Reply #8: Biking shorts are only 13% Spandex

[wtmusic]

so we're talking about maybe 10 grams of material in a pair of shorts that will last me a year of hard riding.

And your comparison to driving highlights the error in proportion here. I have two carbon bikes I've been riding for years with nary a crack, and both frames together weigh less than 5 lbs.

Each gallon of gas burned in driving dumps 19 lbs. of CO2 into the atmosphere.