Interesting discussion generally in relation to Woods but the bit about R Chung (of virtual elevation aero testing fame) in the 2nd post caught my eye.
for a 10k I can run in around 38min… Roughly 4.4m/s
My FTP is 330 and weight 68… roughly 4.9w/kg
I need to run faster
My ftp is around 3.7 which translates for a 45min 10k. My 10k PB is just over 41mins. I should bike faster (or more relevant, just lose a bit of weight)
There is some serious Willy Waving going on that ST thread… lots of quoting 1 mile times when at high school etc… completely irrelevent as they gave no w/kg numbers to compare
Yeah, Dan E put up a 40 year old mile time within the first page.
If I’m reading it correctly you need to look at your max power for 38mins as your FTP is an hour in theory. The quote is for the same duration so if using FTP it should also be an hour’s run.
Maryka has a best 10km over 41 minutes, and a best FTP over 5w/kg so you’re going great on the run faster compared to her! In the lab her running economy is pretty much all with the untrained people, almost regardless of how much running she does!
I think it’s a dubious statement, everyone is pretty much as efficient as anyone else cycling, but running efficiency differs so much between individuals, all it’s saying is that “if you’ve good running economy, it will be roughly the same as your FTP”, but it’s completely useless for people without good running economy - that’s likely the majority of cyclists tbh - it’s possibly part of the reason they become cyclists.
If your running is faster, it certainly does show you should easily be able to improve your cycling, cycling should only be limited by O2, and everyone has much more similar efficiencies when cycling unlike running. So yes, ride some more, faster.
Yes, but the whole premise is a bit loose, If I work on my 10km time I could probably bring it down by a minute relatively easily, while not really improving my FTP… however, when I improved my FTP significantly last year I don’t think that my 10km time reduced. I do believe that an improved FTP is a great platform to improve your 10km time, but it doesn’t come without some focused work… otherwise we would see Chris Froome winning the 10,000m as well
No we wouldn’t, as his running economy is going to be awful.
Running economy is the deciding thing in running, not O2 kinetics, in cycling because there’s almost very little difference in cycling efficiency between the very best and the rest, that’s all that matters. In running though you can have radically different efficiency, however high your VO2max is you will not be able to overcome a low efficiency. But in cycling you cannot have a much higher efficiency than the next, so all that matters is your VO2max.
I love the theory, it’s the practice that I need to work on (also a calibrated power meter…) I find that my muscle power used to be the limiting factor. Now I’ve trained enough that it is more balanced between that and aerobic capacity.
Thought the run speed/bike power comparison was an interesting way of suggesting where strengths lie. My recent numbers kind of confirm that I am a weaker cyclist, which is something I’d expect.
Bike 1 hour = 267W = 3.9 W/kg
Run 10 miles = 63 minutes = 4.2 m/s
Bike 20 minutes 286W = 4.2W/kg
Run 5km = 18m06s = 4.6m/s
Bike 5 minutes = 310W = 4.6W/kg
Run 1 mile = 5m19s = 5.0 m/s
Good numbers.
If you ever wanted ST in a nutshell this is it, someone resurrects a 5 year old thread (which was bad enough the first time round) just to say they’d punch him in the face 
https://forum.slowtwitch.com/forum/Slowtwitch_Forums_C1/Triathlon_Forum_F1/To_the_cyclist_on_Hwy._1_in_Malibu_this_morning…_P5555031-65/
ETA: Can’t get link to work for some reason, but it works if you paste into browser.
Bad URL!!
Yes but I’m not clever enough to do that!
But traffic, but wind, but I rode fast once, but I have a big dick I can swing, but can we just talk about lumpy duct tape…They’re truly a bunch of naval gazing tossers sometimes.
Only sometimes?