Re: [Frame] Headtube bushings

Green speeds use bushes for the kingpins. While the Logo trikes use 
Headset bearings.
So obviously both are usable - Keeping ball bearings away from water is 
usually a good idea
as it dosen't take much contamination of the grease for corrosion to 
have an effect. That said I know
a couple of Logo trike owners who have the headset style kingpins and 
they have had no problems.
We went for Bronze bushes when we built our Trikes (2 GTE's and a 
smaller one) and they have
worked out fine.
Cheers
Rob

Jeff Wills wrote:

>Actually, trikes are a good application of bushings instead of bearings
>for a kingpin. On a bicycle, you need to have minimal friction, since
>balancing requires tiny movements of the front wheel. Try riding a bike
>no-hands while the headset is adjusted too tight.
>
>On the other hand, a trike *benefits* by having some friction in the
>system. This damps some of the sensitivity to steering inputs that
>otherwise cause the vehicle to dart about at the slightest input. (Of
>course, steering geometry has a lot to do about this, too.)
>
>Our Aerocoupe trikes used Oillite bushings for the kingpins. They were
>1/2" inside diameter by 1" long, and we used 3 stacked one atop the other.
>It worked great, and it was a lot simpler to manufacture than using
>bicycle headsets for bearings. A suitable analog is go-cart spindles:
>http://www.gokartgalaxy.com/spindle_sets_%26_components.htm
>
>Jeff
>
>
>  
>
>>Subject: [Frame] Headtube bushings
>>
>>
>>    
>>
>>>has anyone worked with bushing materials for the headtube bearings? I
>>>      
>>>
>>build
>>    
>>
>>>trikes and I want to work with bushings for some special designs and
>>>need
>>>some input.
>>>      
>>>
>>Although you might be able to use bushings for control rods and steering
>>linkage, there is too much friction in a bushing for head tube usage.
>>
>>Maybe if you supply more info the list could supply more help.
>>
>>Hugh Enox (who has only built one trike so far, so no expert)
>>
>>
>>
>>    
>>
>
>
>
>
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