[zod]

From North Shore Billet ( http://www.northshorebillet.com ) a product called the Hanger Banger that "Improves shifting, Protects Derailleur Hanger from bending"

OK, am I missing something here......the whole point of the derailleur hanger is that it bends before the frame does, that is why hangers are made of a maliable compound. Why would I not want my hanger to bend, sounds like a bad idea to me?? Please someone enlighten me......

 

[Kornphlake]

this device, from the looks of it, gives the derailur a second attatchment point at the end of the drailur opposite the dropout. Nail a board to a picknic bench and you'll have lots of deflection at the end, move a second picknic bench under the free end and nail it down and you'll drastically reduce the deflection. In this case the second picnic bench is actually the hub axle which is bolted to the dropout. I guess the thought is that the dropout is burly enough to take the extra load off of the derailur hanger in the case of a crash or whatever because it's built burly enough to handle a wheel pounding on it. I do see where you might notice a flaw in the concept though because the dropout was designed to take loads in the direction a wheel would typically induce into the frame, if you were to smack the derailur just right I can see how the hanger banger would put the bending moment right into the dropout.

 

[zane]

Not to mention that if you ripped a dropout off while running that your warranty would probably be voided.....

 

[mack]

looks like a fasion bolt on with that cross. If it really didnt have any draw back they would come on all bikes.

 

[mattv2099]

I think what zod is saying is that with this device you are more likely to break your frame because instead of your hanger failing the whole thing will fail (with enough force).

Yeah, I'd rather break my hanger than have that force transfer to the frame repeatedly, although not breaking the hanger because this crazy gizmo is attached.

 

[zod]

That's exactly what I am saying.........

I don't understand how this accessory is beneficial at all, anybody see it differently??

 

[Kornphlake]

It'd take a lot of structrual analysis to know for sure but I'm guessing that it would take a pretty big hit to bend the dropout with this gizmo bolted on. I think that's the advantage, sure it does put your frame at risk if you hit something really hard, but it will allow the derailur hanger to last several times longer when it's bumped just hard enough to bend the hanger but not hard enough to sustain any damage to the frame. If I was going through a couple hangers a year I might try one out, so far my hanger count is 1 hanger in 2 years so I think I'll pass.

 

[zane]

From a structural analysis standpoint, if you apply a sideways force to the derailler this gizmo takes those forces and directs them into the frame and dropout, instead of the hanger. The hanger is meant to bend in the event of a crash, and with this gizmo the dropout will bend instead.

 

[kidwoo]

From a structural analysis standpoint, if you apply a sideways force to the derailler this gizmo takes those forces and directs them into the frame and dropout, instead of the hanger. The hanger is meant to bend in the event of a crash, and with this gizmo the dropout will bend instead.

I've had two bikes with non replacible hangers, both DH bikes. The only problem I had was stripping the threads....which was fixed with a t-bolt and made for what I consider a better system. I don't think breaking your frame is an issue.

Looks like a cool idea to me. So do the burlier aftermarket hangers on their website.

I know it's only a little bit, but that device also widens your rear end making the likelyhood of you tagging something that much more probable......ahh the irony.

 

[Kornphlake]

From a structural analysis standpoint, if you apply a sideways force to the derailler this gizmo takes those forces and directs them into the frame and dropout, instead of the hanger. The hanger is meant to bend in the event of a crash, and with this gizmo the dropout will bend instead.

Right but how much force will it take to bend the dropout? Is it an amount that could reasonably be applied through the gizmo?

 

[Wingnut]

I think it would be beneficial for those little impacts. The ones that are just enough to bend the hanger. Anything more and you could run the risk of bending the frame, but you'd have to bend the axle too. The forces, I think, would be pretty well spread out between the axle, hanger and frame. If it truely improves shifting though, it could be worth it.

 

[zane]

Right but how much force will it take to bend the dropout? Is it an amount that could reasonably be applied through the gizmo?

I was just thinking about this a little more, and the derailler would snap before the frame did using this gizmo. Now I really don't care to render a derailler into solidworks and find out how much force will break it but it's probably a lot less than what a frame will take. What I'm getting at is this gizmo will remove THE weak link from the system. This will move the breakage to other parts of the system- your derailler or frame.

 

[johnbryanpeters]

I think it's trying to transfer the force to the axle rather than the frame.

J