John Rozanski

Born : 1947 Cat. M75 Ultrarunner since 1996

DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.

DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details

Countries visited ?

Canada

United States

88,3%

Rank quotient ?This runner's calculation uses 24 eligible race(s): Σ(rank − 1) = 1 687; Σ finishers = 1 911. 1 687 / 1 911 × 100 = 88.28%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed24

Km — ultra races1 619 km

> 24h1

Longest race98,0 km

19th Cornbelt Running Club 24 Hour Run — 6/5/2000

Km per year (ultra races)

2022

2023

2024

2025

2026

Race types (share of distance)

Road18,8%

Trail81,2%

Records

50 km6h24'08 50 mi11h50'40 12 h58,26 km 24 h97,96 km

HISTORY

24 race(s)

Date		Race	Perf.	Rk
2013
17.08	50mi	Beast of Burden Summer 50 Miler	18:24:46 h	47
06.04	50mi	19th Umstead Endurance Run 50 Miles	16:52:11 h	95
2012
31.03	50mi	18th Umstead Endurance Run 50 Miles	15:34:55 h	91
2011
11.09	9:11h	10th Patriot's Ultra Run	45.061 km	30
02.04	50mi	17th Umstead Endurance Run 50 Miles	14:25:13 h	98
2010
27.03	50mi	16th Umstead Endurance Run 50 Miles	16:24:21 h	109
2009
20.09	50km	6th Rock Cut Hobo 50K	9:22:27 h	80
2007
09.06	12h	2nd Hawthorn Half Day Run	58.258 km	26
2001
07.04	50mi	7th Umstead Endurance Run 50 Miles	14:14:08 h	98
2000
04.11	50km	1st Chicago Lakefront Fall 50km Race	6:24:08 h	128
12.08	8h	10th Howl at the Moon 8h Run	52.464 km	77
06.05	24h	19th Cornbelt Running Club 24 Hour Run	97.960 km	35
08.04	50mi	6th Umstead Endurance Run 50 Miles	12:48:32 h	70
1999
27.06	50km	Rock Island Trail 50km Run	7:16:11 h	58
10.04	50mi	5th Umstead Endurance Run 50 Miles	12:33:37 h	73
1998
29.08	50km	Fairfield Trail Runs - 50 km	7:23:15 h	12
04.04	50mi	4th Umstead Endurance Run 50 Miles	12:43:00 h	49
07.03	50km	18th Carl Touchstone Memorial Mississippi Trail 50 km	7:28:28 h	65
07.02	50km	10th John A. Dick Memorial Crusty 50K	6:45:41 h	30
1997
27.12	50km	1st Huff 50K Trail Run	7:12:28 h	92
05.04	50mi	3rd Umstead Endurance Run 50 Miles	12:52:00 h	56
1996
12.12	50mi	7th Sunmart Texas Trails 50 Mile	11:50:40 h	270
02.11	50km	4th OPSF Ultra 50 km Race	7:07:15 h	12
31.08	50mi	1st Haliburton Forest 50 Mile Race	14:03:00 h	10

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	6/5/2000	19th Cornbelt Running Club 24 Hour Run	97,96	×2
✓ 2	17/8/2013	Beast of Burden Summer 50 Miler	80,47	×2
✓ 3	6/4/2013	19th Umstead Endurance Run 50 Miles	80,47	×2
✓ 4	31/3/2012	18th Umstead Endurance Run 50 Miles	80,47	×2
✓ 5	2/4/2011	17th Umstead Endurance Run 50 Miles	80,47	×2
✓ 6	27/3/2010	16th Umstead Endurance Run 50 Miles	80,47	×2
✓ 7	7/4/2001	7th Umstead Endurance Run 50 Miles	80,47	×2
✓ 8	8/4/2000	6th Umstead Endurance Run 50 Miles	80,47	×2
✓ 9	10/4/1999	5th Umstead Endurance Run 50 Miles	80,47	×2
✓ 10	4/4/1998	4th Umstead Endurance Run 50 Miles	80,47	×2
✓ 11	5/4/1997	3rd Umstead Endurance Run 50 Miles	80,47	×2
✓ 12	12/12/1996	7th Sunmart Texas Trails 50 Mile	80,47	×2
✓ 13	31/8/1996	1st Haliburton Forest 50 Mile Race	80,47	×2
✓ 14	9/6/2007	2nd Hawthorn Half Day Run	58,26	×1
✓ 15	12/8/2000	10th Howl at the Moon 8h Run	52,46	×1
✓ 16	20/9/2009	6th Rock Cut Hobo 50K	50,00	×1
✓ 17	4/11/2000	1st Chicago Lakefront Fall 50km Race	50,00	×1
✓ 18	27/6/1999	Rock Island Trail 50km Run	50,00	×1
✓ 19	29/8/1998	Fairfield Trail Runs - 50 km	50,00	×1
✓ 20	7/3/1998	18th Carl Touchstone Memorial Mississippi Trail 50 km	50,00	×1
✓ 21	7/2/1998	10th John A. Dick Memorial Crusty 50K	50,00	×1
✓ 22	27/12/1997	1st Huff 50K Trail Run	50,00	×1
✓ 23	2/11/1996	4th OPSF Ultra 50 km Race	50,00	×1
✓ 24	11/9/2011	10th Patriot's Ultra Run	45,06	×1