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Technical Articles   Technical Articles covering suspension issues, including Spring force, Spring rate, Progressive, Dual-rate, Digressive, Top-out springs, Sag, Preload, Leverage, Linkages, Myths and Misconceptions, Damping and Oils, Maintenance. Set-up and Tuning Method.   Technical
p FAQ:
 
...This suggests we should just have long travel suspension, soft springs and a heavy bike. That’s fine if all we care about is comfort... Springs The Basics

 


...This suggests we should just have long travel suspension, soft springs and a heavy bike. That’s fine if all we care about is comfort...
The catch is, if you try reducing the sag by increasing preload, you’ll find yourself riding along in the zone where the top-out spring is still operating. Which means the spring rate is 30-40% stiffer than it should be, and it will feel harsh! Sag and Preload
 

...The catch is, if you try reducing the sag by increasing preload, you’ll find yourself riding along in the zone where the top-out spring is still operating...
 
 
  Springs The Basics (Part I) Sag + Preload (Part II)  
    What if I change gearing? - This can actually have a big effect. Every change of total sprocket teeth by 1 will require moving the axle back or forward by 4mm...    
  What if I combine a dual-rate main spring with a top-out spring? ...it depends on the relative lengths of the various spring components... What if I combine a dual-rate main spring with a top-out spring? ...it depends on the relative lengths of the various spring components... What if I change gearing? - This can actually have a big effect. Every change of total sprocket teeth by 1 will require moving the axle back or forward by 4mm...
 
 
  Springs Advanced (Part III) Leverage + Linkages  
       
  ...Yes, but it depends. It's not just the chain, but the fact that the tyre is pushing back against the road... "Does the rear actually RISE under acceleration?...
...Yes, but it depends. It's not just the chain, but the fact that the tyre is pushing back against the road...
A change in oil level will affect the air compression; it does not affect damping. However, too large an air gap in forks may cause forks to dive too fast... A change in oil level will affect the air compression; it does not affect damping. However, too large an air gap in forks may cause forks to dive too fast...  
  Myths + Misconceptions Damping + Oils  
       
  ...there's a lever ratio that multiplies any clearance in any of the linkages;  0.5mm wear at the shock pivot can stack up via lever ratios and bearing internal clearances to be 4mm or 5mm at the wheel, resulting in loss of traction. Diminishing suspension performance is subtle; deterioration is gradual so most riders don't notice it happening.
Authors: Graham Byrnes PhD;
Peter Clements ProMechA
 
  Maintenance    
       
 
Where do you start when a new suspension adjuster setting is needed?  The following method will give you the "first big step" in getting to a baseline setting. From here you can begin to fine tune set-up. 
 
     
  Roadbike Set-up and Tuning Method
Dirtbike Set-up and Tuning Method
 
  Roadbike Set-up and Tuning Dirtbike Set-up and Tuning  
     
     
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