800 dude wrote:
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At paces around 7 min/mile they provide about a 20s/mile benefit.
Lol, no. You may feel fast in them, which inspires you to run harder than you would in other shoes, but the actual benefit is a few seconds per mile.
Now, if you are running in non-Vaporfly shoes at a pace that's too fast, then you're likely to blow up and lose a ton of time. If Vaporflys would have made that pace appropriate, then the total effect on your time could be a lot bigger. But that's a different issue.
What are you comparing to? Compared to trainers they are 100% at least 10s/mile faster for the same effort level (at 7 minute miles).
Maybe compared to 150g flats the difference is only 'a few seconds'.
Whether there is a pace that is too slow for them to benefit, I don't know. I've never ran slower than 7:30 in them, but every time I have my perceived effort compared to trainers has been about 10-20s faster than normal.
My point, anyway, was that they aren't fine-tuned to elites' MP. They provide at least a similar percentage benefit at slower paces.