Any ST physics geeks who can help me on this? I have to believe there's a formula for it. I'd like to calculate the impact of the rolling resistance of various tires on overall bike split time. Variables would likely be: weight of triathlete, weight of bike, rolling resistance of tire, expected normalized power, ride distance - with the answer in minutes (time to finish the given distance). I would then plug in varying values for rolling resistance to find out how each tire might be expected to impact my time. Hopefully that makes sense. Or maybe there is already a general unscientific anecdotally understood measure similar to "...Gatorskins will add x minutes to the time of a 70.3 bike split?" Thanks!