adding trail to a tailwind

Quoted message said:

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.

I think that adding trail will make your low speed problems worse.

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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.

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Quoted message said:

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

"Mark Leuck" <[email hidden]> wrote in message
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Quoted message said:

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Quoted message said:

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.

Quoted message said:

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.
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