Soarezito
New Member
Wonder if anyone has the correct number for sag without rider, and for an 80kg rider.
Thanks.
Thanks.
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This is true but because it is not intuitive I will unpack it if I may. Say the measured rider sag is 55mm and the target is 40mm. I crank on a bunch of preload and reach the target of 40mm by adding compression on the spring before the rider gets on the bike. After adding preload the rider sag is now 40mm but the free sag is less than 5mm. The suspension is almost topped out, at the top of the travel with just the weight if the bike on the suspension. The weight of the rider blows right through the preload on the spring so the spring was too soft for the rider weight and target sag was achieved only by excessive preload.Static sag and race sag together helps identify if your spring is to light or to stiff for your weight. If after setting your race sag you have no static sag your spring is to soft. With the correct spring rate once race sag is set your static sag should be in the ball park.
There is no preload adjustment that can compensate for the wrong spring rate...........
This is true but because it is not intuitive I will unpack it if I may. Say the measured rider sag is 55mm and the target is 40mm. I crank on a bunch of preload and reach the target of 40mm by adding compression on the spring before the rider gets on the bike. After adding preload the rider sag is now 40mm but the free sag is less than 5mm. The suspension is almost topped out, at the top of the travel with just the weight if the bike on the suspension. The weight of the rider blows right through the preload on the spring so the spring was too soft for the rider weight and target sag was achieved only by excessive preload.
This is actually not true if the spring is too hard. It would also be impossible to get both settings. If the spring is too hard then little to no preload is required to set rider sag but the shock or fork will still top out or nearly top out under free sag.I agree, there is no way to achieve both settings if you have to soft of a spring. But if once the preload is set for the riders weight and you never bottom out, static sag is not very important. The spring then would not be too soft for your riding style and terrain.
Rider sag should fall in a range of 34 to 45 mm which is .25 to .33% of fork travel.
This is actually not true if the spring is too hard. It would also be impossible to get both settings. If the spring is too hard then little to no preload is required to set rider sag but the shock or fork will still top out or nearly top out under free sag.
The spring rate is in the ball park if preload can set target rider sag and have