Cheri - I'm 72kg/1.78m FWIW. What changes with different tires to my understanding is the rolling resistance - that's a property of the tire and inherent. Weight is a whole other factor in the speed/power equation.
For 95% of my riding I now use specialized armadillo's....they are not light or plush, but very, very durable and less prone to flats. If I had an event next week though, I'd switch to the michelins and do some riding on them in advance.....this way you get familiar with the tire's performance, while getting a boost to your own thanks to the lower rolling resistance.
LOL - if you can do a flat on a car, you can do anything on a bike, I'm sure of it!





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