October 15, 2021 Login  


Carbon footprint of bikes
Last Post 10/11/2021 05:52 PM by 79 pmooney. 2 Replies.
Printer Friendly
Sort:
NextNext
You are not authorized to post a reply.
Author Messages
Orange Crush

Posts:3600

--
10/11/2021 02:34 PM
Good for Trek for doing research on this. https://www.pinkbike.com/news/carbon-frames-produce-more-emissions-than-alloy-and-more-key-points-from-treks-sustainability-report.html
Dale

Posts:1463

--
10/11/2021 03:41 PM
Summoning the "steel-is-real" group.

Wait... is that Grant Peterson I hear?
79pmooney

Posts:2754

--
10/11/2021 05:52 PM
A huge factor is air shipping; something I could have told you almost 50 years ago as a sophomore engineering student. (Naval architecture so a lot of wing and foil theory and calcs.) For fun I calculated the fuel required to fly my 155 pound body 800 miles from Boston to Detroit. (School was in Ann Arbor.) All I needed was distance and altitude. I used the flight efficiency of a sailplane and picked a realistic engine efficiency out of a hat. (I was taking thermodynamics and propulsion at the time.)

I wish I had kept the calcs. I'd do them again but after all this time and my head injury, they're no longer easy and my mistakes wouldn't be obvious to me like they were then. The fuel cost for this scrawny body was huge! Extrapolate to a full plane and you know that those jets are essentially tankers (and no wonder those that hit the WTC did what they did).

By contrast, bicycles, trains and merchant ships are some of the most efficient means of transporting goods ever created. (Bicycles, being rather small, have cargos limited to not much more than one live body.) All three can be as high as 1000 miles to the gallon vs a conventional car. Cars are an order of magnitude better than planes. Re: ships - those that carry heavy cargos and are slow are super efficient. High speed ships far less so. They have to battle a resistance curve (wave making) that makes our bicycle aero challenges look like rolling resistance. Very, very crudely, speed to the third power vs air resistance - speed to the second power vs rolling resistance - speed to the first power.
You are not authorized to post a reply.

Active Forums 4.1
NOT LICENSED FOR PRODUCTION USE
www.activemodules.com

Latest Forum Posts
Carbon footprint of bikes posted in Gear Advice

Tarmac SL7 recall posted in The Coffee Shop

Lombardy posted in Professional Racing


Helmet test info posted in Gear Advice

Clincher vs tubular, Cycling News posted in Gear Advice

Roubaix posted in Professional Racing

No articles match criteria.
  Terms and Conditions | Privacy Policy  Copyright 2008-2013 by VeloNation LLC