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Help Iplay Design Carbon Fat Bike Rims...
Chadding:
Funny this topic came up.. I was just thinking about how I so badly wanted some mag wheels when I was a kid. I remember them being popular, but now they are basically extinct. You would think carbon fiber manufacturing could change that, no? I guess there's just no way around 26 spokes being lighter than three big composite spokes? What about two composite spokes though.. wonder if carbon is capable of that?
Either way mag wheels just look cool, and I would love to see some type of improved variation of the design.
Inertia:
Very interesting comments,
consider: what would the front spokes weigh?
V.S.
the carbon mat'l as used in a semi-flat hollowed disk?
considering:
strength factor of one concept as opposed to the other?
Since I haven't used any carbon related stuff like most of you all.
I wonder if you would update me as to real time failure issues?
What is your opinion ref. does/did a rim failure occur because of spoke lace'ng pattern?
Or was the inherent strength of the rim cross section in question?
I ask this because: the few demonstrations of a comparison... aluminum V.S. carbon
only shows a dynamic downward force ( physical push). Note I believe when a wheel is in motion
the real time forces (especially on the front wheel [likely too: applicable to rear wheel set]
has force factors applied from a variety of input angles ...since you are the riders freeze the image in your mind
as to just what is going on at the point of contact upon that very small contact patch collectively?
How about the use of a GOPRO device mounted in such a way to look at in real time the specific area in question?
Then if possible review the digital video in slow to super slow motion whereby 'POSSIBLE' rim distortion- twisting
etc. might be seen? From such a review there may be established the necessities of design modifications. Even adding a
view of the hub area: is there lateral deflection under load occurring? If so can the spoke act within its capability as a spoke?
What is its purpose as well as what are the limits? especially when/while angular forces are at work especially when a riders weight
is /could be 100% forward or reward fro the matter?
Tires/inflation as well may be considered too.
Once a review of these factors is undertaken the collective notion of current rim-cross sections may be scraped altogether.
Well I'm gonna buz on to worship...
Good luck!
? 8) ?
ovr-n-out
Chadding:
Interesting post, Inertia. Not sure how much I can add to the conversation but I looked it up and 28 DT Swiss Champion spokes (which are commonly used) would weigh 192.5 grams, or 0.42 pounds.
As for carbon failure rates.. Pretty difficult to say really. I will say that most of the carbon failures seem to be smaller pieces like the bars attached to many carbon saddles. Not sure it works well for the smaller bits like that. That said, I am no expert and have seen no definitive proof either way.
Oolak:
Interesting thread. As I was reading through it, I remembered this video that shows some mag wheels kinda like what you guys are talking about, and thought it was worth sharing. They aren't MTB wheels but still pretty darn cool looking. I too would like to see some new type of mag wheels come out if they could offer decent performance/weight.
PeterQ:
Here are some videos referring to our 80mm fat bike rims testing:
https://www.youtube.com/watch?v=qsHlC9hHb5A&feature=youtu.be
https://www.youtube.com/watch?v=Tspu2J5Fxbg&feature=youtu.be
https://www.youtube.com/watch?v=qq1GfHrTuw4&feature=youtu.be
We make each kind of production with testing, frame, rims, forks and other items. Now we are arranging 80mm fat bike rims batch production
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