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Dec 2019
4:29pm, 16 Dec 2019
9,793 posts
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larkim
Thanks for that jono. You can't argue with their dataset, and it does match up with what everyone says about them. Though 5% "faster". 9 minutes on a 3hr marathon? Maybe I'm misreading that bit.
I also wonder if there is some confirmation bias (?) in the participants - those for whom they really, really want that PB and therefore are prepared to spend a reasonable sum on the kit to do it - making those people more likely to be hitting out at a PB in the races they've sampled which exaggerates the impact somewhat?
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Dec 2019
4:42pm, 16 Dec 2019
4,409 posts
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Windsor Wool
interesting stuff.
Has anyone here really gone and knocked 5% off their marathon time simply by switching shoes?
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Dec 2019
4:44pm, 16 Dec 2019
68,247 posts
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Gobi
Judging by my recent 5kms in and out of them I think I like the feel more than I have become rocket fast.
SADLY !!
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Dec 2019
4:53pm, 16 Dec 2019
5,997 posts
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jda
Looking at that analysis, the shoe switchers are only gaining about 2% compared to other shoes (much of the total 5% gain will be incremental improvement). Sounds plausible though I don't believe I gained that much overall from them (if I did, it means I got significantly worse in underlying speed at just the exact time I switched).
World record didn't come down by anything like 2% did it? That would be 2 mins 30 at their speeds.
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Dec 2019
4:56pm, 16 Dec 2019
9,794 posts
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larkim
There is likely to be some "placebo" effect of them for some people. Nothing wrong with that of course - telling yourself you can be fast because of the shoes, and then being fast with the shoes on is one of those correlation / causation things.
Nike must be laughing all the way to the bank though with the positive product impact from this (let's just ignore Mary Cain / NOP for the time being!)
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Dec 2019
9:04pm, 16 Dec 2019
869 posts
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SKR
I've always wondered about this.
When I trained for Chicago, I did all my speedwork and races in that cycle in Adidas Adizero Adios. The numbers already indicated i would most likely run what i did. I picked up the VFs shortly before the race, did 4 miles @ MP in them and raced the marathon in them.
I didn't get the recovery gains from them because i didn't do any of my workouts in them.
However on the day, my feet felt fresh. My stride was definitely bouncier and after that race my feet felt fresh. so i definitely think there is something to it.
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Dec 2019
11:38pm, 16 Dec 2019
28 posts
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fuzzyduck79
I ran 2:40 marathon in April this year in Inov8's and was a bit crippled for a week. Switched to racing in VF in Oct and ran 2:30 in a fresh pair.
I would hazard a guess I was in 2:36ish shape if wearing same shoes as I did in April, so a smidge below 4% time improvement - but that's just a guess, I could be slightly out on the 2:36 estimate.
I do suspect the shoes I used to run everything in were a bit worse than average, they certainly weren't chosen for performance.
I also ran Snowdonia marathon six days after the 2:30 without any issues, pushing fairly hard and getting within 5 mins of the time I thought I might have run that course on fresh legs.
So I'm with all the data on this, and also in agreement that they help you recover very quickly - feels like I've seen so many faster runners doing way more marathons than normal this year. Sure you can get injured whatever you are wearing, but I think marathons now hurt a lot less with magic foam
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Dec 2019
7:02am, 17 Dec 2019
68,249 posts
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Gobi
Fd - I definitely feel better after an effort in these
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Dec 2019
3:49pm, 19 Dec 2019
8,301 posts
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Boab
Fuzzyduck, Inov8 are not known for the lightening fast road marathon racing shoes  Did you run all your PBs in the VFs? Only ask because you 10k and 10 mile PB's correlate quite well with a 2:30 marathon. That half marathon is soft though
Agree with those who think there is less impact damage in the VF. I get much the same from Hokas.
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Dec 2019
4:40pm, 19 Dec 2019
29 posts
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fuzzyduck79
No - Inov8 selected for harder wearing soles as I kill shoes about 3 times faster than average, which gets expensive
You are spot on with observations about PBs, 10k/10M/marathon in VF and the rest in Inov8 so am hopeful to pull my HM time down a fair bit next time out
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