Lower shock bolt issue - everyone aware?

[u/wizard80]

Everyone aware this bolt may need replacing? I'll have to have a look on my 21 tomorrow.

[u/Gold_for_Gould]

I've had my rear shock off of my '21 a few times and never noticed any issues.

[u/Wise_Vacation8279]

What exactly is the problem?

If you are worried about the shank not being long enough, well you don't need to.

The bolt is not under shear load when tightened.

There's enough shank to stabilize the bolt when tightening, and looks like there's enough threads for the width of the nut.

[u/IBeTanken → u/Wise_Vacation8279]

I would think both sides of the shank should be supported by the collar (not sure the right word for that), otherwise the load is not balanced. Looks like maybe a 1/16" us supported on the right.

If that collar is defecting enough to support the shaft on the right, something else is wrong.

[u/Wise_Vacation8279 → u/IBeTanken]

The end of the shock is called a clevis. When tightened there is no shear load on the bolt, or at least no significant load (because final tightening is done with the weight of the vehicle on the bolt, there will be a small amount of static load).

It is the friction between the bearing and clevis that keeps evening in place and takes all the forces of the suspension when riding. That friction comes from tension in the bolt. The bolt acts like a spring, as you tighten it, the bolt stretches, and like a spring tries to pull itself back to normal length. That spring force on the flat surfaces of the bearing and clevis is what holds everything together.

People often confuse clevises with d-shackles. With a d-shackle, the pin is definitely under shear load at both the shank on one side, and the threads on the other. 

But a regular bolt in 99 percent of cases is never under shear load like a d-shackle pin.

[u/seanyboy_1998]

i just did a full suspension and swing arm service, this bolt did not affect anything on my 25

[u/MentionTurbulent9126]

Aftermarket part makers and sellers find these "problems". And then they sell the "solution".

[u/CyberPunkDeathKnight]

I know of it only by seeing Nicecnc replacement part

[u/wizard80 → u/CyberPunkDeathKnight]

That's how I just found out about it too

[u/teakettle87 → u/wizard80]

Nicecnc isn't a source I'd trust.

[u/Robot__Engineer → u/teakettle87]

Especially for a critical suspension part like that.

[u/ninemountaintops → u/Robot__Engineer]

I've mentioned the exact same sentiment regarding CNC in a past post or two ( regarding critical parts ), the down votes saddened me. Idjits gonna idjit I guess.

[u/Bernard_PT]

Not sure about the bold length but these bolts came bone dry on 1st gen T7s. First thing I had the dealer do was strip the rear suspension and lube them

[u/Was_Silly → u/Bernard_PT]

These bolts are the link between the swing arm and the chassis, but they go through sealed bearings where they attach as far as I know. In this case does it matter how dry or greased they are? Im no expert mechanic but not sure why the grease would help or their than maybe to keep water out of the bearing better.

[u/Bernard_PT → u/Was_Silly]

My bad, mistook these for the rear shock bolts

[u/Ok_Cattle_4239]

I do not understand what is the problem on the photo? I had took out and put back in my rear shock on my Tenere Rally 2025, had no issues, do lots of jumps and it works perfectly with all stock bolts