Back to the Progressive fork springs - Page 2 - Triumph Forum: Triumph Rat Motorcycle Forums
Air Cooled Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, Bobber, T100, Speedmaster, America, Thruxton, and Scrambler.

Sponsored by: Triumph Twin Power Ltd

LinkBack Thread Tools Display Modes
post #11 of 12 (permalink) Old 07-12-2011, 11:53 AM Thread Starter
Team Owner
Main Motorcycle: '08 Moto Guzzi 1200 Sport
Senior Member
ohiorider's Avatar
Join Date: May 2005
Location: Hudson, Ohio - USA
Posts: 5,519
Other Motorcycle: 2012 Griso - SOLD
Extra Motorcycle: 1991 BMW R100GS
Originally Posted by 08Bonnie View Post

Have you checked static sag in the front? Should be around 20-25mm. This is the distance your front forks compress with ONLY the weight of the bike. What about rider sag? Should be around 30-35mm. This is the distance the forks compress with the weight of you on the bike. I think this should be your first step.

I had the same issues you describe. My sag #'s were all over the place, after applying some tested theories the ride could not be better.
08 Bonnie - I have not. I do have the Thruxton preload adjusters installed on the forks, so with some luck, unloaded and loaded sag MIGHT fall in the range of the preload adjusters.

I did notice this am after filling gas tank to the top, the additional load on the front end seemed to stabilize things. So, next step was to play with the rear shock preload. The Progressive 440s make this easy, with their hand-adjustable rings. First I noted that I was set very low on preload (one hash mark from no preload at all, which equaled 25 (lets call them clicks - actually visible marks, easily counted). Cranked them in to no preload, worked my way back to 25, then to 50, finally 60. This seems to have eliminated more of the flutter. I believe this would have slightly increased (a) front end loading and (b) reduced front end rake.


GBNF: 03 T100 Luc Org and Silv: 122/42 jets, TORs, 18T, UNI filter, no AI, Polaris bellmouth, Metz 880 tires, Prog. 440 shocks (105/150 springs), 11-1124 frk springs, Thrux frk caps, gaiters, MotoTwin bars, 6024 lamp, htd grips, 12v outlet.
ohiorider is offline  
Sponsored Links
post #12 of 12 (permalink) Old 11-27-2012, 02:52 PM
Formula Extreme
Main Motorcycle: '10 Bonnie SE- aka Maggie
Senior Member
Wheelhorse's Avatar
Join Date: Apr 2010
Location: Illinois
Posts: 775
Other Motorcycle: '82 Suzi GS1100GLZ
Extra Motorcycle: '73 Suzuki TS50
So what ever happened? Last you wrote was the intiminators were out, progressives back in?

Have you decided to stay with that route?

Maggie- '10 Bonnie SE; SAI, 02R, Dom. Touring, DNA Pods, TTP Tune #11 with Stage 1 ign., 36E's
Wheelhorse is offline  
Sponsored Links

Quick Reply
All posts must adhere to Forum Rules

Register Now

In order to be able to post messages on the Triumph Forum: Triumph Rat Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter your valid email address, that can receive an automated confirmation message. Otherwise, you won't be able to gain full access.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
Progressive Fork Springs Johnww Air Cooled Twins Technical Talk 2 03-08-2009 09:34 PM
Cheap progressive springs fork springs uzidzit Air Cooled Twins Technical Talk 2 03-26-2008 12:26 AM
what do progressive fork springs really do? peter_s Air Cooled Twins Technical Talk 17 08-25-2007 03:16 PM
Progressive Fork Springs wonderdog Air Cooled Twins Technical Talk 2 02-05-2007 09:20 AM
Progressive Fork Springs Hinckley Classic Triples 21 01-07-2004 09:27 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On

For the best viewing experience please update your browser to Google Chrome