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Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders Discuss Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders problems, advice, and/or how tos.

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  #1  
Old 23rd January 2010
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Default 5 degree rake

Hi,

Went ahead and had a new triple tree with a 5 degree rake installed on my 01 - sporty using my 39 mm stock forks. Most of the time people will put on new fork tubes 2 inches longer. However the mechanic told me there was no need because a 5 degree rake wasn`t enough to warrant putting on the longer fork tubes. While l have not ridden the bike yet, everything looks correct and the bike while lower seems to be fine. Does this setup sound like it should work?

Thanks,
Paul
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  #2  
Old 23rd January 2010
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I used a lowering kit on mine with 5 degree trees. Longer tubes make the bike sit unnaturally high on the front and looks like crap. I am sure you will be fine. I had mine setup with 12 inch rear shocks and the tubes were up an extra inch in the trees.
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Old 23rd January 2010
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I went with 4* and -2" springs and it's still not level.Close but still up a little.
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Old 23rd January 2010
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You'll be fine..My bike runs a 3* rake with stock tubes..with 11-3/4" shocks
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Old 23rd January 2010
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If it rides fine then its fine. The test will be on highway rides. If it feels stable on the highway then you're golden. If not, you might want to raise the front (add length to the forks).
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Old 23rd January 2010
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Thanks everyone, l appreciate the input. Will post some pictures of the bike shortly.
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Old 23rd January 2010
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My WAG is you reduced your trail about 3 inches from stock with 5 degree trees. That may leave you with 1-2" of trail.

I guess the real test will be no hands on the bars at speed

For peace of mind I'd use a trail calculator just cause I like to know.
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Old 23rd January 2010
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You don't need a calculator. Just have someone sit on the bike. Take a yardstick, tape measure or laser pointer to point from the neck to the ground. Mark where it hits. Then drop a line straight down from the axle (I hang the tape measure from the axle point). Mark where it hits. The difference is your trail.
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Old 23rd January 2010
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Quote:
Originally Posted by RacingJake View Post
My WAG is you reduced your trail about 3 inches from stock with 5 degree trees. That may leave you with 1-2" of trail.

I guess the real test will be no hands on the bars at speed

For peace of mind I'd use a trail calculator just cause I like to know.
I fully agree....theoretically, or at least on paper, 5 degree raked trees alone leaves me with a negative trail....adding 3 or 5 degree raked neck cups, compensates for the trail the trees eat, and brings things back close to the stock trail.

A trail calculator showed that with 8 degrees between the trees and neck cups, 4" over stock tubes had no effect on the trail.
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Old 23rd January 2010
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Default

A couple pictures with 5 degree rake and stock forks and tubes

http://xlforum.net/photopost/showpho.../51881/cat/500

http://xlforum.net/photopost/showpho.../51882/cat/500
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