Why the "O" ring on left stanchion only, Marzocchi Bomber Z2

To measure sag or travel used. Slide it to the bottom and measure how much it gets pushed up.

It keeps the blinker fluid in, don’t mess with it.

Not just the sag. The compression damping setting also.

eb1888 said:

Not just the sag. The compression damping setting also.

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? Extrapolated from amount of travel used?

No one answered the question......(I'd expect everyone knows what an O-ring on a Fork is for).

I'd hazard a guess that the O-ring is on the left side to coincide with air cartridge side (most cases) .
Also maybe because most people are right-handed (I'm not) it allows for easier adjustment during riding?

It’s because of the cordials effect. Same as why toilets flush different directions depending on hemisphere. the oring damping equalizes rotational inertia so the turn initiation pressure is same left and right.

Note in Southern Hemisphere the oring should be swapped to the right stanchion, and near the equator you should run them on both sides.

ps: in real life the corralis effect is too weak to control toilet flush direction, toilet flush direction is actually caused by plumbing sidedness cast into toilet.

OldMike said:

No one answered the question......(I'd expect everyone knows what an O-ring on a Fork is for).

I'd hazard a guess that the O-ring is on the left side to coincide with air cartridge side (most cases) .
Also maybe because most people are right-handed (I'm not) it allows for easier adjustment during riding?

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Soooo...no one knows.

Weight conservation, you wouldn't want 2 of those on the bike, slows you down.

Nobody really knows. However, if you slide it down all the way to the seal, it will come up some when you mount your bike.

Some say its to measure travel used when riding. But it never worked for me. When I finish a ride and look at the o-ring, it never tells me how much I've traveled on that ride. I know I rode 9 miles, but the o-ring only moved up 3". Am I supposed to do some fancy maths to figure out how much I traveled? 3x3=9?

It's to stop air leaking out the top of the left stanchion. Don't move it or air will start pissing out and you will need to buy a new fork. They should put a warning sticker on the fork to tell you this imo...

the-one1 said:

Some say its to measure travel used when riding. But it never worked for me. When I finish a ride and look at the o-ring, it never tells me how much I've traveled on that ride. I know I rode 9 miles, but the o-ring only moved up 3". Am I supposed to do some fancy maths to figure out how much I traveled? 3x3=9?

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Were you traveling when performing the test or just riding local trails? Could make a difference. More testing needed.

noapathy said:

Were you traveling when performing the test or just riding local trails? Could make a difference. More testing needed.

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I'll be traveling this weekend with my bike. I'll report back what the o-ring tells me.

Oh dear. That's supposed to be on the INSIDE of the fork. Looks like another one got past the QA robot. Whoopsy.

If you're getting more travel on one side of your fork than the other, see your doctor, er…bike mechanic.

Back up co*k ring. I have ten on my fork.

They are preparing for the magnetic pole swap....

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Ignore the jokers, its for strapping tubes and multi-tools etc to your bike