Author Topic: Forks rake and trail for a 1925 Douglas  (Read 5514 times)

0 Members and 1 Guest are viewing this topic.

Offline gsx1100s

  • Senior Member
  • ***
  • Join Date: Jul 2005
  • Posts: 167
  • Location: Croydon,Victoria , Australia
Forks rake and trail for a 1925 Douglas
« on: 14 Oct 2013 at 03:58 »
Hello all , I hope this finds you well. i am in a bit of a quandry with the forks on my Douglas. there seems to be nothing worng with the layout of the forks but there is a pronounced gap between rear of front wheel and frame of Douglas. IE it looks like they are sagging. There seems to be no signs of stress on frame at head stock or in the forks themselves. Sorry i cant supply pic . I have not the technology at hand at the moment.Will be rectifying this soon.
I hope this is enough info to get some feedback on how i should proceed .
 Regards Michael
"My first car was a motorcycle"

Offline Ian

  • Master Member
  • ****
  • Join Date: Jul 2004
  • Posts: 1316
  • Location: The Oaks, NSW, Australia
Re: Forks rake and trail for a 1925 Douglas
« Reply #1 on: 14 Oct 2013 at 04:52 »
Don't know if this helps - from the centre of the front axle to the front of the lower frame on my 23 model is just over 43cm

Offline eddie

  • Master Member
  • ****
  • Join Date: Mar 2006
  • Posts: 1827
  • Location: Hampshire, UK
Re: Forks rake and trail for a 1925 Douglas
« Reply #2 on: 14 Oct 2013 at 06:50 »
Michael,
              According to the works drawings, both the '24 RA and the later DT models both had the forks raked at 25 degrees. Hope this helps.
         Regards,
                         Eddie.

Offline gsx1100s

  • Senior Member
  • ***
  • Join Date: Jul 2005
  • Posts: 167
  • Location: Croydon,Victoria , Australia
Re: Forks rake and trail for a 1925 Douglas
« Reply #3 on: 14 Oct 2013 at 08:16 »
As always, imindebted to you both, off to get my measuring tape and compass!   :)
Thanks again
Cheers michael
"My first car was a motorcycle"

Offline cardan

  • Master Member
  • ****
  • Join Date: Jul 2007
  • Posts: 1435
  • Location: Adelaide, South Australia
    • Leon's Vintage Motorcycle Page
Re: Forks rake and trail for a 1925 Douglas
« Reply #4 on: 14 Oct 2013 at 12:33 »
Hi Michael,

Let's hope it's just that the forks have the wrong links; but do keep worrying until you've located the source of the problem.

At the recent veteran rally, there was a very nasty accident caused by a snapped steering tube on the fork of a veteran BSA. Sometimes this causes the wheel to sag out in front (like a chopper, and your bike), but in this case it folded underneath the machine and the bike and rider hit the road hard. Luckily it seems the rider escaped serious injury.

The moral is that you can't be too careful with front forks!

Leon

Offline gsx1100s

  • Senior Member
  • ***
  • Join Date: Jul 2005
  • Posts: 167
  • Location: Croydon,Victoria , Australia
Re: Forks rake and trail for a 1925 Douglas
« Reply #5 on: 16 Oct 2013 at 06:15 »
Thanks Leon for your timely warning
fortunately the Douglas isn't quite road ready .good to hear the rider was ok, sounded nasty :(

Regards michael

PS does anyone know if  we have any close up shots( on this site) of the girder forks commonly used for the douglas?
Could be a good way to see if there is a problem with set up.thanks again
"My first car was a motorcycle"

Offline Ian

  • Master Member
  • ****
  • Join Date: Jul 2004
  • Posts: 1316
  • Location: The Oaks, NSW, Australia
Re: Forks rake and trail for a 1925 Douglas
« Reply #6 on: 16 Oct 2013 at 07:24 »
There are a number of good photos in the members gallery showing good detail of TS models

Offline Jim

  • Full Member
  • **
  • Join Date: Mar 2011
  • Posts: 29
  • Location: Victoria, Australia
Re: Forks rake and trail for a 1925 Douglas
« Reply #7 on: 17 Oct 2013 at 00:28 »
Hello Michael, you may have your headstem tube in backwards which would give the symptoms you describe, the spindle hole is to the rear where its offset, regards Jim

Offline gsx1100s

  • Senior Member
  • ***
  • Join Date: Jul 2005
  • Posts: 167
  • Location: Croydon,Victoria , Australia
Re: Forks rake and trail for a 1925 Douglas
« Reply #8 on: 17 Oct 2013 at 02:43 »
Hello Michael, you may have your headstem tube in backwards which would give the symptoms you describe, the spindle hole is to the rear where its offset, regards Jim
:oops:
 :roll:
 :lol:
Of course the bleeding obvious.
I would like to say in my defense that that's how it came, and that I haven't dismantled it,
And other muttered comments as I shamefully turn the head stem tube the correct way
Talk about not seeing the forest for the trees!
I hope this was a lesson to you all ....... :wink:
Thanks Jim and everyone else.
I hope this gave you a chuckle

Cheers Michael (or "wrongway " as I might now be known!!)
"My first car was a motorcycle"

 

motorcycle