By Paul Norman
A few years ago, the trend was to run tyres that were 23mm wide or narrower and pump them up to pressures above 100psi. But more recent research has shown that this generates more rolling resistance than wider tyres run at lower pressures – as well as giving a less comfortable ride and less grip.
This is because at higher pressures the tyre skips over road imperfections, bouncing the entire bike and its rider up and down and leading to wasted energy, rather than smoothing out bumps and producing a more linear trajectory.
So now the trend is to run tyres of 25mm or wider at much lower pressures. And increasingly tubeless rims and tyres are being used to allow that pressure to be dropped even further, since there’s no risk of pinch flats.
Read more at http://www.cyclingweekly.co.uk/videos/bike-fit-and-maintenance/tyre-pressure-run#zi2sUJPk9LEpPa4X.99
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