safety wire quiz: what's wrong with this picture?

[brady]

At first it seems like a clean solution to 2nd Gen SV axle wiring, but what's wrong with this pic?

From what I see:

• one kinda wrong thing > not enough tension
• a second wrong
• a third very wrong

[Rada]

I saw this over there....

The pinch bolt should be wired to the far side to put the wire in tension if the bolt tries to loosen. I prefer cross drilled with the wire wrapped around the head.

The wire through the axle is only a single plane shear. It should be set to keep the axle tight be tension on both strands of the wire.

You are right at first glance it looks good. Very similar to the way I do mine. But with subtle differences that make it not so correct.

[Degsy]

Wirelessly posted

You qualify to be a tech inspector at LRRS with those picky comments guys.

Will it stop the pinch bolt coming out? Yes. End of story.

It's not perfect but does the job. The pinch bolt could only turn about 1/4 turn. Not enough to let the axle slide out (IF the safety wire sheared at the axle).

My main gripe is the 1/2" of tail sticking out ready to tear skin.

I have seen far worse.

:-).

[csmutty]

Wirelessly posted

You qualify to be a tech inspector at LRRS with those picky comments guys.

Will it stop the pinch bolt coming out? Yes. End of story.

It's not perfect but does the job. The pinch bolt could only turn about 1/4 turn. Not enough to let the axle slide out (IF the safety wire sheared at the axle).

My main gripe is the 1/2" of tail sticking out ready to tear skin.

I have seen far worse.

:-).

And the wire size is too big. I like the small stuff.

[Degsy]

Wirelessly posted

Wirelessly posted

You qualify to be a tech inspector at LRRS with those picky comments guys.

Will it stop the pinch bolt coming out? Yes. End of story.

It's not perfect but does the job. The pinch bolt could only turn about 1/4 turn. Not enough to let the axle slide out (IF the safety wire sheared at the axle).

My main gripe is the 1/2" of tail sticking out ready to tear skin.

I have seen far worse.

:-).

And the wire size is too big. I like the small stuff.

I'm with stupid on this also. The thick wire kinda sucks.

[Kitt]

I know by this post, it is below freezing outside.

[BackMarker-943]

While it would do the job .... , I would never let that fly on my bike !!!!

I understand why that wire job looks so sh*ty ... Look how dingy / dirty the fork and wheel looks !!!!

[brady]

Wirelessly posted

You qualify to be a tech inspector at LRRS with those picky comments guys.

Will it stop the pinch bolt coming out? Yes. End of story.

It's not perfect but does the job. The pinch bolt could only turn about 1/4 turn. Not enough to let the axle slide out (IF the safety wire sheared at the axle).

My main gripe is the 1/2" of tail sticking out ready to tear skin.

I have seen far worse.

:-).

Fair enough. I guess if the pinch bolt is wired at all it could never let the axle back out enough to shear the wire. Is the axle usually wired just as an anchor for the pinch bolt, or is it required?

I know by this post, it is below freezing outside.

Snowing even, and I've had to eat bright pink strawberry birthday cake 2 days in a row.

[Kurlon]

Fair enough. I guess if the pinch bolt is wired at all it could never let the axle back out enough to shear the wire. Is the axle usually wired just as an anchor for the pinch bolt, or is it required?

Snowing even, and I've had to eat bright pink strawberry birthday cake 2 days in a row.

Axle and retaining nut need to be wired, if the axle threads into the fork lug directly you only need to wire the axle.

[timmyho414]

so would you just line the hole up and not care about torquing the axle or would you torque the axle and drill another hole when it stops lining up?

[OreoGaborio]

Wirelessly posted

You qualify to be a tech inspector at LRRS with those picky comments guys.

Will it stop the pinch bolt coming out? Yes. End of story.

It's not perfect but does the job. The pinch bolt could only turn about 1/4 turn. Not enough to let the axle slide out (IF the safety wire sheared at the axle).

My main gripe is the 1/2" of tail sticking out ready to tear skin.

I have seen far worse.

:-).

And the wire size is too big. I like the small stuff.

I'm w/ stupids

[OreoGaborio]

so would you just line the hole up and not care about torquing the axle or would you torque the axle and drill another hole when it stops lining up?

Torque the axle to spec, THEN drill.
When the holes line up, you know you're torqued.


I know what some of you might be thinking... And yes, over time as the threads wear and the metal fatigues lining up the holes won't bring you quite up to the specified torque... but the biggest reasons for torque specs is so that you don't unnecessarily OVER torque it and so that it doesn't come loose.... well, either are going to happen once you start using the holes for guidance and safety wire for security.

[doug1611]

I didn't like the hole drilled thru the fork

[R7]

Lazy is what I see! Drilling the fork at a critical strength point is not the smartest idea.
Back the axle bolt out a bit and drill the corner of it on an angle...probably bust a couple/few bits but it's the safest and rite way to do it.
Other than that, the wire job still looks like shit. It's lose and not pulling on the pinch bolt in a way to keep it tight

[OreoGaborio]

Would ya really call that a critical strength point?
I'd say it's more of a flex point since that's just where the axle gets pinched. Not really load bearing, is it?

I dunno, I'm no engineer.

[csmutty]

You guys are way overthinking this haha.

[R7]

Would ya really call that a critical strength point?
I'd say it's more of a flex point since that's just where the axle gets pinched. Not really load bearing, is it?

I dunno, I'm no engineer.

Ask an engineer if a "flex" point should be altered in any way.
That was my point, it's in the thinnest part of the fork, and at a point where there is movement at times. Drill a hole in it, you take away material, you take away strength. Over thinking it, probably so..I wouldn't do that to my bike!

[Garandman]

Can someone post a pic of a correct way to do it? I don't need any help doing it wrong....

[csmutty]

Can someone post a pic of a correct way to do it? I don't need any help doing it wrong....

Except they have the wire on the pinch bolt going in the loosening direction, not the tightening direction. Looks like they drilled it through adjacent flats instead of parallel ones.

[Rada]

This was how I was shown to do it.

[Garandman]

Where are the ends twisted in that one?

[soofle616]

Would ya really call that a critical strength point?
I'd say it's more of a flex point since that's just where the axle gets pinched. Not really load bearing, is it?

I dunno, I'm no engineer.

As an engineer I'll throw in my interwebz expert opinion. Yes, it's a flex point. As such, drilling a hole in it creates a stress concentration at the hole. Where previously the stress of bending would be (ideally) spread across the whole area it will now focus more on the edges of the hole because that's where the material is not uniform. Over time this MIGHT result in a crack forming. A crack might form in that area anyway but having a hole there makes a crack more likely and guarantees that any crack that does form will do so starting at the hole. Given how little the metal actually flexes there (talking displacement not repetitions) I personally wouldn't be terribly concerned with it. That said, it looks ugly and hackish to me and even on a race bike I'd be inclined to do a better job.

[csmutty]

Right on top of the pinch bolt.