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  #21  
Old 23rd September 2013
SkinnyBill's Avatar
SkinnyBill SkinnyBill is offline
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Quote:
Originally Posted by Dooce View Post
The steering is just a bit heavier, but no fork flop at parking lot speeds. Very comfortable feel. It's only 3 degrees (the slightly longer forks add a tiny bit more). But if the bike had been twitchy before the raked cups (it wasn't), it'd be less so now. Very solid and stable at speed. If you have any room in the tubes above the top tree you might experiment and slide your forks down in the trees a bit.
Be VERY careful using raked cups or trees on a stock frame!!
The raked cups will make your bike MORE twitchy-- You've decreased your trail because you have moved your front axle forward without changing the rake of the frame (raking the frame neck has the opposite effect of raked trees and cups)

You may not notice a difference at all with the 3 degrees... or you may not notice a difference until you pass a tractor trailer at 70mph and your bike goes into a hard wobble. Measure your trail. Do some research, and make sure that your trail is in a reasonable range. The only way to know for sure that you're safe is to measure it - preferably while you are sitting on it.

My first sportster (not my first bike) was a used '99 that had a custom wide-gllide front end with 6 degree raked trees. it had a sweet stance, alot like yours. I nearly died on that thing twice, and after alot of time and research, realized that I was running a bike with almost 0 trail.

Hope you don't take this as me trying to piss all over your project. It looks awesome, and I'm a huge fan of raked front ends... Just want to share my experience if it can help keep a fellow rider safe.

Bill
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  #22  
Old 24th September 2013
Dooce Dooce is offline
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Quote:
Originally Posted by SkinnyBill View Post
Be VERY careful using raked cups or trees on a stock frame!!
The raked cups will make your bike MORE twitchy-- You've decreased your trail because you have moved your front axle forward without changing the rake of the frame (raking the frame neck has the opposite effect of raked trees and cups)
. ..
Hope you don't take this as me trying to piss all over your project. It looks awesome, and I'm a huge fan of raked front ends... Just want to share my experience if it can help keep a fellow rider safe.
Bill
Bill, I appreciate your concerns. The raked trees do reduce trail like you said. But using RB's rake/trail calculator showed that the raked cups have the same effect as a frame-neck take: they increase trail.

My calculated trail numbers show trail at about 3.25" with the bike as now configured. But you're right, and I'm gonna measure the actual bike to be sure.

BTW, I'm a Bill too. :-D
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  #23  
Old 8th April 2020
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Default need help !

How to install Vulcan Fork Cup Set, 3 Degree Rake, 2004- Up Harley XL Sportsters. Did you make a video of it be chance?
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  #24  
Old 8th April 2020
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I hope you realize this post is 7 years old and the OP hasn’t posted here in 3 years. Hope he’s doing OK.

You need some special tooling to do it. Vulcan provides a print that shows dimensions.
It seems pretty straightforward if you use the tooling.
I don’t think I’d attempt it without the angled drivers etc..

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  #25  
Old 9th April 2020
kitabel kitabel is offline
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RB's rake/trail calculator showed that the raked cups have the same effect as a frame-neck take: they increase trail

That's wrong, trail is reduced.
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