Robert Sobsey

Born : 1951 Cat. M75 Ultrarunner since 1983

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 ?

United States

27,9%

Rank quotient ?This runner's calculation uses 70 eligible race(s): Σ(rank − 1) = 4 368; Σ finishers = 15 663. 4 368 / 15 663 × 100 = 27.89%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed71

Km — ultra races5 031 km

> 100 km6

> 160 km3

Longest race160,9 km

19th Western States 100 Mile Endurance Run — 27/6/1992

Km per year (ultra races)

2022

2023

2024

2025

2026

Race types (share of distance)

Road14,5%

Trail83,5%

Stage2,0%

Wins & podiums (ultra)

🏆 Win1

🏆 Win M1

🏅 Top 32

🏅 Top 3 M2

Longest winning streak1

Current streak0

Records

50 km3h52'00 100 km8h28'37 50 mi6h36'40 100 mi23h19'49 6 h49,70 km 12 h107,34 km

HISTORY

70 race(s)

Date		Race	Perf.	Rk
2016
14.05	50km	1st Paiute Meadows Trail Run	8:03:47 h	26
2014
31.12	6h	5th New Years One Day 6 Hour Run	49.704 km	30
2012
10.03	50km	23rd Way Too Cool 50K Endurance Run	6:02:36 h	409
2010
15.05	50km	25th Silver State 50 km	6:49:03 h	42
2008
08.03	50km	19th Way Too Cool 50K Endurance Run	6:24:00 h	309
2007
20.10	12h	2nd San Francisco One Day, 12h	90.123 km	12
14.04	50mi	28th American River 50 Mile Endurance Run	9:57:39 h	244
10.03	50km	18th Way Too Cool 50K Endurance Run	5:56:38 h	243
03.02	50km	29th Jed Smith Ultra Classic - 50 km Race	5:03:11 h	43
2006
28.10	12h	1st San Francisco One Day, 12h	89.962 km	8
15.07	50km	5th Tahoe Rim Trail 50km Endurance Runs	6:44:07 h	27
11.03	50km	17th Way Too Cool 50K Endurance Run	5:34:58 h	131
2005
16.07	50km	4th Tahoe Rim Trail 50km Endurance Runs	7:03:47 h	36
12.03	50km	16th Way Too Cool 50K Endurance Run	6:09:49 h	250
01.01	50km	3rd Angel Island 50k	6:04:28 h	10
2004
13.03	50km	15th Way Too Cool 50K Endurance Run	5:41:19 h	187
2003
05.04	50mi	24th American River 50 Mile Endurance Run	8:39:05 h	96
08.03	50km	14th Way Too Cool 50K Endurance Run	4:51:03 h	90
2002
09.03	50km	13th Way Too Cool 50K Endurance Run	5:42:06 h	214
2001
10.03	50km	12th Way Too Cool 50K Endurance Run	5:38:27 h	181
2000
11.03	50km	11th Way Too Cool 50K Endurance Run	5:06:23 h	80
1999
10.04	50mi	20th American River 50 Mile Endurance Run	8:12:36 h	78
13.03	50km	10th Way Too Cool 50K Endurance Run	5:03:50 h	93
1998
14.03	50km	9th Way Too Cool 50K Endurance Run	4:54:55 h	61
1997
15.03	50km	8th Way Too Cool 50K Endurance Run	4:55:39 h	77
1996
05.05	100km	1st Miwok 100k Trail race	12:02:35 h	23
06.04	50mi	17th American River 50 Mile Endurance Run	8:07:57 h	63
1995
03.09	50km	1st Run On The Sly 50 km	5:19:56 h	10
20.05	50mi	10th Silver State 50 Miles	10:42:02 h	10
13.05	50km	12th Quicksilver 50 km Endurance Run	4:53:13 h	7
01.04	50mi	16th American River 50 Mile Endurance Run	7:49:29 h	64
11.03	50km	6th Way Too Cool 50K Endurance Run	4:48:47 h	42
1994
26.11	28mi	10th Quad Dipsea Trail Run	5:29:35 h	45
21.05	50mi	9th Silver State 50 Miles	10:00:23 h	14
07.05	50km	11th Quicksilver 50 km Endurance Run	5:17:17 h	4
16.04	50mi	3rd Leona Divide 50 Mile Run	9:04:37 h	33
02.04	50mi	15th American River 50 Mile Endurance Run	8:37:22 h	147
12.03	50km	5th Way Too Cool 50K Endurance Run	5:04:15 h	88
05.02	50km	16th Jed Smith Ultra Classic - 50 km Race	4:13:36 h	22
1993
13.03	50km	4th Way Too Cool 50K Endurance Run	5:15:14 h	85
1992
27.06	100mi	19th Western States 100 Mile Endurance Run	23:19:49 h	48
17.05	50km	6th Ohlone 50K Wilderness Run	5:13:30 h	9
16.05	50mi	8th Silver State 50 Miles	8:30:50 h	9
09.05	50km	9th Quicksilver 50 km Endurance Run	4:49:00 h	9
04.04	50mi	13th American River 50 Mile Endurance Run	7:30:49 h	44
14.03	50km	3rd Way Too Cool 50K Endurance Run	4:42:47 h	33
1990
19.05	50mi	7th Silver State 50 Miles	8:23:00 h	4
07.04	50mi	11th American River 50 Mile Endurance Run	7:20:40 h	34
10.03	50km	1st Way Too Cool 50K Endurance Run	4:50:16 h	15
11.02	50mi	12th Jed Smith Ultra Classic - 50 Mile Race	7:01:22 h	15
1989
20.05	50mi	6th Silver State 50 Miles	9:11:19 h	6
09.04	50mi	10th American River 50 Mile Endurance Run	9:40:03 h	116
11.02	50mi	11th Jed Smith Ultra Classic - 50 Mile Race	7:09:30 h	17
1988
07.08	50km	7th Skyline 50k Endurance Run	4:35:24 h	14
25.06	100mi	15th Western States 100 Mile Endurance Run	23:28:38 h	85
21.05	50mi	5th Silver State 50 Miles	9:58:34 h	7
10.04	50mi	9th American River 50 Mile Endurance Run	7:22:01 h	11
06.02	50mi	10th Jed Smith Ultra Classic - 50 Mile Race	6:36:40 h	9
1986
21.09	50km	Pacific Crest Trail 50 km	6:12:12 h	8
1985
06.10	12h	Sri Chinmoy 12 Hour Track Run Burlingame	107.338 km	8
06.07	100mi	12th Western States 100 Mile Endurance Run	23:47:02 h	93
06.04	52.4mi	The Forty-Niner Double Marathon Trail Run	8:35:54 h	25
1984
11.11	50km	John Durham Classic	3:52:00 h	3 🥉
23.06	93.5mi	11th Western States 100 Mile Endurance Run	22:13:00 h	69
02.06	50mi	Nugget 50 Mile Trail Run	8:35:35 h	12
19.05	100km/2stages	Gold Rush 100 km Two Day Race	8:28:37 h	6
15.04	50mi	5th American River 50 Mile Endurance Run	6:49:41 h	14
1983
25.06	93.5mi	10th Western States 100 Mile Endurance Run	22:31:00 h	51
28.05	50mi	Donner Trail 50 Miler	8:14:00 h	1 🏆
17.04	50mi	4th American River 50 Mile Endurance Run	7:00:56 h	29

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	27/6/1992	19th Western States 100 Mile Endurance Run	160,93	×3
✓ 2	25/6/1988	15th Western States 100 Mile Endurance Run	160,93	×3
✓ 3	6/7/1985	12th Western States 100 Mile Endurance Run	160,93	×3
✓ 4	23/6/1984	11th Western States 100 Mile Endurance Run	150,47	×3
✓ 5	25/6/1983	10th Western States 100 Mile Endurance Run	150,47	×3
✓ 6	6/10/1985	Sri Chinmoy 12 Hour Track Run Burlingame	107,34	×2
✓ 7	5/5/1996	1st Miwok 100k Trail race	100,00	×2
✓ 8	19/5/1984	Gold Rush 100 km Two Day Race	100,00	×2
✓ 9	20/10/2007	2nd San Francisco One Day, 12h	90,12	×1
✓ 10	28/10/2006	1st San Francisco One Day, 12h	89,96	×1
✓ 11	6/4/1985	The Forty-Niner Double Marathon Trail Run	84,33	×1
✓ 12	14/4/2007	28th American River 50 Mile Endurance Run	80,47	×1
✓ 13	5/4/2003	24th American River 50 Mile Endurance Run	80,47	×1
✓ 14	10/4/1999	20th American River 50 Mile Endurance Run	80,47	×1
✓ 15	6/4/1996	17th American River 50 Mile Endurance Run	80,47	×1
✓ 16	20/5/1995	10th Silver State 50 Miles	80,47	×1
✓ 17	1/4/1995	16th American River 50 Mile Endurance Run	80,47	×1
✓ 18	21/5/1994	9th Silver State 50 Miles	80,47	×1
✓ 19	16/4/1994	3rd Leona Divide 50 Mile Run	80,47	×1
✓ 20	2/4/1994	15th American River 50 Mile Endurance Run	80,47	×1
✓ 21	16/5/1992	8th Silver State 50 Miles	80,47	×1
✓ 22	4/4/1992	13th American River 50 Mile Endurance Run	80,47	×1
✓ 23	19/5/1990	7th Silver State 50 Miles	80,47	×1
✓ 24	7/4/1990	11th American River 50 Mile Endurance Run	80,47	×1
✓ 25	11/2/1990	12th Jed Smith Ultra Classic - 50 Mile Race	80,47	×1
✓ 26	20/5/1989	6th Silver State 50 Miles	80,47	×1
✓ 27	9/4/1989	10th American River 50 Mile Endurance Run	80,47	×1
✓ 28	11/2/1989	11th Jed Smith Ultra Classic - 50 Mile Race	80,47	×1
✓ 29	21/5/1988	5th Silver State 50 Miles	80,47	×1
✓ 30	10/4/1988	9th American River 50 Mile Endurance Run	80,47	×1
✓ 31	6/2/1988	10th Jed Smith Ultra Classic - 50 Mile Race	80,47	×1
✓ 32	2/6/1984	Nugget 50 Mile Trail Run	80,47	×1
✓ 33	15/4/1984	5th American River 50 Mile Endurance Run	80,47	×1
✓ 34	28/5/1983	Donner Trail 50 Miler	80,47	×1
✓ 35	17/4/1983	4th American River 50 Mile Endurance Run	80,47	×1
✓ 36	14/5/2016	1st Paiute Meadows Trail Run	50,00	×1
✓ 37	10/3/2012	23rd Way Too Cool 50K Endurance Run	50,00	×1
✓ 38	15/5/2010	25th Silver State 50 km	50,00	×1
✓ 39	8/3/2008	19th Way Too Cool 50K Endurance Run	50,00	×1
✓ 40	10/3/2007	18th Way Too Cool 50K Endurance Run	50,00	×1
✓ 41	3/2/2007	29th Jed Smith Ultra Classic - 50 km Race	50,00	×1
✓ 42	15/7/2006	5th Tahoe Rim Trail 50km Endurance Runs	50,00	×1
✓ 43	11/3/2006	17th Way Too Cool 50K Endurance Run	50,00	×1
✓ 44	16/7/2005	4th Tahoe Rim Trail 50km Endurance Runs	50,00	×1
✓ 45	12/3/2005	16th Way Too Cool 50K Endurance Run	50,00	×1
✓ 46	1/1/2005	3rd Angel Island 50k	50,00	×1
✓ 47	13/3/2004	15th Way Too Cool 50K Endurance Run	50,00	×1
✓ 48	8/3/2003	14th Way Too Cool 50K Endurance Run	50,00	×1
✓ 49	9/3/2002	13th Way Too Cool 50K Endurance Run	50,00	×1
✓ 50	10/3/2001	12th Way Too Cool 50K Endurance Run	50,00	×1
51	11/3/2000	11th Way Too Cool 50K Endurance Run	50,00	×1
52	13/3/1999	10th Way Too Cool 50K Endurance Run	50,00	×1
53	14/3/1998	9th Way Too Cool 50K Endurance Run	50,00	×1
54	15/3/1997	8th Way Too Cool 50K Endurance Run	50,00	×1
55	3/9/1995	1st Run On The Sly 50 km	50,00	×1
56	13/5/1995	12th Quicksilver 50 km Endurance Run	50,00	×1
57	11/3/1995	6th Way Too Cool 50K Endurance Run	50,00	×1
58	7/5/1994	11th Quicksilver 50 km Endurance Run	50,00	×1
59	12/3/1994	5th Way Too Cool 50K Endurance Run	50,00	×1
60	5/2/1994	16th Jed Smith Ultra Classic - 50 km Race	50,00	×1
61	13/3/1993	4th Way Too Cool 50K Endurance Run	50,00	×1
62	17/5/1992	6th Ohlone 50K Wilderness Run	50,00	×1
63	9/5/1992	9th Quicksilver 50 km Endurance Run	50,00	×1
64	14/3/1992	3rd Way Too Cool 50K Endurance Run	50,00	×1
65	10/3/1990	1st Way Too Cool 50K Endurance Run	50,00	×1
66	7/8/1988	7th Skyline 50k Endurance Run	50,00	×1
67	21/9/1986	Pacific Crest Trail 50 km	50,00	×1
68	11/11/1984	John Durham Classic	50,00	×1
69	31/12/2014	5th New Years One Day 6 Hour Run	49,70	—
70	26/11/1994	10th Quad Dipsea Trail Run	45,06	—