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Measuring rear suspension static sag Measuring rear suspension static sag
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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Old 12 May 2008
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Perhaps methods and terms for setting Sag differ
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Old 12 May 2008
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Quote:
Originally Posted by mollydog View Post
First: there are TWO sag measurements to be made.
Ahem. Think that there are three.

Measure
1. Wheel(s) off ground.
2. Bike on wheels with no load.
3. Bike on wheels with rider in riding position and any load.

The difference between 1 & 2 is Static Sag.
The difference between 1 & 3 is the rider/race sag.

Static sag is important because you can "top-out" the shock under hard braking if there is not enough.

Rider sag, apart from stopping the rear shock "bottoming-out", also maintains the attitude of the bike fore and aft. Too much sag and the bike will look like its dragging its arse and in doing so, change the steering head angle and make the bike handle like a sock of hot poo.


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Old 12 May 2008
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Static sag did NOT change. Go figure. But race sag did.
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Old 13 May 2008
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If I recall right, I am pretty sure Paul Thede (not Keith Code!!! DOH!)
Sorry, never heard of them...

Quote:
Originally Posted by mollydog View Post
...suggests using the measurement between #2 and #3, not #1 and #3 to find Race sag.
I'll go back and look ..... anyway, the above is how I've set up my dirt bikes for 20 years or so. Probably wrong!
Never set a dirt bike up. I think Mark will be using it mainly on roads...

Quote:
Originally Posted by mollydog View Post
PS : and how does one adjust static sag? And what effect would that have?
As far as I know, static sag is established by the manufacturer of the bike. This will normally be around the 25-35mm mark... Even my Valkyrie was only 40mm if I remember right.

The only way to adjust static sag would be as you say, via the springing/linkage.
Some people say that you should also add the panniers/load before you set the static sag. I prefer the load to be added as part of the "rider/race" sag measurement.

On my recent trip I ordered a Wilbers shock for my R100GS to take a 75kg rider with 45-55kg load. The spring on the shock was supplied for that weight range and once the rider/race sag was set it proved AOK, keeping the back of the bike at the right height and with no handling problems.


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