Hi everybody. I´m Donato and this is my first message. I wish to learn a lot about bike suspension and the magnific program Linkage.

(Sorry for my ugly English )

To begin, I have a doubt about how to consider the point of equilibrium or SAG.
For a regular user, the way to know the sag of the rear suspension is to know the % of the shock stroke, with the help of the scale or marks and the o-ring on the shock. But (I think) on Linkage you always consider the % of the real axle travel. But both values are conditioned by the Leverage Ratio.

For example, a sag=25% of the shock stroke could be a 30% of the rear travel in one bike and a 35% in another bike depending on the LR. Equally, a 25%sag in rear travel, can be a 25% or 30% o another cypher in the stroke shock depending on the LR.

This is very important when you have designed a suspension which works well in a short range around the SAG. Coming back to the examples, think about one suspension system designed to have a good anti-squat with 25% of the rear travel. It´s possible that the final user will set a 25%sag on the shock, with the marks and o-ring on it. It could be a different %sag on the rear axle and the suspension doesn´t work well at this point.

Would it be as easy as notice it in the user's manual? Something like "for a right performance of the suspension set a XX%sag of the shock stroke...". And the "XX" would be equivalent to 25% rear travel.

Which is the right way to consider this fact?

Thanks

Hi Donato,
good question - and thanks for calling the software magnific!

Yes in Linkage sag is measured at rear wheel vertical travel now.
It's kind of a heritage, fixing the shock stroke and so calculating max travel is a later development, first there was setting max travel only in Linkage.
I had some conversations with some engineers and there was no common opinion on where to measure sag - shock or wheel...
I believe it only makes a few mm's of difference, you're right it's more important with short travel bikes.

So, I agree now that it seems more proper to measure sag at the shock stroke. Or maybe show both.
You can expect that it will be changed in the software.

Thank you Geri for the answer

Hi, Everyone...!!
Newbie here and just joined. Nice to meet you all.