Quote:
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Originally Posted by 21QUEST
Quote:
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Originally Posted by PeterM
Okay.
You sit the bike vertical on its tyres and measure from the ground to a fixed point on the bike near the line with the axle, front and rear.
From there have somebody hold the bike vertical and climb on board, assume the normal riding position. Have a 3rd person re-measure from the ground to those points.
There should be the 25mm difference between these two measurements.
This is simply referred to as setting the sag, I have never come across anyone who breaks it up into 'bike' and 'rider' sag as the only one that matters is with the rider on board. Logically this is because the weight of the bike is a constant but the rider weight changes and the suspension needs to be set up to compensate for this.
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Wrong again. Oh really?
Okay lets go with rider sag. What you are looking for the the difference between the measurements of the suspension unloaded(topped out) and the suspension loaded(rider)
Front : USD> measure the distance from the dust seal to the bottom of the stanchions . For RWU forks(sv etc)> measure from the dust seal to the bottom of the bottom yoke.
Rear vertical measurement from the axle to anywhere above say seat unit subframe etc.
Now plunk the rider on board and take measurement at same points. Difference is your rider sag.
As an aside it is agueable that bike sag is more important than rider sag . Think about it 
Cheers
Ben |
Firstly, thanks to bikeageboy for putting that link up, now I understand what you are all on about when referring to static and rider sag. Us simple Australians by and large don't bother about getting sag set until you have the correct weight springs installed in the first place.
Silly me, I thought that we might use the collective research that has already been put into spring rates by suspension companies and have at least worked out whether we have springs of an adequate rate in our bike or whether different ones are required. This MUST be your starting point. Like jetting, if your mains are wrong you are wasting your time doing anything else.
Funnily enough, reading through that link confirmed the measurements that I listed in the first post, assuming the correct spring rate is fitted. Therefore I'm not really sure why there has been the huge carry-on and to say that what I posted was "dangerous" is farcical.
GSPEN - according to the racetech website, for normal street riding you would be looking at 0.745kg/mm springs, stock are 0.706 kg/mm. The softest springs listed by them are 0.8 kg/mm but perhaps another manufacturer has a softer one.