|04-26-2013, 05:48 PM||#1|
Joined: Mar 2008
Custom Fork Mods....
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!
|04-27-2013, 04:07 AM||#2|
Curmudgeon At Large
Joined: Jun 2005
Location: Astatula, FL
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.
|04-27-2013, 06:25 AM||#3|
Joined: Apr 2011
What you're thinking of is close to this at Liberty:
Liberty makes lowers and modified upper clamps.
Bobmw is right- there's not enough material to hog out the lowers to increase the rake.
Perry's solution of all new billet trees is elegant and is pretty cheap.
The ladies used to check me out...now they just keep an eye on me.
|04-28-2013, 07:32 AM||#5|
Sure, I can do that!
Joined: Jun 2011
Location: 200 miles north of New Orleans
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.
He who so shall, so shall he who.
|04-28-2013, 08:54 AM||#6|
Joined: May 2010
Location: Netherlands, Europe
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 )
1300cc 217Nm/207Hp NOS-injected VMax (1985)
500 cc 1950 BSA chopper (1983)
750 cc CB750 chopper ( 1990)
1200 cc Z1000 dragbike (1976)
300 cc MZ transporthack (1989) winterhack
900 cc BMW R 90/6 hack ( 1976) summerhack
750 cc BMW K 75 RT ( 1993 ) daily driver
Age is an issue of mind over matter. If you don't mind, it doesn't matter ( Mark Twain )
|04-29-2013, 01:31 PM||#7|
Joined: Mar 2002
Location: Middleburg, Pa. (Snyder County)
Founder: Internet Sidecar Owners Klub at SCT
President: C Stanley Motorsports Inc.
claude screwed with this post 04-29-2013 at 01:50 PM
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