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Old 04-26-2013, 04:48 PM   #1
XL-erate OP
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Custom Fork Mods....

Hi folks!

Just thinking about Steering Fork modifications for a sidecar rig.

I'm guessing that some companies that do mods to reduce Trail may weld up the Triple Tree parts and then redrill fork tube holes in brackets at a new angle to reduce Trail? Others may fabricate new Triple Trees?

Seems like it might be possible to simply install triple tree in a solid jig for accurate alignment and zero movement, then over-bore existing fork tube holes at the new desired angle. Then fabricate a simple tubular spacer insert for oversized triple tree holes, to take up gap of old tubes with new larger hole.

Tubular spacer would need a slit down the side so it can compress. May want to fab spacer so there's a slight ridge at top and bottom edges to help keep it from walking up and down in new triple tree hole.

Seems to me this would be one of the easiest and cheapest methods to reduce Trail, yet as effective as custom triple trees? I would assume [uh-oh] that most topnotch machine shops can do this. Thanks for any feedback!
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Old 04-27-2013, 03:07 AM   #2
Bobmws
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Sounds like an elegantly simple solution. My first thought is that there may not be enough material in the outer edges of the tree to retain significant strength. I guess the amount of movement would vary with each bike.
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Old 04-27-2013, 05:25 AM   #3
MotoJ
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What you're thinking of is close to this at Liberty:

http://www.sidecar-industry.com/trip...tripletree.htm

Liberty makes lowers and modified upper clamps.
Bobmw is right- there's not enough material to hog out the lowers to increase the rake.

http://www.perrysmotorcycles.com/


Perry's solution of all new billet trees is elegant and is pretty cheap.
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Old 04-27-2013, 08:19 AM   #4
XL-erate OP
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Thanks, guys!

I thought it was too simple....
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Old 04-28-2013, 06:32 AM   #5
leejosepho
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I have decided to just leave my forks as they are, but I believe there is a simple way to move the entire assembly forward a bit by adding a second second set of trees behind the first and attaching the two together.
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Old 04-28-2013, 07:54 AM   #6
NitroMax
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In the Netherlands they are called "Ed Pols platen", when you Google that you'll find info and pics



Here's some info on Halflive's page ( in Dutch )

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Old 04-29-2013, 12:31 PM   #7
claude
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Quote:
Originally Posted by leejosepho View Post
I have decided to just leave my forks as they are, but I believe there is a simple way to move the entire assembly forward a bit by adding a second second set of trees behind the first and attaching the two together.
This type of sysem is nothing new and has been done ... and does work quite well . One good thing about it is that it does not change the angle of the forks and still reduces trail. It also does not affect ride height which can b egood. 'Raking ' the forks with different trees or modified trees can cause complications with various things such as bar mounts, bar mounted fairing clearances etc. The system of moving the whole fork assembly forward does not create these issues and retains the stock triple trees. Yes, there are other issues even with this sytem with fixed fairings and so forth but over all It is a good system. We have discussed producing this type of an item for quite a while and may still do so at some point.
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claude screwed with this post 04-29-2013 at 12:50 PM
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