front/rear suspension sag

[Steve Minor]

How does one measure front/rear suspension sag? What is acceptable or desired and how is it adjusted?

 

[Dwight Rudder]

We didn't on vintage bikes.
Dwight

Dwight Rudder
7 time ISDT / E medalist
7 time National Enduro Class Champion.

[imported_n/a]

The rule of thumb is that sag generally increases with age.

Glenn



Edited by - Glenn Sonntag on 06/27/2003  5:11:29 PM

[Richard]

This is from the Works Performance general shock mounting instructions:

With shock fully extended, measure from axle center point to a point on the frame. Record this measurement.

With rider on the seat, bounce on the suspension and let the bike settle. Measure from the same two points. Subrtact the second measurement from the first.

The difference should be between 1" (minimum) and 1.5"(maximum). The amount of settle or sag is a function of the wheel travel. It should only be between 1/4 and 1/3 of the total travel.

If the difference is less than the minimum, reduce the spring preload. If the difference is more than the maximum, increase spring preload.

Mote: If the ride hight is too low, the shock will bottom unnecessarily, if the ride hight is too high, the shock will top out too easily when rebounding from a bump or under hard deceleration.

Hope this helps Steve.

 

[Steve Minor]

Richard....Thanks for the simple and direct answer.

Thanks
Steve