AXIS hollow spoke technology?

[Onnipotente]

I'm thinking about purchasing the AXIS Reverb rims but was wondering if I should stay away from them because of their hollow spokes. Do you think they would break, bend, or crack easily because of this?

 

[definitiveno]

I don't know about that one. If i had to guess it should be fine....


Ive never personally seen cracked spokes before (outside of an auto accident) ussually just the outside rims get bent

 

[Defiant]

They'd be stronger than solid, if the metal's up to it. I hope there's drain holes on the outer ends.

 

[Omega]

They'd be stronger than solid, if the metal's up to it. I hope there's drain holes on the outer ends.

I would be surprised if there were drain holes.. check out the blue plug.

 

[zephyr_8]

Actually hollow tubes are stronger than solid metal tubes(as defiant said) its because they have more surface area to spread out the load. In a hollow tube there is twice (well almost twice, but you get the idea) the area to take the load(the inside and the outside of the tube). I don't think the open ends is a good idea, but as long as it had a drain or a way for the moisture/crap to get out of the inside of the wheel i don't see it being a problem.

 

[ryu]

these wheels look hot! i read that the 18's w/ 8.5" were 18.5 pounds. i would go for the black ones. i just might do that next week. i fawked up one of my rims when i got a flat so i think im going to just get new wheels and tires. ive been riding on a donut for three days now!

 

[Jehu]

Actually hollow tubes are stronger than solid metal tubes(as defiant said) its because they have more surface area to spread out the load. In a hollow tube there is twice (well almost twice, but you get the idea) the area to take the load(the inside and the outside of the tube). I don't think the open ends is a good idea, but as long as it had a drain or a way for the moisture/crap to get out of the inside of the wheel i don't see it being a problem.

What? Since when does the surface area of a wheel spoke have anything to do with load capacity? Additionally, I'd like to see the calculations that show a hollow tube to be stronger than a solid cylinder WHEN THEY ARE THE SAME DIAMETER. Hollow tubes are stronger per mass of material, but if you're talking strictly about dimensions, a 2" dia solid cylinder is stronger in every respect compared to a 2" dia hollow tube.

Is it a good way to achieve a stronger, lighter wheel? Sure. Is there ANY point machining away the hub to show that the spokes are hollow? Other than for marketing purposes, NONE.

 

[jtmcinder]

As pointed out above, the idea that a hollow something of X diameter is stronger than a solid something of X diameter is really, really silly. I especially like the idea that metal gets its strength from something like surface tension. (In case you slept through high-school physics, surface tension is a liquid -- e.g., water -- issue.) The key to hollow spokes is that they are stronger than something that weighs the same (but is solid), not that they are stronger than something with the same outside diameter.

Given that the other end of the spoke becomes the inside of the rim, the idea that the other end might be open is equally silly. Exactly how would you keep the air inside the tire if it was hollow all the way? I mean, inner tubes are, like, so 1950s.

- Jtoby

 

[DirtyBirdRacing]

Hi,

A hollow tube is much more efficient then a solid bar BUT ONLY WHEN TORSION IS APPLIED TO THE BAR. This is because the material on the inside of the bar is stressed significantly lower then the material on the outside, so by making the bar hollow they reduce weight, but still have the material where it is needed most, on the outside of the bar where the shear stress is the largest. This is why drive shafts on cars are hollow.

I do not understand from a strength or weight point of view why they are hollow though. The way I see it is that alright you have a load on the spoke and the material it is made from has a maximum stress it can take before failure, but since the formula for stress is load divided by cross sectional surface area, the cross section must be the same, so why don’t they make a wheel with a smaller spoke and the same cross sectional area? I can see that you would do hollow spokes if you wanted a wheel with a wide spoke because then you would have the necessary cross sectional area with no extra weight.

I think that they should start making wheels where the inside of the spoke is pressurized because then they will be able to start making wheels very light because the wall on the hollow spokes can be thinner since a hollow pressurized tube is much stronger then that a hollow tube of the same dimensions

Bill

 

[jtmcinder]

Yes, fine, when a wheel is just sitting there holding the car off the ground, the spokes doing most of the work are in compression or tension. But in order to accelerate the car in any direction (including sideways, as in turning), the spokes must deal with torsional forces.

And when do spokes bend or break? When the car is just sitting there or when it is turning?

- Jtoby