I don't know about that.
The reason guys are 400/800 or 800/1500 depends a lot on their muscle fiber makeup and background growing up.
Contradictory statement... 800 specalists and 400/800 runners are explicitly different things
And I had said that 400/800 runners are often 800m specialists, which perfectly describes Rudisha.
Rudisha's 400 would probably be a half second or more faster if he were to race an open quarter during the height of competition season. Plenty of 800 guys put up seemingly weak early season marks in the 2, 4, 6, 15, 3k, etc (a la Rudisha's 45.5, the 8:20 3ks that you'll see from 8/15 dudes on a regular basis, etc).
To put it another way, lacking new evidence such as him actually running a 15, I classify Rudisha as a 800-runner through and through. I don't think his 400 time is good enough relative to his 800m time to justify calling him a 400/800guy.
You can play with times here at http://timescalculator.appspot.com
... Rudisha would struggle at 1500m.
If they never tried, then it is not proof.
Lagat, Bekele & Aouita prove range from 800 up to marathon at elite levels is only reflected at middle and distance, not down to 400 or lower.
Uh, no. Coe was always an 800/1500 runner who developed amazing 400 speed. This is perhaps the most overlooked achievement of his training.
Sebastian Coe was a 400m runner that moved to the 800 and then become one of the greatest 800/1500 runners ever.
Quick note, I'd have to argue that Murphy is NOT a 400/800 guy considering he won the 1500m at NCAAs.
The 400/800 guy would likely do less mileage, but even this isn't always true considering Murphy does roughly 50-60mpw,
Coe was a longer distance runner as a kid. Easy to find that info.
About 25 years ago I recall my coach saying that Coe said that he was a jacked up 400 runner.
Maybe he said it in his book, or his father's book.
That's where I got the idea that he was a 400 runner that moved up.
But I still stand by me saying that I was a 400/800 runner that became an 800/1500 runner.
Runners tend to move up in distance until they find their best event.
If your best event turns out to be the 800, you likely won't make serious 1500 attempts. That's the 400/800 type.
Some good 800 runners are nearly as good or even better at the 1500.
Nick Symmonds is an interesting case.
At 3:34, he put up a good 1500m time.
But he only ran the 800 at championship events.
I'd say he's a 800/1500 type that would be an 800 specialist, an exception to my rule.
I'm making the assumption that we are putting all 800m runners in either one bucket or the other.