april fools falls on 4/1

    twitter.com/ygduf
    strava.com/athletes/ygduf

  24. #24
    Elite Rider Hermes's Avatar
    Join Date
    Oct 2006
    Location
    San Francisco Bay Area
    My Bikes
    Too Many
    Posts
    8,284
    Mentioned
    25 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Ygduf View Post
    Worth it!

    I am relieved.

    "Insanity: doing the same thing over and over again and expecting different results." Einstein

  25. #25
    Senior Member
    Join Date
    Aug 2007
    Posts
    1,797
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)
    well....u23 nationals just happened and a good buddy who rides for cal giant (specialized) posted some pics. the riders TTed in their evades. the mclaren's not legal at that event, and spesh considers it more aero than the tt2 (tt3 was not available outside of europe).

    obv there are sponsor considerations, but they do think enough of the evade at big events, esp for high speed/low yaw.

Page 1 of 2 12 LastLast

Posting Permissions

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