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jzPV RichardCunningham's article
Feb 13, 2018 at 13:20
Feb 13, 2018
Carbon vs Aluminum: Separating Environmental Fact From Fiction in the Frame Materials Debate
@TheRaven: Ah, the old internet classic: "I respect your opinion, BUT mine is so much better so I'm undermining you because I don't have any facts". I suggest you read my comments again and pick up some textbooks about resource strategy. Bye. @Airfreak: You are right. My problem is that it is not clearly marked as an opinion piece and many take it as all there is. He talks about facts but doesn't list them all. That's why I commented in the first place and thought I maybe can adress this issue for some readers. There are some specialists here in Germany who repair carbon products and frames, one is the "Carbon Klinik" where a friend of mine works. Specialized in Germany send their broken frames there. For a minor failure it costs about 200 - 250 €. The bikes go back to the customer of course, but If you find a broken frame on ebay for cheap you can maybe get a nice functional frame out of it... The problem is even then someday it won't serve it's purpose as a bike anymore and will become scrap.
jzPV RichardCunningham's article
Feb 13, 2018 at 12:26
Feb 13, 2018
Carbon vs Aluminum: Separating Environmental Fact From Fiction in the Frame Materials Debate
@TheRaven: Science is not about respecting personal preferences. For you I'm that guy on the internet, but I know my facts very well. I'm currently working on my master thesis on environmental assessments, so you have to try a little harder to convince me with some hard facts ;)
jzPV RichardCunningham's article
Feb 12, 2018 at 16:31
Feb 12, 2018
Carbon vs Aluminum: Separating Environmental Fact From Fiction in the Frame Materials Debate
Oh, and I forgot to mention that oil production will worsen with the increasing and inevitable scarcity of crude oil, because unconventional deposits will be used. The oil sand production in Canada for example uses more energy than it produces... To summarise: I think because of the dependency on the petroleum industry, the energy demand, the lack of useful end-of-life strategies like recycling to equal value carbon products, human toxicity of resins and nano particles and the mostly questionable crash behaviour, carbon in the bicycle industry is unquestionably ecologically inferior. This article makes it sound like 50/50...
jzPV RichardCunningham's article
Feb 12, 2018 at 15:37
Feb 12, 2018
Carbon vs Aluminum: Separating Environmental Fact From Fiction in the Frame Materials Debate
I also hink this article leans more towards carbon fibre from the beginning and therefore shows some selective facts. 1. If something can be recycled fully and a closed resource circle can be done, it is ecologically superior because downcycling will become one of our biggest problems. No need to point on the raw material production. Don't forget impacts from oil production (Deep Water Horizon anyone?), which leads us to: 2. The carbon manufacturing is shown very positive in this article. 1 kg of carbon materials uses 2.4 kg of crude oil equivalent. A bicycle with carbon frame, wheels and bars uses more than 4 kg of carbon fibre which equals to around 10 kg of crude oil equivalent. That equals 116.3 kWh. The basis for carbon fibre is Polyacrylonitrile. This fibre is synthesized from Propene in two steps requiring heating up to 200 °C and after to 300 °C. The following carbonation process requires a temperature of 1400 °C. Production of Polyacrylonitrile and the carbonation are mostly done in different locations (for the BMW i cars for example PAN production at Mitsubishi Rayon in Japan and carbonation at SGL in Washington state). These heating processes require an immense amount of energy which equals for another 277.8 kWh for the bicycle mentioned above. That's 394.1 kWh altogether. Human toxicity is also not fully understood (not like claimed in this article). I wouldn't want to work in a factory where carbon cloth is cut or any form of carbon dust is around... 3. I seriously doubt carbon frames outlast Aluminium ones (on a side note: Alumin i um). One riding buddy of mine has two carbon bicycles, a Specialized Diverge and an Evil Insurgent. The diverge got a little stick in it's drivetrain and the derailleur got ripped off and it damaged the chainstay. That was fixed, but an Aluminium bike never would have this problem. He crashed the Insurgent right with the headtube into a tree and the frame had to be replaced, so that's waste. A similar crash with my alloy Yeti resulted in nothing than a tree with the mark of a Yeti headtube badge. Sincerely, an Environmental Science/Resource Strategy student.
jzPV RichardCunningham's article
Feb 8, 2018 at 13:26
Feb 8, 2018
Opinion: Does Downhill Have Nowhere Else to Go?
Yes the style was a major influence. But people did tricks on skis 80 years before the snowboard even was conceived. It did look more like gymnastics though...
jzPV pinkbikeaudience's article
Feb 8, 2018 at 12:19
Feb 8, 2018
Round 4: 2017 Photo of the Year - Voting Now Closed
I guess people on their mobile have a hard time finding the rider...
jzPV pinkbikeaudience's article
Feb 7, 2018 at 13:03
Feb 7, 2018
YT Teases New Capra - Video
If it really was milk... why is he shaking it?
jzPV mattwragg's article
Feb 4, 2018 at 10:11
Feb 4, 2018
Behind the Bike: The Merida One-Sixty
Here you can see what Yeti is looking for in a design engineer: https://lukescircle.com/wp-content/uploads/2018/01/Yeti-Design-Engineer.pdf
jzPV mattwragg's article
Feb 3, 2018 at 8:55
Feb 3, 2018
Behind the Bike: The Merida One-Sixty
@MisterChow: I thought it was 51... good to know.
jzPV mattwragg's article
Feb 3, 2018 at 8:12
Feb 3, 2018
Behind the Bike: The Merida One-Sixty
One should mention that Merida owns the majority share of Specialized... that's probably why they won't sell in the US
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