If a running shoe made you 25 percent faster, would it be fair to wear it in a race? What about 10 percent? Or 2 percent? Nike Shoes Outlet Clearance Australia — a bouncy, expensive shoe released to the public one year ago — raises these questions like no shoe in recent distance running history.

Cheap Nike Air Vapormax Flyknit says the shoes are about 4 percent better than some of its best racing shoes, as measured by how much energy runners spend when running in them. That is an astonishing claim, an efficiency improvement worth almost six minutes to a three-hour marathoner, or about eight minutes to a four-hour marathoner.

And it may be an accurate one, according to a new analysis by The New York Times of race data from about 500,000 marathon and half marathon running times since 2014.
Using public race reports and shoe records from Strava, a fitness app that calls itself the social network for athletes, The Times found that runners in Nike Air Max 97 Silver Bullet For Sale ran 3 to 4 percent faster than similar runners wearing other shoes, and more than 1 percent faster than the next-fastest racing shoe.

We found that the difference was not explained by faster runners choosing to wear the shoes, by runners choosing to wear them in easier races or by runners switching to Nike Air Max 90 Mens Australia after running more training miles. Instead, the analysis suggests that, in a race between two marathoners of the same ability, a runner wearing Vaporflys would have a real advantage over a competitor not wearing them.