King Song S22 Linkage Progression

[redfoxdude]

Hello everyone,

I haven't seen the actual progression curve of the S22's linkage posted, and since my S22 is currently disassembled to install some roller sliders from Hou Ningning, I went ahead and took some measurements. These are the results:

The leverage ratio goes from about 2.4 to 1.4 over the full range. It is indeed progressive as advertised, but I could see an air shock for even more progression being a great idea for jumpers.

(Disclaimer: the measurements are subject to some error. I made a jig that allowed me to move the effective shock stroke in 5mm increments, but that, and my measurements of the wheel travel, are certainly not perfect.)


Stay safe out there,
redfoxdude

KS22_Linkage_Progression.csv

[Tawpie]

Thank you! That's a great chart... very useful. It's not as progressive as one might think (saved by 130 mm of wheel travel and 75 mm of stroke), but it tells me we have a fairly wide range of sag that will work, and trying to finely dial in the spring rate or preload probably isn't necessary.

Edited February 16, 2023 by Tawpie

[EMA]

Nice work !

[redfoxdude]

I was a bit surprised, as I thought it was more progressive as well. I'll throw one ugly wrench into it, with King Song's 8-wheel sliders, it would seem that even in the elevated suspension position (3 holes visible), the suspension can only reach ~108mm of wheel travel/60mm of shock stroke before they collide with frame at the top. (This was my motivation behind selecting Ningning's 6-wheel variant, and I believe this was one of Alexander Vodnev's criticisms of adding so many wheels.)

[EMA]

29 minutes ago, redfoxdude said:

I was a bit surprised, as I thought it was more progressive as well. I'll throw one ugly wrench into it, with King Song's 8-wheel sliders, it would seem that even in the elevated suspension position (3 holes visible), the suspension can only reach ~108mm of wheel travel/60mm of shock stroke before they collide with frame at the top. (This was my motivation behind selecting Ningning's 6-wheel variant, and I believe this was one of Alexander Vodnev's criticisms of adding so many wheels.)

it's pretty clear that KS don't know what to do

anyway with 6 wheels sliders you get 130mm in the upper position ?

[redfoxdude]

On 2/15/2023 at 11:59 PM, EMA said:

it's pretty clear that KS don't know what to do

anyway with 6 wheels sliders you get 130mm in the upper position ?

It's quite sad. 

Indeed, it looks like I should get the full 130mm with the 6-wheel sliders. I think 130mm is achievable, but the fender makes contact with the upper suspension bracket at around 125mm. Probably could squeeze in that extra with a bit of Dremel work.
Hou Ningning's 8-wheel sliders are ~5mm shorter than King Song's, and should get about ~113mm (needs verification) before they collide with the upper frame.

Edited March 1, 2023 by redfoxdude
New info

[MetricUSA]

I just wish anyone to send me roller slides!!! I refuse to assemble the damn thing until I have a set... 

[okvp]

Has anyone tried a quality air shock for ks22?

Travel seems to be quite linear which is a good thing for air shock. Original DNM shock spring is very stiff, I'm 87kg and can get only 13mm of sag (spring adjusted too loose) out of 76mm travel. Air shock spring rate adjustability is unbeatable and modern quality air shocks should be quite durable.  Original shock is also very typical chinese quality, it's copied in a cheap way and missing e.g. one of rebound valve system. https://youtu.be/0xteF26fws0 .