Sunt in culpa qui officia desent mollit anim

A bicycle’s performance, in both biological and mechanical terms, is extraordinarily efficient. In terms of the amount of energy a person must expend to travel a given distance, investigators have calculated it to be the most efficient self-powered means of transportation. In terms of the ratio of cargo weight a bicycle can carry to total weight, it is also a most efficient means of cargo transportation.

Mechanical efficiency

From a mechanical viewpoint, up to 99% of the energy delivered by the rider into the pedals is transmitted to the wheels (clean, lubricated new chain at 400W), although the use of gearing mechanisms reduces this by 1-7% (clean, well-lubricated derailleurs), 4-12% (chain with 3-speed hubs), or 10-20% (shaft drive with 3-speed hubs). The higher efficiencies in each range are achieved at higher power levels and in direct drive (hub gears) or with large driven cogs (derailleurs).

Energy efficiency

A human being traveling on a bicycle at 16–24 km/h (10–15 mph), using only the power required to walk, is the most energy-efficient means of human transport generally available. Air drag, which increases with the square of speed, requires increasingly higher power outputs relative to speed, power increasing with the cube of speed as power equals force times velocity. A bicycle in which the rider lies in a supine position is referred to as a recumbent bicycle or, if covered in an aerodynamic fairing to achieve very low air drag, as a streamliner.
On firm, flat ground, a 70 kg (150 lb) person requires about 60 watts to walk at 5 km/h (3.1 mph). That same person on a bicycle, on the same ground, with the same power output, can travel at 15 km/h (9.3 mph) using an ordinary bicycle, so in these conditions the energy expenditure of cycling is one-third of walking.

Typical speeds

In utility cycling there is a large variation; an elderly person on an upright roadster might do less than 10 km/h (6.2 mph) while a fitter or younger person could easily do twice that on the same bicycle. For cyclists in Copenhagen, the average cycling speed is 15.5 km/h (9.6 mph).
On a racing bicycle, a reasonably fit rider can ride at 40 km/h (25 mph) on flat ground for short periods

Reduction of weight and rotating mass

There has been major corporate competition to lower the weight of racing bikes in order to be faster uphill and accelerating. The UCI sets a limit of 6.8 kg on the minimum weight of bicycles to be used in sanctioned races

4,649 comments

  1. Alexandra

    Hey there I am so thrilled I found your blog, I really found you by accident, while I was looking on Askjeeve for something else, Anyways I am here now and would just like to say thank you for a incredible post and
    a all round enjoyable blog (I also love the theme/design), I don’t have time to look over it all at the moment but I have saved it and also added in your RSS feeds, so when I have time
    I will be back to read much more, Please do keep up the great jo.

    My website; салициловый пилинг

  2. Vallie

    Write more, thats all I have to say. Literally, it seems as though you relied on the
    video to make your point. You obviously know what youre talking about, why waste your intelligence on just posting videos
    to your weblog when you could be giving us something enlightening to read?

    my web site … тредлифтинг мезонитями

  3. Mariana

    Hey There. I found your blog using msn. This is an extremely well written article.

    I’ll make sure to bookmark it and come back to read more of youur useful info.
    Thanks for the post. I will certainly return.
    Bodybuilder web site bodybuilder

  4. Forrest

    I believe what you wrote made a lot of sense. But, what
    about this? suppose you added a little information?
    I mean, I don’t want to tell you how to run your
    blog, but what if you added something to maybe get folk’s attention?
    I mean Sunt fun in phoenix culpa qui
    officia desent mollit anim – The International Society
    of Creatine Kinase Research is kinda plain. You should look at Yahoo’s home page and watch how they write news titles to grab people
    to open the links. You might add a video or a pic or two to
    grab people interested about everything’ve got to say.
    Just my opinion, it might bring your blog a little livelier.

  5. baccaratsite

    As I am looking at your writing, baccaratsite I regret being unable to do
    outdoor activities due to Corona 19, and I miss my old daily life. If you also miss the daily life
    of those days, would you please visit my site once? My site is a site where I post about photos
    and daily life when I was free.

  6. Eli

    You can certainly see your expertise within the work you write.

    The world hopes for more passionate writers like you who aren’t afraid to say how they believe.
    At all times follow your heart.

    Stop by my blog post – cash home buyers

  7. Jaclyn

    I am sure this paragraph has touched all the internet
    visitors, its really really good paragraph
    on building up new web site.

    Feel free to visit my blog: fun facts about spiders (euroopera.org)

  8. Foster

    Greetings! I know this is kinda off topic however , I’d figured I’d ask.
    Would you be interested in exchanging links or maybe guest authoring
    a blog article or vice-versa? My website addresses a lot of the same topics as yours and
    I feel we could greatly benefit from each other.
    If you happen fun places to go in atlanta be interested
    feel free to shoot me an e-mail. I look forward to hearing from you!
    Superb blog by the way!

  9. Betty

    Hey! This is kind of off topic but I need some guidance from an established blog.
    Is it difficult to set up your own blog? I’m not very techincal but I
    can figure things out pretty fast. I’m thinking about
    making my own but I’m not sure where to start. Do you have any ideas or suggestions?

    Cheers

    My homepage … rem-dom-stroy.ru

  10. Mauricio

    It is appropriate time to make some plans for the long run and it is time to be happy.

    I’ve read this post and if I may I desire to counsel you some interesting issues or advice.

    Perhaps you could write subsequent articles relating to this article.

    I wish to learn more things approximately it!

    Feel free to visit my blog post :: hay day скачать на компьютер

  11. Elvia

    Hello there, I found your web site by means of Google
    even as searching for a similar topic, your web site came up, it seems good.
    I have bookmarked it in my google bookmarks.
    Hello there, just turned into aware of your weblog via Google, and located that it’s
    really informative. I’m going to be careful for brussels.
    I will be grateful in case you continue this in future.

    Lots of people will likely be benefited from your writing.
    Cheers!

    Feel free to surf to my homepage: Most Effective Massage Techniques

  12. easyhoster

    Par contre, avant de vous lancer dans un travail de rédaction fastidieux, prenez le temps de définir une bonne poignée d’expressions clés (plus ou moins longues) sur lesquelles vous souhaitez vous positionner dans les moteurs de recherche. Ensuite, pour chaque expression clé, votre objectif sera de : Pourquoi l’hébergeur EasyHoster est-il fiable et sécurisé ? Tous les serveurs cPanel sont monitorés 7j/7 24h/4, avec un Firewall Premium Imunify360 et des données répliquées dans 3 pays. En quoi le support technique d’EasyHoster est-il meilleur ?

  13. alanya escort

    You’re so awesome! I don’t believe I have read a single thing like that before. So great to find someone with some original thoughts on this topic. Really.. thank you for starting this up. This website is something that is needed on the internet, someone with a little originality!

  14. Nell

    Sеbelum terhadap metode beгikut, dengan media yang berҝualitaѕ terkini kami pastikan material konstruksi harus
    terbukti pada laboratorium kami dengan akurat.
    Biar, kepіɑwaian Beton Jayamix jadi perѕis serta
    statusnya tambah terjaga.

    Fеel free to visit my page; Harga Ready Mix

  15. Kali

    Definitely believe that which you stated. Your favorite reason seemed to be on the
    web the easiest thing to be aware of. I say to you, I certainly get irked
    while people consider worries that they plainly do not know about.

    You managed to hit the nail upon the top and also defined out the
    whole thing without having side-effects , people
    can take a signal. Will probably be back to get more.
    Thanks

    Also visit my homepage :: установка кондиционера в Минске

  16. Anja

    Amazing blog! Do you have any suggestions for aspiring writers?
    I’m planning to start my own website soon but I’m a little lost on everything.
    Would you propose starting with a free platform like WordPress or go for a paid option? There are so many options out there that I’m totally confused ..
    Any recommendations? Thank you!

    Also visit my web blog :: Functional Medicine

  17. Nichol

    I believe everything composed made a bunch of sense. However, what about this?
    what if you added a little content? I am not suggesting your
    information is not good., but suppose you added a post title that grabbed a person’s attention? I
    mean Sunt in culpa qui officia desent mollit anim – The International
    Society of Creatine Kinase Research is kinda plain. You could look at Yahoo’s home page and see how they create
    article headlines to get viewers interested.
    You might add a related video or a pic or two to grab
    readers interested about everything’ve got to say.

    Just my opinion, it might bring your posts a little livelier.

    my web page; sv3888