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Finn Mansfield from The MI Racing Academy does an experiment to see whether tyre pressure makes a difference to rolling resistance.
Finn's Blog: http://finnmansfieldyouthcyclist.blogspot.co.uk/
MI Racing Academy Webpage: http://themiracingacademy.co.uk/
MI Racing Academy Facebook: https://www.facebook.com/themiracingacademy/
MI Racing Academy Twitter: https://twitter.com/MIRacingAcademy