Spring preload - Honda Motorcycles - FireBlades.org
Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

User Tag List

 
LinkBack Thread Tools
post #1 of 6 Old 09-26-2003, 3:14 AM Thread Starter
 
Join Date: 05-27-2003
Posts: 44
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 0
 
Re: Spring preload

I just learned @ school that spring preload doesn't effect the stiffness of the spring, only the ride-height. I'm still a little confused, even after my instructor tried to explain it to me. It seems to me that if you compress a spring and hold it there, it will be stiffer to movement. Any thouhts on this, those of you with technical knowledge?
tyronin is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old 09-26-2003, 4:46 AM
 
Join Date: 08-28-2001
Posts: 3,203
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 0
       
Re: Spring preload

'stiffness' as in spring rate, no, that wont change. Thats a factor of the coil diameter, number of coils, wire diameter and material, etc.
G-Force Junkie is offline  
post #3 of 6 Old 09-26-2003, 6:02 AM
 
HondaGalToo's Avatar
 
Join Date: 12-29-2001
Location: New Jersey, USA
Posts: 6,731
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 31
             
Re: Spring preload

Yup, what G-force said. The preload adjustment on your bike is used to set sag, which is how much the bike sags when you sit on it. That's oversimplifying; if you want to know how to set the sag, do a search or ask and we'll go into that. If your spring is too soft for your weight, it will sag too much, even if preload is maxed out. Conversely, if the spring is too stiff for your weight, you won't be able to get the bike to sag enough, even with preload on the softest setting. The sag on the front should be around 35 mm and the rear should be around 28 mm.
HondaGalToo is offline  
Sponsored Links
Advertisement
 
post #4 of 6 Old 09-26-2003, 11:27 AM
 
CBRBob's Avatar
 
Join Date: 07-29-2003
Location: Central NJ
Age: 52
Posts: 1,524
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 18
 
Re: Spring preload

Once you have the correct rate spring in the bike (for rider/bike weight) you the set sag, usually 1.25 in. either end. Then you can change ride height (move forks up/down, legnthen shock, =/- washers etc) They are totally different.

Spring rate is what it is. If it's 100 lb/in that means to compress it 1 in. you push 100lbs on it, 2in, 200 lbs etc. It feels harder once its pushed in but the rate is the same. Progressive springs are wound to have at least 2 rates. i.e. 80lb/in for 1st 1in and 105lb/in thereafter. So riding around town gives a softer 'feel' and once you load up the spring (like brake/accelerate hard) it stacks the coils in the lighter area and now works on the heavier area. Sounds good dosen't it? Problem is there is no soloution to every situation for weight/riding style etc with these springs. Best way to set up is the correct straight rate spring for your weight/bike, set correct sag then then set the damping to your preference.

CBR Bob
TeamPromotion Coach#29TPM
Rider Ed. of N.J. Inc. Senior RiderCoachRENJ
CBRBob is offline  
post #5 of 6 Old 09-26-2003, 11:11 PM
 
Join Date: 01-22-2002
Location: Austin Texas
Posts: 441
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 18
 
Re: Spring preload

To give an example of how the spring rate works. Take a car that weights 2000 lbs. Manufactures put 100 lb springs on it to hold it up. Now if the springs were just long enough to fit the shock, the car would slam into the ground. But they preload them with a spring compressor 3 inches so that they hold 300 lbs before it's even put on the ground. When it's on the ground it compresses another 2 inches(kinda like sag). Now the springs are at 500 lbs each, 2000 total, but it only takes another 100 per corner to make it drop another inch. It makes for a nice soft ride.
OntheEdge is offline  
post #6 of 6 Old 10-04-2003, 3:45 AM Thread Starter
 
Join Date: 05-27-2003
Posts: 44
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 0
 
Re: Spring preload

OK, I understand more now, it might 'feel' a little stiffer, but the spring rate is the same. I found that my fork springs are too soft for my chunky American ass, need to upgrade to get correct sag. I set my rear spring at about 33mm of sag for street duty, but front is at least 40mm with preload maxed out.
tyronin is offline  
Reply

  Lower Navigation
Go Back   Honda Motorcycles - FireBlades.org > Honda Motorcycle Models > Honda FireBlade

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda Motorcycles - FireBlades.org forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

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

Password:


Confirm Password:
Email Address
A valid e-mail address is REQUIRED. You will not have access to any site features until you activate your account using the activation e-mail that is sent to this address.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
How far before you are at max preload? HyrePower Honda FireBlade 7 11-13-2003 12:24 AM
Bike Handles Like Ass GoatRacer Honda FireBlade 22 10-17-2003 7:14 PM
2001 929 rear shock BushrodW Honda FireBlade 2 08-05-2003 5:31 PM
Important shock spring information for larger guys ondablade Honda FireBlade 4 06-05-2003 10:33 AM
Important shock spring information for larger guys ondablade Honda FireBlade 1 06-04-2003 8:31 PM

Posting Rules  
You may post new threads
You may 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 Off

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