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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 14th December 2007
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Question 4" over fork tubes

Ok, I gave up trying to find a cheaper way to get more travel out of my 08 883L forks. So I am going to stretch things out a bit. I like'm long and low.
I'm going with 4 inch over tubes, progressive damper rods and springs (1/4 inch exposed preload spacer), the air fork mod, 3 degree cups and 3 degree trees. The trail works out to between 4.8 and 5.2, depending whos calculator is used with the 13 inch RK air shocks lowered 1 inch. The wheelbase ends up 3 or 4 inches longer while only raising the seat height around 1 inch and the frame rails should end up level to the ground.

My question is; how much oil am I going to need when I install these tubes?

Would I do the measure from the top thing or go with the one ounce over recommened Whittlebeast theory?

If it is gotta be the trial and error method what would be a good starting point?

Thanks in advance!



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Old 14th December 2007
black06883 black06883 is offline
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I too would be curious about these questions being answered. I am looking to get tubes that are only 1 to 2 inches longer to compensate to my much longer shocks.
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Old 14th December 2007
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I'm not an expert here... but I very much doubt that getting longer
tubes is going to give you any extra travel. The travel will still be
limited by the ends in the sliders. won't it?

Gazza
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Old 14th December 2007
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you got it gazza, only longer sliders will give more travel but they don't make such a thing
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Old 14th December 2007
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LOL well there goes my great idea! That explains why the old dirt bikes had sliders that were so long the axle sat a few inches up from the bottom. Hmmm what to do now?
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Old 14th December 2007
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why are you trying to get more travel?
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Old 14th December 2007
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Tubes get longer, the oil level stays the same as wet or dry!!
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Old 14th December 2007
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The other thing that's not coming out right in your calculation is the frame rails sitting level on the ground.....

I've just completed this install and MAYBE, if you did a 6* rake at the trees, you might be close to level, but doing 3* in the trees and the cups, 2" over is the level length you want on the tubes...

4" over lifts the rails about 1 1/2" higher and you'll need an 11" jiffystand from a glide or softail...
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Old 14th December 2007
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Ever ride a bike that has long travel comliant suspension? Gives a great ride. Had an old BMW air head that had long travel set up and thought it would be great on the sporty. But that's just me.
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Old 14th December 2007
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If the sliders are the same as the R models. using a longer tube and springs should increase the travel to that of the R model. i think it will work though you may need to change some other parts like the dampers maybe. A parts break down of the two would show any differences.
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