The M8 Touring bikes have two shock aborbers, mounted in parallel, but only one of them is adjustable? I am trying to figure out how that can work, ie how can only one of them be adjustable and it still work? Here is a video that shows, shock aborbers, in general, on a robotic device. It serves as an introduction because its simple.

Watch what happens starting at about 1 min and 15 seconds in the video. How come that does not happen to the new Touring bikes that have only 1 adjustable shock?

 

All HD "premium" shocks are that way since the Rushmores. **** adjusts preload. It can't twist like your video because there is no way for the swingarm to twist. It's fixed in the front via the mount, and fixed on the rear via the axle.

 

[QUOTE=chopper_man;18048111]All HD "premium" shocks are that way since the Rushmores. **** adjusts preload. It can't twist like your video because there is no way for the swingarm to twist. It's fixed in the front via the mount, and fixed on the rear via the axle.[/QUOTE]

Yep.

 

I dumped the stock shocks for premium Pro-Action. Even with higher quality shocks you don't set the adjustment the same on both sides. I wish I could better explain it but it works. They each have the ability to handle different conditions/bumps/ rebound, etc and work well together for a greater range of conditions.

 

I bought a pair of new take-off 2017 shocks to try on my 2011 RK because the air shocks were crapola and it made a big difference in how it rode and took bumps - Im very pleased with my $100 purchase. I can't help but think there's something negative about having one heavy coil on one side thats adjustable and a pen spring on the other side. It's gotta torque the arm and cause deflection of some sort, maybe eat swing arm bearings faster? I get having two shocks with different purposes on a single arm but thats on a car application with a hub carrier and an upper arm where the deflection could be more easily controlled. Im sure the single swing arm sport bikes would add an interesting dynamic to the arm and bushings so maybe this odd match on the HD isn't so bad.