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The factors that affect bike efficiency are: Weight Mechanical power train Losses Aerodynamic Drag Rolling resistance For a touring bike, the difference between a folding and regular bike are all lost in the noise. Smaller wheels tend to have higher rolling resistance and the bike might be a bit heavier, but for touring it just doesn't matter that much. ...


3

Bigger tires, bigger chainrings and a smaller cassette all lead to a higher gearing (the crank arm lengths among other things also come into this, but that encapsulates into bike fit). Bigger tires are subject to frame clearance and feeling squirmy possibly. Bigger chain rings require front derailleur compatibility. Smaller cassette also requires ...


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But you don't have the same transmission as the wheels are part of the transmission. Smaller wheels are not as efficient - more rolling resistance. You also need to send more chain which is not as efficient. You don't have the same position and lack multiple positions offered by drop bars. The frame is not as rigid and absorbs pedal energy. In the end ...



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