It's telling that the calculated carbon footprint of the bicycle included road and bicycle maintenance costs, rider's diet, and infrastructure capital expenditures. Most automobile carbon calculations I've seen don't go nearly as deep.
For what it's worth, the 240 kg of carbon emitted during the manufacture of a bicycle is also the same amount emitted by burning 100 gallons of gas -- enough to get a sparingly-used Prius from one oil change to the next or a Hummer H2 out of its driveway.
--Ryan S.
There's obviously a lot of variables to have to equalize to get to apples to apples, but this is a decent article comparing the impacts of bikes vs cars, and the number of miles it would take to offset one or the other.
http://www.slate.com/id/2300676/
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