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39 votes
3 answers
13k views

Why are emergency inflation cartridges filled with CO2?

Why aren't they filled with ambient air using air compressors? Isn't compressing ambient air cheaper than generating CO2? If it is, then those cartridges would have two benefits: Cheaper to ...
Tooniis's user avatar
  • 577
6 votes
3 answers
2k views

Does a fat tire ride softer than a skinny one at the same pressure?

Fat tires are associated with good bump absorption. Is this due to their fatness, or is it due to the low pressure with which they can be used? If I pump a fatbike tire to 120 psi (yes, that would be ...
BSO rider's user avatar
  • 5,735
2 votes
1 answer
1k views

Is contact patch area governed by A=W/P

contact_patch_area = weight / tire_pressure Is this true? Wikipedia says "mostly". This guy analyzed some automobile tire manufacturer, and although the info was self-conflicting, he concludes ...
Vorac's user avatar
  • 14k
6 votes
5 answers
3k views

Why do skinny tires require less pedal effort?

Everyone knows (citation needed) that (at fixed rim diameter) tyres with smaller section require less effort to move around (at least on a paved road). TL; DR. Why? A bit of context. I always ...
astabada's user avatar
  • 496