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2
votes
2answers
108 views

Presta vs schrader valves [duplicate]

Are there any advantages of presta inner tube valves over schrader inner tube valves (or vice versa)? Presta schrader I've always wondered why 2 exist. Apart from their radically different ...
9
votes
5answers
1k views

What is the carbon footprint of a new bike?

When you look at the complete journey from bauxite to bicycle via China, a big container ship and the bicycle showroom, there probably is quite a lot of CO2 emissions involved in making a new bicycle. ...
1
vote
5answers
161 views

How is infrastructure for bicyclists designed, and how does it evolve?

Question: How is infrastructure for bicyclists designed, and how does it evolve? Related questions to prompt more detailed answers: When is the right time to build bicycle roads? How is the budget ...