The Street > The Bike Shop
New odyssey stampy video
DontcallmeKenneth:
The sd ones are shadow inceptiv forks.
Anon.:
They said period.
streetStreet:
--- Quote from: MSBNL on December 12, 2014, 08:14:43 AM ---
--- Quote from: torontoflatlander on December 11, 2014, 10:20:39 PM ---
--- Quote from: MSBNL on December 11, 2014, 08:28:42 PM ---If I remember correctly G mentioned previously that they only tested one pair of forks per competing brand. If this is the case again then it is a bit weird, statistically, to round up all forks for which n=1 to within 0.1 K, and for the one brand for which n≥1 (I assume more than one Odyssey fork was tested) to round up to 650 K+. It's not wrong perse it's just a bit of a weird way to represent your data in my opinion. What is the number of replicates, average number of cycles and standard deviation for Odyssey forks?
--- End quote ---
It's only BMX.
--- End quote ---
I'm not the one who made the barplot, just playing devils advocate. For what it's worth I'd never venture elsewhere when it comes to forks, owned 7 Odyssey forks and the fork that came on my complete bike in 11 years of riding. I actually think the stampy test is really cool and testing your product beyond industry standard is the way to go. I just think the barplot is a bit misleading and if I remember correctly G actually mentioned pretty much the same thing previously but called it not being able to publish data of competitors forks due to only one fork per competing brand being tested. So now that they did a second stampy test I'm curious to find out more about the data on Odyssey forks: How many were tested? What was the average number of cycles until failure? Where the results reproducible?
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we'd know but odyssey's forks are still on the machinhe.
G:
--- Quote from: Finn the Human on December 11, 2014, 02:41:50 PM ---
G, how much input did you have in the stampy test and the ody forks design?
--- End quote ---
Lots.
--- Quote from: MEAT on December 11, 2014, 03:47:39 PM ---Rad. Just to put it all into context, what sort of real world impact would cause that amount of deflection we're seeing? Ie 70kg rider from 4ft, etc, etc....
Is the test applying a predetermined load, or is it deflecting the forks a set amount?
--- End quote ---
It is applying a set load. 5000N for the first half million cycles. All our competitors failed well within this first section, but ours were still going strong so we ramped up the load to 6000N in order to actually break them, and even then it took a further 150k cycles...
It is impossible to draw an exact analogy here with riding. You can ride off a curb with your arms and legs locked and put a huge load on, or you could ride off a 6 foot loading dock and land super smooth. I am working on some strain measurement stuff at the moment to try to get some "examples" of loads applied, but it can never be definitive. I would guess that this (5000N) is about the load that most people apply (momentarily) on their bigger tricks (jumping down a 7-8 stair set perhaps); but this is very much a guess right now.
--- Quote from: mrjimyjohn on December 11, 2014, 04:39:35 PM ---
It looks like this test was the same as the original, cycles of 5000N (at 01:08)
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Previous test was 4000N, which was the maximum we could so with a single cylinder. New rig lets us use two.
--- Quote from: MSBNL on December 11, 2014, 08:28:42 PM ---If I remember correctly G mentioned previously that they only tested one pair of forks per competing brand. If this is the case again then it is a bit weird, statistically, to round up all forks for which n=1 to within 0.1 K, and for the one brand for which n≥1 (I assume more than one Odyssey fork was tested) to round up to 650 K+. It's not wrong perse it's just a bit of a weird way to represent your data in my opinion. What is the number of replicates, average number of cycles and standard deviation for Odyssey forks?
--- End quote ---
I agree to some extent.
I wanted to present the data slightly differently, but it needed to be a nice clear easy to read visual.
Our fork did 500k cycles at the same load as the other forks (5kN) and just under 150k cycles at a much higher load (6kN). Rather than make this too complex, I think it was fair for us to say that at the same load throughout (5kN) we would easily have surpassed 650k cycles. This is what the bar graph is meant to represent.
Yes we only test one fork from each of our most popular competitors. This is because we have a limited budget, and we purchase each fork in the US and then ship to Taiwan, so we are giving some money to our competitors and spending a lot on shipping and testing.
I hope this all makes sense and seems reasonable, and I am pleased that so many people find this interesting.
:)
G.
skateparkrider:
I was stoked to see another Stampy test. But was bummed it was another fork test. I was hoping for something else, but I understand the reasoning for the second go at forks.
Also..... this could be a little bit of the Coors Lite talking here..... but C'MON!!! Don't you feel responsible in the slightest bit to let people know what BMX products are designed in an inferior/dangerous way???? I know that sometimes you can stir up the shit pot too much to the point where you might fall in and then be covered in shit..... So I do get it on one hand. But on the other... at least you can get out of the shit pot, take a shower and not smell like shit after a few days. Everybody else would be forever smelling of the stench that is doo doo.
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