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ErikS
Joined: 19 May 2005
Posts: 8337
Location: Slowing boiling over in the steamy south, Global Warming is real10/6/14 4:24 AM |
If only the UCI and ASO would relax the archaic weight limit they impose.
My relatively cheap in comparison Cervélo S2 is only .5 kilos above the imposed limit.
I would love to ride that bike just for comparison purposes.
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dan emery
Joined: 11 Jan 2004
Posts: 6890
Location: Maine10/6/14 5:07 AM |
crash test dummy
>>AX told us it tested the rims with a 120kg rider on Alpine descents to ensure their strength.<<
Now there's a fun job...
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April
Joined: 13 Dec 2003
Posts: 6593
Location: Westchester/NYC10/6/14 1:36 PM |
test dummy
Whatever happened to Wayne Lim? ;-)
When you weight 250lb, every time you jump on a new bike, you're a test dummy!
Every new component too. New stem? Does it creak when out of saddle? New seatpost? Does it feel springy on rough roads? New rim? Watch that pothole!...
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dan emery
Joined: 11 Jan 2004
Posts: 6890
Location: Maine10/6/14 1:45 PM |
Dunno
I don't know what Wayne is up to, but I don't think he ever got anywhere close to 250. Even I at my worst did not approach that.
I can see the ad:
"WANTED: 250 lb cyclist to see if super lightweight carbon wheels will break on 60 mph alpine descents."
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April
Joined: 13 Dec 2003
Posts: 6593
Location: Westchester/NYC10/6/14 2:16 PM |
"at your worst"...
At your height/weight, I suspect you still don't stress equipment as much as a true muscular 250 pounder. You don't look you're build that way.
More over, it's weight plus power output. A lot of us in our "heavier" days aren't as athletic so don't put out the same power while at higher weight...
I used to grab up cheap light weight component, in the believe I'm light and doesn't stress components. But I quickly found out that's not entirely the right way of thinking about it! I maybe light, but combined with speed and my not-so-great yet not too terrible power output, I could actually brake stuff by just using them! Well, at least stuff that were build "not" to last!
It takes an athletic yet heavy rider to really test the durability of light weight equipment. There're those who're just build heavy that they're "testing" equipment every time they go out...
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ErikS
Joined: 19 May 2005
Posts: 8337
Location: Slowing boiling over in the steamy south, Global Warming is real10/6/14 4:20 PM |
These days you can get light and strong. Carbon has been glued up for 25 years now. Folks are pretty good at working with it now. A big change has been the resin and the vacuum to pull out the voids. Carbon fibers have changed in size and layup but the fiber itself is restricted in strength by the molecule shape itself.
I did a paper in chemistry class last year on Fullerenes and learned much of the strength of carbon structures is related to how the molecules are arranged. Carbon used in the common sheets that bikes come from is nowhere near as ordered as Fullerenes but is still very strong. Fullerenes have HUGE potential if we could figure out how to make longer fibers and larger quantities.
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KerryIrons
Joined: 12 Jan 2004
Posts: 3236
Location: Midland, MI10/6/14 7:23 PM |
Technology of the future
quote:
Fullerenes have HUGE potential
Given the number of decades that this has been true, I think I am safe in saying that "Fullerenes are the technology of the future and always will be." When I watch the Star Wars movies I have to ignore my training in thermodynamics. When I listen to predictions about carbon nano stuff I have to ignore my knowledge of engineering.
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Sparky
Joined: 08 Dec 2003
Posts: 19084
Location: PDX10/6/14 7:41 PM |
I remember when such a thread title would have me rushing in with lust. ;)
I did this on a 13KG bike today. ;)
<img src="http://coupekiss.host-ed.me/images/ttf/casdto30miler.png" width=480>
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