Why SUSPENSION Matters - Stu Preston

Описание к видео Why SUSPENSION Matters - Stu Preston

Today I had a chance to chat with Stu Preston of Jack's Cycles about Why Suspension matters on Trials Bikes.

To get in touch with Stu, you can reach him @ 207-337-1274

And his website https://jackscycles.com/


To see the full 6 part video lessons, visit
https://www.trialsprogression.com/cur...


***Video notes***

Stu Preston of Jacks Cycles. Trials rider since 1974. In 2003 won FIM title as a vet rider for North American Champion. Has had direct contact with Adam Raga regarding how to tune suspension. His shop is the only factory authorized service for Reiger shocks. Been working with since 2013.



What weight riders are typical trials bikes set up for?

160-180 lb riders is what these bikes are designed for with the target weight of 170 lbs (7kg).

When you are significantly above or below that weight, the bike is not going to perform at it's optimal capacity.

Used bike considerations as far as suspension settings

Linkage is in good shape - no drag in range of motion
Swing arm pivots
Start with factory preload recommendations and clicker settings
Consider getting the shock serviced - Nitrogen, Bottom out Stopper


Why Suspension Set Up is Important

Ride Height and Steering Geometry. Rider weight, Spring Rate and Preload
Heavier rider, squatting in the back, front end pushes in the turns
Bump Reaction - Obstacles, Unload moves and hopping
You will have better progression with a bike that is set up properly for you. There is still so much that you can learn even without changing anything in the suspension and the beginner has so much to learn, but ultimately optimizing the bike especially as you progress makes a big difference.


Steps to Setting up the Suspension

Step 1 - Setting Preload or Ride height of the bike
Correct Spring rate on bike for your weight (Usually 1 step up from stock spring for each 15-20 lbs of additional rider weight)
Add 10 mm of preload for a Reiger shock - can go up or down 3mm of preload as needed

Free Sag depends on brand - GasGas, TRS, Vertigo sit at full ride height. Others (including Sherco, Scorpa, Beta) usually have 5-15mm of free sag

Step 2 - Setting Preload on the Front End Forks
25-35mm of Free Sag in the Forks are good numbers to work with (can also start with stock settings if they are listed
Want the bike to be balanced front to rear
Need to test ride turns in cambers to really get a preferred feeling

Front Springs may need swapped out to a stiffer set of springs if you move 3 steps or more up on the rear spring. Moving 2 steps or less, you can usually get balanced by just adding more fork preload. (ie - Stock bike comes with a 70nmm spring. You go up past 72.5, and 75. You get an 80nmm - Then you will want to replace fork springs to a stiffer spring rate.

Step 3 - Adjusting Damping Clicker Settings
Start with the stock settings
If you get a stiffer rear shock spring, then the rebound will have to work harder, so generally speaking, you will want to slow the rebound, (increase damping) to control that stiffer spring.

If you really want to feel the difference, move the clicker settings at least a few at a time.
Bracket test on a hillside and over obstacles.

If you are in the USA - Jacks Cycles is the place for all things suspension. You can reach out to Stu Preston via the web or phone

Jackscycles - Trials Motorcycles, Moto Trials Service

72 Mountain Road, South Berwick ME 03908

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