I’m running the Portland Marathon in a few weeks. I’ve been running 50-70 miles a week. In July and August, I did two half irons, with run splits of 1:34 and 1:32. I’ve seen running calculators on-line for predicting marathon times, but they all use stand alone run times. So, slowtwich gurus, is there a rule of thumb to predict marathon performance based on half iron run splits? One friend of mine told me his half iron runs were generally :15 slower per mile than stand alone marathon race pace. Does that sound right? What’s been your experience?
Not enough info. Is this your first marathon? Your quads will be humbled in your first (or 8th really). But, if you are relatively young (say, under 35) and have a 1:34 and 1:32 1/2 IM splits (good runs) AND are running 50-70 miles/week (a lot) I’d “speculate” you should easily Boston Qualify (3:10-3:15; I’m guessing your age and that you are male with those times) and could be down around the magic 3 hour mark if an easy course, nice weather and properly tapered.
Good luck!
Good guess on the BQ; that is my goal. It will be my third marathon (first one two years ago, very hilly course in 3:30 and the second marathon was in an ironman last year). Trying to break 3:10:59.
How have your half iron run splits compared to stand alone marathon times?
FWIW, I’ve run around 1:50 in two HIMs, and my marathon PR is a 3:37, set the same year as one of the HIMs. The HIMs were on a hillier course than any marathon I’ve run, and it was much hotter during both HIMs. I think that the HIMs were closer to my best performance than the marathon, as I was a little sick when I ran the marathon. So, I can confidently predict, based upon this sample of one, that you may break 3:00 in your marathon.
Perhaps. In the two HIM’s I did in 2006 (CA 70.3 and Vineman 70.3), I ran 1:36 and 1:30, respectively. I then ran PR 2:56 at the 2006 CIM in December on less mileage than you’re running (I would have liked to have run more miles, but circumstances didn’t allow it - see signature line.)
So, the calculator sounds like it could be right, but there are so many variables involved, who really knows.
I’m with Mike, I run a 1:29 Half IM split and my PR for an open Marathon is 2:59.
Pretty much, assuming “similar” training loads. That’s been my experience, anyway.
I haven’t had a good 1/2 mary run in a while. Only did 1 this year (1:35 at Rockman this year - a moderately hilly run) after a terrible bike. Did Boston this year in inclement weather in 3:14 and 3:07 last fall at an easy course. PR is 2:49, but I was younger 