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  1. Replies
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    We'll see. I do not see how you reach that...

    We'll see.



    I do not see how you reach that conclusion and it is not what I am assuming. The only way for a rider to be pitched over the bars while braking is to continue to apply the brakes...
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    It's not "exactly" what you said. My point is...

    It's not "exactly" what you said. My point is that if you are on a hill steep enough to get in front of the contact patch, the hill is no longer a hill but a cliff. You would be falling down the...
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    Fenders aren't going to magically make people...

    Fenders aren't going to magically make people want to ride when it is cold. Nor are dynamos, panniers, IGH or any of a number of other items. People don't ride in the winter because they think it's...
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    A coefficient of 0.9 is high for tires from what...

    A coefficient of 0.9 is high for tires from what I've seen. Between 0.7 and 0.8 is what I commonly see for rubber on asphalt.

    The 0.9 g (8.8m/s^2) value that I have calculated for stopping is...
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    As Yellowbeard says, it can be calculated. ...

    As Yellowbeard says, it can be calculated. Wilson's book (see post 92 for a reference) has the formula for calculating the deceleration. The example I've cited is for a 170lb rider on a bike with a...
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    If, as Wilfred Laurier says, if nothing is done...

    If, as Wilfred Laurier says, if nothing is done by the rider they will eventually go over the handlebars. The rate of deceleration will remain the same until the rider reaches that point where...
  7. Thread: Dogs ??

    by cyccommute
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    People oversimplify the dog problem as well. Not...

    People oversimplify the dog problem as well. Not all dogs react the same way but they react in similar ways. While pit bulls get a lot of bad press in the US, breeds like Jack Russell, Labrador...
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    Yes, the rider center of gravity is shifted...

    Yes, the rider center of gravity is shifted forward but that has no effect on the rate of deceleration. If the rider does nothing, the deceleration will remain the same regardless of the height of...
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    As you've already found with your current bike,...

    As you've already found with your current bike, it is not cheap to build a bike. With your low budget, it would be far cheaper to buy new. You may be able to find the frame and fork and wheelset...
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    I did read what you said and I see no...

    I did read what you said and I see no contradictions. You can't skid a front tire on a bicycle on dry pavement. Period. The rider will be thrown to the ground before the front wheel slides. Even...
  11. Thread: Dogs ??

    by cyccommute
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    Shows how little you understand about dogs. Dogs...

    Shows how little you understand about dogs. Dogs may be primal but they have also been breed over 10,000 years to be docile, especially if compared to their canine ancestors. A dog that challenges...
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    No, we don't agree. In a pitch over situation on...

    No, we don't agree. In a pitch over situation on a dry surface, the front wheel on a bicycle can continue to rotate. If you stop the wheel, the wheel doesn't slide but the rider and bike, i.e. the...
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    Try again. Why would the maximum deceleration be...

    Try again. Why would the maximum deceleration be less when the wheel is 6" off the ground as opposed to 2" off the ground? There is no physical reason for this to occur. If you think it is, show...
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    You missed the other part of what I said. If you...

    You missed the other part of what I said. If you are simply stopping a wheel from rotating, that is not a skid. If you are stopping a wheel from rotating and converting from rolling friction to...
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    A rider isn't going to go over the handlebars...

    A rider isn't going to go over the handlebars until such time as the center of mass of the system is in front of the tire patch. If you find your center of mass at the point where the center of mass...
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    That's exactly what you asked. If you were...

    That's exactly what you asked. If you were asking something else, it is unclear what you are asking.
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    I provided you with a quote. There is no...

    I provided you with a quote. There is no "interpretation" on my part. That is what Wilson wrote. It's pretty hard to take a statement like "...before he risks going over the handlebars..." and...
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    Depends on the vehicle. Without the front wheel,...

    Depends on the vehicle. Without the front wheel, all of my bikes can stand up in my 1999 Tahoe. That's for 19" mountain bikes and 58cm road bikes with long seatposts. I doubt the same could be...
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    No. Stopping a wheel from rotating is different...

    No. Stopping a wheel from rotating is different from a skid. A skid is sliding friction. You can slide a wheel out during a turn but that is different from a straight line skid of the front wheel.
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    I won't quote the whole page but he goes through...

    I won't quote the whole page but he goes through the calculations for determining the deceleration on a specific bike and rider. At the end of the discussion he say:



    Bicycling Science, 3rd...
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    Actually it's a straight forward cable adjustment...

    Actually it's a straight forward cable adjustment but I agree with your assessment. Especially considering that this is a new bike.

    KingweezieIII: your cables have stretched. This is normal for...
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    You are right for the rear wheel. But you can't...

    You are right for the rear wheel. But you can't skid a front wheel on a single bicycle. The bike and rider will rotate around the front hub before the front wheel will slide. We don't have enough...
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    And I have explained to you your error in...

    And I have explained to you your error in thinking that the "pitch over" point is when the rear wheel just leaves the ground. A "pitch over" can also be called an endo, a header (from the days of...
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    No, it's exactly the same. If both lights have a...

    No, it's exactly the same. If both lights have a single emitter, modern LED generator lights put out about as much light as modern LED battery powered. But old incandescent systems aren't...
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    In over 30 years of mountain bike riding, I've...

    In over 30 years of mountain bike riding, I've never heard any mountain bicyclist say that they used only the front brake in any situation, especially in technical situations. Depending on the front...
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