Standard Shock/Spring Performance and Measurement
Posted: Tue Jun 29, 2021 12:04 am
Hey all!
In the hopes that I'll be able to ride 2-up soon-ish, I have been wondering the best method (is there a standardized one?) for "measuring" the performance of your shocks/springs. How much "Sag" is to spec, how do you measure it, etc.
My brother helped me in measuring the sag, and as best I can tell, the numbers (for the back spring) are a bit high (in terms of how *much* sag is expected, compared to bike alone on its wheels, no center stand).
Those numbers look like this:
Myself alone: 1 1/8" sag
Myself plus 2-up partner: 2 1/8" sag
The reference points used to measure were the lower spring bolt in a straight line perpendicular to the ground up to the frame supported by the shock. It's a Hagon spring, but I can't for the life of me find any numbers or info on the spring. I'm 280lb, and my 2-up is 175lb. I have virtually no info on the weight of the rider for who the spring/rear shock was purchased, but based on this sag info, is it safe to assume that I am heavier than them?
This leads me to my next question: I presume I can keep the existing shock body, but need to replace the spring. If this is true, how do I go about determining what I need, and where do I get it?
In the hopes that I'll be able to ride 2-up soon-ish, I have been wondering the best method (is there a standardized one?) for "measuring" the performance of your shocks/springs. How much "Sag" is to spec, how do you measure it, etc.
My brother helped me in measuring the sag, and as best I can tell, the numbers (for the back spring) are a bit high (in terms of how *much* sag is expected, compared to bike alone on its wheels, no center stand).
Those numbers look like this:
Myself alone: 1 1/8" sag
Myself plus 2-up partner: 2 1/8" sag
The reference points used to measure were the lower spring bolt in a straight line perpendicular to the ground up to the frame supported by the shock. It's a Hagon spring, but I can't for the life of me find any numbers or info on the spring. I'm 280lb, and my 2-up is 175lb. I have virtually no info on the weight of the rider for who the spring/rear shock was purchased, but based on this sag info, is it safe to assume that I am heavier than them?
This leads me to my next question: I presume I can keep the existing shock body, but need to replace the spring. If this is true, how do I go about determining what I need, and where do I get it?