Cafe racers [pics]

Discussion in 'Old's Cool' started by crazydrummerdude, Jul 27, 2007.

  1. Andyvh1959

    Andyvh1959 Cheesehead Klompen

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    I agree on that assessment. Looks nice, but that section of aluminum in tension is very slim. The most commonly available aluminum being T6061 means it has 40,000 psi tensile strength, per square inch. If we assume T6061, and that section near the thinnest area to be .250 x .250 means an area of 0.0625 sq in. That means that one section can handle an ultimate load of 2,500 pounds pull. If you apply a 4:1 safety factor its quickly down to only 625 pounds force. That does not account for the fatigue factor due to dynamic loading, and aluminum does not like dynamic/fatigue loads.

    Perhaps it is better because there are at least two sections of similar area taking the tensile load (because of the stay arm on each fork leg). But in this case it is best to plan the load on one section in case one does fail at least the other is hopefully still able to take the load. If the holes were reduced to increase the section to .250 x .500 then the load changes to 1,250 pounds force per section.
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  2. pekingduck

    pekingduck Been here awhile

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    Thanks Andy for the further explanation. In a perfect world, the forces on the two anchor arms would be equal, but in reality, it would be difficult to tell how much either side is contributing at any time. Unmatched or unevenly worn brake linings, out of round or non-parallel brake surfaces, improper adjustment, or contamination can cause one side or the other to have the dominant braking force, and you wouldn't be able to tell.

    Additionally, the expansion/contraction from heat that caused these particular brakes to transfer heat to the short spokes, and they would loosen randomly and cause hub distortion.

    The only way to be sure the brakes gave even stopping power was to undo the cable and splitter and run a single cable to test one side at a time.
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  3. motrhead

    motrhead Travellin' Soul

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    Stunning! My ideal cafe racer. I don't need upside down forks, but it has to be Guzzi!
  4. Tanshanomi

    Tanshanomi Your Favorite Uncle

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    My only nitpick is, couldn't the air cleaners be angled in so they aren't in your knees?
  5. lesman

    lesman Live easy, Brake Hard

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    [​IMG]

    Left side photo

    [​IMG]
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  6. lesman

    lesman Live easy, Brake Hard

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  7. lesman

    lesman Live easy, Brake Hard

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    I don't know if it qualifies as a cafe. It's really cute.
    Rumi Sport 125
    I'm a sap for these plunger rear suspension bikes. Didn't care for them on Choppers.
    Love them on BMW's URal's, Chang River, Indians and Harley's . I've forgotten a few brands.
    [​IMG]
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  8. lesman

    lesman Live easy, Brake Hard

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  9. lesman

    lesman Live easy, Brake Hard

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    Harley XR1000
    [​IMG]
  10. lesman

    lesman Live easy, Brake Hard

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  11. bk brkr baker

    bk brkr baker Long timer

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    Only if the tubes [largest part by far ] hold gas and oil. Even then , meh.
  12. Kai Ju

    Kai Ju Long timer

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    I actually don't care how well this one works, or doesn't. It looks stunning.
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  13. lesman

    lesman Live easy, Brake Hard

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    It kinda looks WLWesque on the design Not a big fan of the solid wheel or Firestones but the Bike is just beautiful in execution. It's so simple looking.
  14. Richy

    Richy Been here awhile

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    I bought one like this new. I liked it a lot and not my first new Yamaha, but my last.
  15. Mudclod

    Mudclod Mojo Moto

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    [​IMG]


    Sent from my iPhone using Tapatalk
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  16. pekingduck

    pekingduck Been here awhile

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    c1467a373ea78ae8b2273759f5cd0e28.jpg
    Gas and oil? No, it's fueled by ego. I couldn't imagine a more ridiculous "build" attempt pretending to be a motorcycle. It looks like about a 65" wheelbase. You'd need to have arms like a gorilla to steer it............nuff said.
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  17. JagLite

    JagLite Long timer

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    You do a good job of avoiding the dozens, errr, hundreds of ridiculous custom bike pictures floating around.
    That one is hideous I agree but certainly not the worst I have seen.
    There really should be a thread for stupid ugly custom bikes.
    In a week or so there would probably be 100 pages with thousands of posts.

    I wonder if anyone actually paid money for that? :fpalm
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  18. lesman

    lesman Live easy, Brake Hard

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    I think the attempt was to out Confederate some type of build. I like Confederate's.

    Sent from my Moto G (5) Plus using Tapatalk
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  19. lesman

    lesman Live easy, Brake Hard

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    More Race than Cafe
    [​IMG]
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  20. lesman

    lesman Live easy, Brake Hard

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