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The markings on the tires for the pressures can be essentially ignored. They're a combination of marketing and legal departments coming up with essentially arbitrary numbers. Find a set of pressures that works for you so the tires are properly inflated -- it should prevent pinch flats, but keep rolling resistance low and absorb road hazards and ...


In terms of weight, it makes no difference either way ( according to this scientific paper - However there are other resistances to motion that differ between your bikes, namely rolling resistance and air resistance, that will affect performance


There are a lot of factors that go into your speed and efficiency, and this switch touches several of them: Rider Position: Typically, a bike with touring geometry will have a slightly longer wheelbase, and lower bottom bracket. Along with other geometry tweeks, the result is that on a touring bike you are likely to be in a slightly more upright position, ...


Are you asking about the immediate effects while high or long-term effects? I can't find any unbiased, well-cited sources except for one from the British Journal of Sports Medicine which basically says that doctors should try to keep athletes from using cannabis due to its possible dangers. However, some sources (of unknown quality) claim that it may help ...

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