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#1
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adding trail to a tailwind
Hiya
I'm sorry if this has shown up for the 4th time. tech problems. Any suggestions on how much trail I should get added to my tailwind? The high speed stability is fine but anything below 7kph / 4mph and the bike is a handful. I was thinkin about 4 inches. The trail is currently in the 1 inch or less range. I have a feeling that the brakepads and rim wall may not line up if the fork is straightened too much. |
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#3
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I'm with you. Adding trail aids high speed stability to the detriment
of low speed stability. If you want low speed stability, lose some trail at the possible cost of making steering twitchy at higher speeds. |
#4
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I have a tailwind and plugged Patterson's equations into Mathcad. His
equations verify exactly what you say below. For example, reducing the fork offset 10% from the measured value to increase trail caused Patterson's sensitivity measure to increase by a whopping 67%. The fork flop nearly doubled. This is not the direction you want to go. Increasing the trail on the Tailwind will make it unridable at low speed. The design is already on the edge at low speed and I have the scars to prove it. "hfhfh" wrote in message ... I'm with you. Adding trail aids high speed stability to the detriment of low speed stability. If you want low speed stability, lose some trail at the possible cost of making steering twitchy at higher speeds. |
#5
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thanks guys
I changed my handlebars to a wider set yesterday and noticed an increased stability at low speeds today. What also seemed to help is having just one hand on the bars at a time. Weird "Samuel Burkeen" wrote in message ... I have a tailwind and plugged Patterson's equations into Mathcad. His equations verify exactly what you say below. For example, reducing the fork offset 10% from the measured value to increase trail caused Patterson's sensitivity measure to increase by a whopping 67%. The fork flop nearly doubled. This is not the direction you want to go. Increasing the trail on the Tailwind will make it unridable at low speed. The design is already on the edge at low speed and I have the scars to prove it. "hfhfh" wrote in message ... I'm with you. Adding trail aids high speed stability to the detriment of low speed stability. If you want low speed stability, lose some trail at the possible cost of making steering twitchy at higher speeds. |
#6
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thanks guys
I changed my handlebars to a wider set yesterday and noticed an increased stability at low speeds today. What also seemed to help is having just one hand on the bars at a time. Weird Samuel Burkeen wrote: I have a tailwind and plugged Patterson's equations into Mathcad. His equations verify exactly what you say below. For example, reducing the fork offset 10% from the measured value to increase trail caused Patterson's sensitivity measure to increase by a whopping 67%. The fork flop nearly doubled. This is not the direction you want to go. Increasing the trail on the Tailwind will make it unridable at low speed. The design is already on the edge at low speed and I have the scars to prove it. "hfhfh" wrote in message ... I'm with you. Adding trail aids high speed stability to the detriment of low speed stability. If you want low speed stability, lose some trail at the possible cost of making steering twitchy at higher speeds. |
#7
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wrote in message ups.com... thanks guys I changed my handlebars to a wider set yesterday and noticed an increased stability at low speeds today. What also seemed to help is having just one hand on the bars at a time. Weird It sounds like you are tying to overcontrol the bike by using 2 hands |
#8
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"Mark Leuck" wrote in message ... wrote in message ups.com... thanks guys I changed my handlebars to a wider set yesterday and noticed an increased stability at low speeds today. What also seemed to help is having just one hand on the bars at a time. Weird It sounds like you are tying to overcontrol the bike by using 2 hands I was thinkin the same thing. I'm surprised that I didn't figure this out years ago. |
#9
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wrote:
thanks guys I changed my handlebars to a wider set yesterday and noticed an increased stability at low speeds today. What also seemed to help is having just one hand on the bars at a time. Weird Handing qualities suggests that we have an anti spring at low speed. The equation for this. The force on the handlebar of the anti spring is weight X B/A X trail X Sin(beta)/Rh B is the horizontal distance from the rear wheel to the riders belly button. A is the wheel base Beta is the head tube angle measured from the vertical Rh is the radius of the handlebar. So increasing Rh will reduce the effect of the anti spring. You did exactly the right thing. I have seen other riders actually add a bungee cord to act as a centering spring to overcome the anti spring. -- Order Lords of the Chainring http://www.calpoly.edu/~wpatters/lords.html Or use pay pal Reply to |
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