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Stretch Cruiser & Chopper Motorized Bicycles This area is for sharing all about our custom stretch cruisers and choppers.

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  #11  
Old 11-05-2016, 02:42 PM
MkowaOweno MkowaOweno is offline
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Join Date: Nov 2016
Location: Russia
Posts: 2
Default built a low rider but bike is unstable anyone know why

Id love to see some pictures of bike racks on your TD. Any preference to the front or back of the TD?
I did some searching in the forum, but no luck find any pictures.

Thanks
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  #12  
Old 11-05-2016, 04:21 PM
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racie35 racie35 is offline
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Join Date: Nov 2012
Location: usa
Posts: 1,697
Default Re: built a low rider, but bike is unstable. anyone know why ?

If 20" bikes were wobbly and hard to ride there would be nothing but lawsuits out there....most kids learn on one so I'd guess you changed something drastically.
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  #13  
Old 12-11-2016, 11:44 AM
el Diablo Guapo el Diablo Guapo is offline
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Join Date: Nov 2013
Location: earth
Posts: 103
Default Re: built a low rider, but bike is unstable. anyone know why ?

Bent springer forks introduce more than a mere trail issue, they actually cause the the front wheel to "sweep" instead of "twist."

Imagine standing astride a bicycle with normal forks looking down at the front wheel.
Twist the handle bars, and the wheel twists along directly underneath.

The same experiment with the bent forks will show the wheel to be some distance out in front of the bike so twisting the handlebars and head set results in the wheel "sweeping" in a concentric circle (arc) around the headset. The longer the distance, the greater the effect.

(straight chopper forks introduce another effect as the wheel stops turning, and simply lays or "flops" over instead of turning the bike )

The upshot is; bicycles have evolved to look the way they do for a reason, but it sure is fun to change 'em - you can really feel the geometry!
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