1. Dear Guest, Selamat datang ke forum Cycling-Id.com. Silahkan membaca artikel New Members Guide untuk kenyamanan bersama.

NJS/Keirin

Discussion in 'Fixie dan Track' started by dxtr, Dec 26, 2013.

  1. riaddenoe

    riaddenoe Member

    Warnanya jepang banget!

    [​IMG]

    Wasabi dan jahe temen makan sushi...


    :giggle:

     
  2. dasarbule

    dasarbule Wes Tuek

    ...sangat cantik combinasinya, tapi NJS nggak?
     
  3. dxtr

    dxtr Peternak Sepeda

    hahaha, warna frame inspirasinya dari sushi
     
  4. ooh njs luas kesini jugaa yaa :cool:
     
  5. hmdns

    hmdns #LookProGoSlow

    Wah ini dia, juragan part NJS nongol dimarih ! :D

    Nih om @dxtr kali aja kangen sama doi :giggle:
     
  6. dxtr

    dxtr Peternak Sepeda

    huhahahahaha, saya yg ambil cog dura ace 16t om viki
     
  7. oalah hahaha numpang gabung ya klo gitu hehehe:oops:
     
  8. mau sok tau dikit ah hehe
    knp frame njs nyaman?
    - beberapa orang yg udah menggunakan frame njs merasakan seperti ada shock .
    - bahan steel , steel menerima getaran lebih baik dari jalanan dibanding bahan allu dan carbon
    - jauh tahan lebih lama pastinya
    - dalam pembuatan lebih detail, sebelum mendapatkan sertifikat njs harus melalui uji coba
    - bahan tubing steel juga bermacam2, seperti: columbus , kaisei, honda, reynold

    main2 deh kesini nih
    http://www.kalavinka-bikes.com/track_gallery_04.htm
    hati2 ngiler, kalavinka salah satu frame njs favorit ane yg ngga pernah kesampean haha
     
  9. hmdns

    hmdns #LookProGoSlow

    lah frame2 yang masuk ke situ kan numpang lewat doang Vik hahahaha

    ayo lah rakit lagi sepedanya, gowes lagi, ato masih sibuk turnamen basket?
     
  10. klo yg masuk kalavinka sih ngga numpang lewat nis hahaha
    ntar ah tunggu ada part lagi haha
     
  11. dxtr

    dxtr Peternak Sepeda

    Sepertinya tidak hanya frame NJS saja yang terasa ada shocknya saat melewati jalanan yang bumpy
    Frame fixed gear saya, cuma Jemboly, tapi berasa ada shocknya juga, saya predict mungkin karena metode lugs-nya yang membuat frame terasa flex

    Mungkin karakter steel memang seperti itu.
     
  12. hmdns

    hmdns #LookProGoSlow

    Klo saya lebih berpikir dari ketebalan si tubingnya om. Frame NJS kan ketebalan tubingnya beda2. Dan ada juga yang menggunakan bahan campuran alloy/carbon (sehingga ga 100% steel). Nah bisa jadi, sensasi shock yang dirasakan masing2 frame NJS juga berbeda-beda.

    Mungkin pada Jemboly juga terjadi hal yang sama (perbedaan ketebalan tubing) cuma ya blum ada yang mendalami tentang hal tersebut hehe
     
  13. galihleo

    galihleo Well-Known Member

    kalo flexing memang kebanyakan karakter besi/chromoly seperti itu.. selebihnya dari desain (Ketebalan diamater dalam yang beda-beda/butted) dan konstruksinya..
     
  14. dxtr

    dxtr Peternak Sepeda

    [​IMG]

    ............Despite the glamorous image of Olympic keirin racing, keirin in Japan has a very poor reputation indeed due to its association with gambling. Your average race goer is male, in his 50's or over, smells of tobacco and alcohol, will skip work to visit the track and is most certainly more interested in gambling than cycling. Each time I've visited velodromes in Japan most punters have been indoors, smoking, placing bets and watching numbers flash across monitors rather than out in the stands cheering on the racers.

    [​IMG]

    .........Promoters are trying hard to lift the image of keirin in Japan but are failing miserably as are promoters of Japan's other gambling related sports, horse and motor boat racing. The keirin website has a page encouraging people to "take part". I clicked expecting to find times I could visit and ride the velodrome track, or join amateur races only to discover a page informing me how easy it is to fill out a betting form!

    [​IMG]

    As a tourist visiting Japan who is thinking of heading to the track for an afternoon or evening of entertainment, don't expect to get directions from your hotel tourist desk. Keirin's image here is so bad that I've heard stories of tourist desk staff actively discouraging tourists from visiting the track. Tourist desks will most certainly not have any keirin pamphlets on hand that's for sure, nor will they find it easy to give you directions to the nearest velodrome, its not mainstream enough for that.

    source : here

    Miris :suicide:
     
    hmdns and andytio like this.
  15. dxtr

    dxtr Peternak Sepeda

    What is Keirin ?

    Speed alone is not the key to winning.

    Keirin is a type of bicycle racing. The cyclists ride around a banked track, and the winner is the first across the finish line. But keirin cyclists need more than just speed to win—the strategies they use against each other are an important part of the sport, increasing its subtlety and appeal. Competitors use various strategies to win.
    The battle of wills among the cyclists can be complex, often creating dramatic ups and downs during the race. Once you understand the nuances of keirin, trying to predict race outcomes becomes a fascinating exercise.

    Giving back to the community since 1948.

    Keirin started on November 20, 1948 when the first event was held at the Kokura Velodrome. Since then, the revenues raised by keirin have been adding to the public good in a wide range of areas such as the machinery industry, social welfare, athletic programs, medicine, education and disaster relief.
    Keirin has now become an official Olympic event, making it an internationally recognized sport associated with its country of origin, Japan. Olympic keirin started with the 2000 Sydney Games. Kiyofumi Nagai won a bronze medal for Japan at the 2008 Beijing Olympics.

    [​IMG]

    Cyclist in Keirin
    [​IMG]
    Keirin cyclists battle fiercely for the SS rank, the highest rank which only 9 cyclists can attain.

    There are 2,647 keirin cyclists (as at January 1, 2014). There are six keirin cyclist rankings: SS is the highest ranking, followed by S1, S2, A1, A2 and A3. Only 9 cyclists are ranked SS. Many competitors vie daily for the top rank.
    Ranks are updated twice a year based on cyclists' performance records. Cyclists with continually poor performance have their registration revoked and must retire from keirin. The life of a keirin cyclist is one of tough competition.

    1. Upper body
    In addition to well developed thighs, keirin cyclists need to have powerful upper bodies.
    While leg power is needed to move the bicycle, cyclists also need considerable upper body strength to control the handlebars. Upper bodies need to be as well developed as legs.

    2. Thighs
    Keirin cyclists' thighs are extremely important since thigh diameter is equated with cyclist ability. Keirin cyclists take great pride in their thighs.

    3. Uniforms
    Uniforms and helmets are color coded to help identify each cyclist. Keirin SS rank cyclists have special uniforms!
    [​IMG]

    4. Cyclist shorts
    The color of the shorts worn by each keirin competitor indicates rank. Keirin is a sport based solely on ability, with no consideration given to seniority. After completing keirin school, new graduates can register as competitors by passing a national qualification exam. All newly qualified keirin cyclists begin their careers with an A3 rank, and work their way toward the top rank by competing in events.
    [​IMG]

    Keirin Bicycles

    The bicycles used in keirin are all about speed and power. They are designed to work as a single unit with the cyclist.

    The bicycles used in keirin are all custom-made machines with each part fine-tuned to the unique characteristics of the cyclist. The cyclist and each part of the bicycle work as a single unit for optimum handling of the track's banks.

    [​IMG]

    1. No brakes
    Keirin bicycles are designed purely for speed. Since all parts not needed for attaining high speeds have been stripped off, keirin bikes have no brakes*. Cyclists adjust their speed by pedal power alone.
    *brakeless is cool? brakeless is nuts!! put min. front brake in your fixed gear bike!! seriously, no kidding.

    2. Frames
    The frames of keirin bikes are made of steel designed to combine suppleness and strength (chrome moly steel). Each is handmade by a custom frame builder. Each keirin bike frame is therefore a one-of-a-kind article, duplicated nowhere in the world.

    3. Rear gear
    Unlike street bicycles, the rear gear on keirin bikes is fixed
    * and constantly engaged with the wheel, making backpedaling impossible.
    *im using a fixed gear too in my commuting bike:giggle:

    4. Choice of gear ratio*

    The smaller the gear ratio, the easier it is to pedal. Small gear ratios let the cyclist reach top speed quickly, but require faster pedaling faster to maintain top speed. The larger the gear ratio, the harder it is to pedal. A large gear ratio requires longer to reach top speed, but enables it to be maintained with slower pedaling.

    *The gear ratio is equal to the number of teeth in the gear connected to the bicycle's pedal divided by the number of teeth in the rear gear. The gear ratio of a typical one-speed street bicycle is about 2. Some keirin cyclists use gear ratios of 4:eek:. Riding a bicycle with this gear ratio is like climbing a steep slope in the top gear of a 3-speed bike. Most people would find it impossible to even get moving.

    5. Tires
    The tires of keirin bicycles have an outer diameter of 675 mm and a thickness of 22 mm. They are designed for maximum speed by minimizing the surface area in contact with the track, reducing friction. The 9.5 atmosphere pressure they are inflated to is extremely high in comparison to the 2 atmosphere tire pressure of a typical street bicycle.:cool: (pantesan kentjang sekaleee, up to 70 kmh!!)

    Keirin event grades

    Always dramatic, keirin events are held throughout the year and culminate in the Grand Prix.

    All keirin events are assigned one of six grades: GP, GI, GII, GII, FI or FII.
    Dramatic keirin events are held every day, culminating in the Keirin Grand Prix race held on December 30 of each year.

    [​IMG]

    1. Grand Prix
    Held every year on December 30, the Keirin Grand Prix is the sport's most important event, and determines the year's keirin champion.
    The event is contested by nine cyclists who have competed during the year. The champion is determined in a single race.
    • Keirin Grand Prix (December, single race)
    Championship Prize Money: 100 million yen

    2. GI-grade events
    Open to the top S-rank cyclists. Cyclists who win a GI event are awarded the right to compete in GP-grade events.
    • Yomiuri Shimbun All-Japan Keirin Cup (February, 4-day event)
    • Japan Keirin Championship (March, 6-day event)
    • Prince Takamatsu Memorial Cup (June, 4-day event)
    • Prince Tomohito Cup/World Championship Memorial Tournament (July, 4-day event)
    • All-Star Keirin (September, 5-day event)
    • Asahi Shimbun Cup Keirin Festival (December, 4-day event)

    3. GII-grade events
    Open to all S-rank cyclists. The top-finishing cyclists are awarded the right to take part in GI- and GII-grade events as priority competitors.
    • Kyodo News Service Cup (April, 4-day event)
    • Summer Night Festival (August, 2-night event)
    • Young Grand Prix (December, single race)

    4. GIII-grade events
    Open to all S-rank cyclists. Commemorative keirin events for occasions such as new velodrome openings.
    Keirin velodromes generally hold one GIII-grade event (4-day event) per year.

    5. FI-grade events
    S-rank series
    Open to S-, A1- and A2-rank competitors. Races are generally held in the following combinations:
    • 6 S-rank races + 6 A-rank races (3- or 4-day events) [S-rank and A-rank cyclists never compete against each other in the same race.]

    6. FII-grade events
    Keirin events held throughout Japan, open only to A-rank competitors.
    (3-day events) [Only A-rank cyclists take part. The most common grade of event held throughout the year.]
    * A-rank challenge races (3-squad A-rank races) are 7-cyclist races.

    sumber
     
    joshua08, tato, hmdns and 1 other person like this.
  16. dxtr

    dxtr Peternak Sepeda

    More about Keirin...





    Why they need some bulky protector? wkwkwk:giggle:
    Tough ride eh?
     
    hmdns, joshua08 and andytio like this.
  17. dxtr

    dxtr Peternak Sepeda

    Want more?

    Here they are, some kind of story from Keirin racers, Shane Perkins.....







    Enjoy....

    See you later....
     
    hmdns likes this.
  18. joshua08

    joshua08 Well-Known Member

    jadi?
    kapan Cyc-Id mampir ke Velodrome Rwmangun? biar makin rame
     
  19. mt

    mt Pensiun Dulu

    Sebetulnya nggak beda beda jauh kan ama track?

    Bedanya:
    1. Balapan nya di Jepang, serba pake bahasa jepang (cool effect), yang balapan orang jepang, sepedanya dibuat di jepang.
    2. Sistem balapan nya, point system nya beda. Tapi track racing juga beda2 kan kategori nya?

    Selain itu kok kurang lebih semuanya sama aja. Cuman track sekarang udah pindah ke sepeda carbon, keirin masih tradisional aja. Perlu taktik, ya balapan track juga perlu taktik kan (untuk beberapa category).
     
  20. dxtr

    dxtr Peternak Sepeda

    Lanjut.......







    Enjoy....
     

Share This Page