Carbon 26 Wheels MTB 8 Spoke who know them?

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[novocaine]

The wheels would be stiffer and stronger with the opposing spokes pulling at the rim in the same place - like the classic rev-x
View attachment 971399
They must have known this - it doesn't take an engineer to work it out - so i suspect they were using standard (multispoke) rims or manufacturing processes forcing the webs to be offset.

I've been thinking about this for a while. I'm not sure you are right.
two different styles of wheel, one is torsional (the 8 spoker) the other is compression (spinergy)
.
The spinergy wheels work by resisting the bending force laterally due to brute force rigidity of carbon and the triangle formed by the spares, in terms of vertical compliance they aren't as good a spoked wheel as the require very stiff carbon buckle. they are known for self destruction on the roads because they really not designed for rough surfaces (awesome on the track though).

the 8 spoke shown is different, it's using the carbon more like a spoke, placing it under high tension, it resists lateral stress by not allowing more tension in the spoke. vertical compliance is different too, unlike the spinergy which relies on buckling of a carbon spare, this wheel has movement built in to the spoke (tension drops a little) and the spoke on the otherside resists it by not allowing more tension. it means you can have much thinner elements and the wheel is still as stiff. it's a bit like saying the spinergy is a cart wheel with solid wood spoke and the other one is closer to what we know as a spoked wheel.

I've tried to model it but my FEA is struggling with the geometry, if I get it to work I'll show you what I mean.

 

[bikeworkshop]

I've been thinking about this for a while. I'm not sure you are right.
two different styles of wheel, one is torsional (the 8 spoker) the other is compression (spinergy)
.
The spinergy wheels work by resisting the bending force laterally due to brute force rigidity of carbon and the triangle formed by the spares, in terms of vertical compliance they aren't as good a spoked wheel as the require very stiff carbon buckle. they are known for self destruction on the roads because they really not designed for rough surfaces (awesome on the track though).

the 8 spoke shown is different, it's using the carbon more like a spoke, placing it under high tension, it resists lateral stress by not allowing more tension in the spoke. vertical compliance is different too, unlike the spinergy which relies on buckling of a carbon spare, this wheel has movement built in to the spoke (tension drops a little) and the spoke on the otherside resists it by not allowing more tension. it means you can have much thinner elements and the wheel is still as stiff. it's a bit like saying the spinergy is a cart wheel with solid wood spoke and the other one is closer to what we know as a spoked wheel.

I've tried to model it but my FEA is struggling with the geometry, if I get it to work I'll show you what I mean.

I see your point, and believe you could design a rim to carry this loading, although even the campagnolo bora/scirocco
has opposing spokes - and it would be hefty,

but this here rim is clearly made for 32 wire spokes, so will suffer a lot of lateral flex under side loads with only 8 spokes
- the rim will push on the carbon strap
- I doubt it's as stiff under load than under tension.

My usual Occam's razor is... if it worked, we'd be using it already

Bring back solid tyres... any minute now!

 

[novocaine]

I see your point, and believe you could design a rim to carry this loading, although even the campagnolo bora/scirocco
View attachment 972430has opposing spokes - and it would be hefty,

but this here rim is clearly made for 32 wire spokes, so will suffer a lot of lateral flex under side loads with only 8 spokes
- the rim will push on the carbon strap
- I doubt it's as stiff under load than under tension.

My usual Occam's razor is... if it worked, we'd be using it already

Bring back solid tyres... any minute now!

It's a pretty complex geometry is a wheel, there's lots of weird stuff. the Mavic would indeed be better.
Anyways, solid tyres, but 35c.

 

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