Unchained Bicycles – Pinion / Belt / 7075 Bonded Frame / 170-170mm

joshmtb
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4/17/2025
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Haslemere, GB
11/8/2025 11:49am

It would be interesting to hear about how you did your simulation in the end? I'm looking at creating a frame using a similar construction technique. I'm somewhat stuck on load case definition and torsional stiffness targets!

Lolo.ch
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12/16/2023
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Belmont-sur-Lausanne, CH
11/8/2025 12:55pm

The load cases we used are mainly based on the EFBE Tri-Test (Cat 5).

EFBE is a German company specialized in frame testing.

I can’t share the exact load cases since they’re proprietary, but EFBE can provide the official documentation once you pay an advance or deposit.

You can also find some useful hints in their public test videos on YouTube — they show quite well the kind of loads and setups they use.

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joshmtb
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Haslemere, GB
11/8/2025 1:16pm Edited Date/Time 11/8/2025 1:17pm

So you've designed purely around their load case? There's pinkbike article where Pole may have let a lot of the numbers and info out of the bag....

Was the price to get the test spec from the lab expensive?

Regarding stiffness targets, was that done by benchmarking frames you liked riding?

Primoz
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SI
11/9/2025 1:16am
joshmtb wrote:
So you've designed purely around their load case? There's pinkbike article where Pole may have let a lot of the numbers and info out of the...

So you've designed purely around their load case? There's pinkbike article where Pole may have let a lot of the numbers and info out of the bag....

Was the price to get the test spec from the lab expensive?

Regarding stiffness targets, was that done by benchmarking frames you liked riding?

It's 500 eur to get the spec for one category of use for one component/area of use and the money is a credit for future tests performed by them on an actual component. 

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