Norrie Williamson

Born : 1954 Cat. M70 Ultrarunner since 1981

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 ?

Belgium

Botswana

Canada

France

United Kingdom

Greece

Jordan

South Africa

Switzerland

United States

7,0%

Rank quotient ?This runner's calculation uses 64 eligible race(s): Σ(rank − 1) = 17 405; Σ finishers = 247 590. 17 405 / 247 590 × 100 = 7.03%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed78

Km — ultra races7 135 km

> 100 km14

> 160 km12

> 200 km3

> 24h2

Longest race1 000,0 km

Star Mazda 1000 km Ultramarathon — 1/8/1983

Km per year (ultra races)

2022

2023

2024

2025

2026

Race types (share of distance)

Road76,0%

Trail6,4%

Stage17,6%

Wins & podiums (ultra)

🏆 Win6

🏆 Win M6

🏅 Top 310

🏅 Top 3 M10

Longest winning streak1

Current streak0

Records

50 km3h43'09 100 km7h34'56 50 mi5h56'33 100 mi13h54'56 12 h123,09 km 24 h194,31 km

HISTORY

64 race(s) · 4 split(s) nested

Date		Race	Perf.	Rk
2015
11.04	52km	50th Arthur Cresswell Memorial Marathon Bergville to Ladysmith	5:20:12 h	268
2013
27.07	12h	18th Longest Day 12 Hour Track Race	82.130 km	31
2011
10.09	50km	19. Mont-Aux-Sources 50km Challenge	9:51:00 h	205
2010
09.04	48.7km	17th Dead Sea Ultra Marathon	4:19:57 h	24
2004
16.06	87km road race	79th Comrades Marathon - Up Run	9:12:32 h	2688
2003
16.06	89km road race	78th Comrades Marathon - Down Run	8:48:21 h	2520
2002
18.10	256km/6stages	3rd Kalahari Augrabies Extreme Marathon	37:34:00 h	10
17.06	87km road race	77th Comrades Marathon - Up Run	8:35:05 h	1714
2001
16.06	89km road race	76th Comrades Marathon - Down Run	7:53:13 h	1076
2000
16.06	87km road race	75th Comrades Marathon - Up Run	7:41:15 h	854
1999
16.06	89km	74th Comrades Marathon - Down Run	7:28:35 h	791
1998
04.10	88.5km	48th London to Brighton Road Race	7:23:17 h	17
29.08	24h	6th IAU 24h EC Marquette	127.605 km	92
10.05	100km	100 km Greenwich	8:25:36 h	10
01.03	40mi	12th Barry 40 Mile Track Race	4:54:35 h	6
1997
05.10	88.5km	47th London to Brighton Road Race	6:57:49 h	12
23.08	35.5mi	Two Bridges race	4:00:31 h	4
1996
31.08	104mi	Belfast to Dublin Peace Run	18:32:14 h	3 🥉
16.06	12h	Towneley 12 Hour Race	123.087 km	2 🥈
06.04	56km	27th Two Oceans Marathon	3:58:06 h	284
1995
26.08	36mi	Two Bridges race	4:13:21 h	10
15.07	50km	2nd Big Butt 50 km	3:43:09 h	1 🏆
21.05	100km	100 km Nottingham	8:24:26 h	9
15.04	56km	26th Two Oceans Marathon	3:57:21 h	305
1994
31.08	100km	Harriers 100 km Int. Challenge	7:42:25 h	4
31.08	50km	Harriers 100 km Int. Challenge - 50km Split	3:37:43 h	5
31.08	50mi	Harriers 100 km Int. Challenge - 50mi Split	6:11:48 h	6
31.05	87km	69th Comrades Marathon - Up Run	7:08:45 h	328
01.05	100km	Kalahari 100 km Ultramarathon	8:24:40 h	6
1993
03.12	100mi	Key to Shining Key Ultramarathon 100 Mile	17:17:50 h	2 🥈
06.06	100km	Kalahari 100 km Ultramarathon	8:01:10 h	4
01.05	24h	2nd IAU 24h EC Basel	194.311 km	44
01.05	100km	2nd IAU 24h EC Basel - 100km Split	9:43:27 h	39
01.05	100mi	2nd IAU 24h EC Basel - 100mi Split	19:01:39 h	46
10.04	56km	24th Two Oceans Marathon	3:55:41 h	308
1992
25.09	245.3km	10. Spartathlon	29:30:41 h	6
09.08	100km	Kalahari 100 km Ultramarathon	7:39:40 h	3 🥉
30.05	87km	67th Comrades Marathon - Up Run	6:49:27 h	181
18.04	56km	23rd Two Oceans Marathon	3:58:16 h	275
1991
31.05	89km	66th Comrades Marathon - Down Run	6:34:28 h	115
30.03	56km	22nd Two Oceans Marathon	3:54:09 h	207
1990
15.07	50mi	John Tarrant Memorial 50 mile Race	6:24:38 h	4
31.05	87km road race	65th Comrades Marathon - Up Run	6:58:23 h	268
14.04	56km	21st Two Oceans Marathon	3:53:37 h	259
1989
31.05	89km	64th Comrades Marathon - Down Run	6:07:59 h	27
25.03	56km	20th Two Oceans Marathon	3:49:03 h	117
1988
31.05	87km	63rd Comrades Marathon - Up Run	8:40:10 h	2582
17.04	100mi	Durban 100 Miles Track Race	13:54:56 h	1 🏆
02.04	56km	19th Two Oceans Marathon	3:50:13 h	135
11.01	100km	Durban 100 km Road Race	7:34:56 h	1 🏆
1987
16.10	100mi	Johannesburg 100 Mile Track Race	17:35:52 h	7
19.06	100km	IAU 100km WC -inofficial- Torhout (8. Nacht van Vlaanderen)	7:46:00 h	36
31.05	87km	62nd Comrades Marathon - Up Run	6:58:25 h	220
18.04	56km	18th Two Oceans Marathon	3:53:12 h	162
1986
10.10	100mi	Durban 100 Miles Track Race	14:44:59 h	1 🏆
23.08	36mi	Two Bridges race	3:51:03 h	10
31.05	89km	61st Comrades Marathon - Down Run	6:53:25 h	324
1985
06.07	100mi	12th Western States 100 Mile Endurance Run	27:22:41 h	120
16.06	50mi	John Tarrant Memorial 50 mile Race	5:56:33 h	8
31.05	88km	60th Comrades Marathon - Up Run	6:53:34 h	137
1984
01.06	90km	59th Comrades Marathon - Down Run	6:40:58 h	137
1983
26.08	100mi	2nd Golden Reef 100 Miler	15:53:37 h	4
01.08	1000km/10stages	Star Mazda 1000 km Ultramarathon	5d 00:46:10 h	1 🏆
31.05	88km	58th Comrades Marathon - Up Run	6:44:17 h	97
1982
14.10	100mi	Durban 100 Miles Track Race	14:26:10 h	1 🏆
31.05	91km	57th Comrades Marathon - Down Run	6:43:18 h	93
10.04	56km	13th Two Oceans Marathon	3:46:02 h	80
1981
01.06	90km	56th Comrades Marathon - Up Run	7:09:48 h	218

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	1/8/1983	Star Mazda 1000 km Ultramarathon	1 000,00	×14
✓ 2	18/10/2002	3rd Kalahari Augrabies Extreme Marathon	256,00	×3
✓ 3	25/9/1992	10. Spartathlon	245,30	×3
✓ 4	1/5/1993	2nd IAU 24h EC Basel	194,31	×2
✓ 5	31/8/1996	Belfast to Dublin Peace Run	167,37	×2
✓ 6	3/12/1993	Key to Shining Key Ultramarathon 100 Mile	160,93	×2
✓ 7	17/4/1988	Durban 100 Miles Track Race	160,93	×2
✓ 8	16/10/1987	Johannesburg 100 Mile Track Race	160,93	×2
✓ 9	10/10/1986	Durban 100 Miles Track Race	160,93	×2
✓ 10	6/7/1985	12th Western States 100 Mile Endurance Run	160,93	×2
✓ 11	26/8/1983	2nd Golden Reef 100 Miler	160,93	×2
✓ 12	14/10/1982	Durban 100 Miles Track Race	160,93	×2
✓ 13	29/8/1998	6th IAU 24h EC Marquette	127,61	×1
✓ 14	16/6/1996	Towneley 12 Hour Race	123,09	×1
✓ 15	10/5/1998	100 km Greenwich	100,00	×1
✓ 16	21/5/1995	100 km Nottingham	100,00	×1
✓ 17	31/8/1994	Harriers 100 km Int. Challenge	100,00	×1
✓ 18	1/5/1994	Kalahari 100 km Ultramarathon	100,00	×1
✓ 19	6/6/1993	Kalahari 100 km Ultramarathon	100,00	×1
✓ 20	9/8/1992	Kalahari 100 km Ultramarathon	100,00	×1
✓ 21	11/1/1988	Durban 100 km Road Race	100,00	×1
✓ 22	19/6/1987	IAU 100km WC -inofficial- Torhout (8. Nacht van Vlaanderen)	100,00	×1
✓ 23	31/5/1982	57th Comrades Marathon - Down Run	91,00	×1
✓ 24	1/6/1984	59th Comrades Marathon - Down Run	90,00	×1
✓ 25	1/6/1981	56th Comrades Marathon - Up Run	90,00	×1
✓ 26	16/6/2003	78th Comrades Marathon - Down Run (RSA)	89,00	×1
✓ 27	16/6/2001	76th Comrades Marathon - Down Run (RSA)	89,00	×1
✓ 28	16/6/1999	74th Comrades Marathon - Down Run	89,00	×1
✓ 29	31/5/1991	66th Comrades Marathon - Down Run	89,00	×1
✓ 30	31/5/1989	64th Comrades Marathon - Down Run	89,00	×1
✓ 31	31/5/1986	61st Comrades Marathon - Down Run	89,00	×1
✓ 32	4/10/1998	48th London to Brighton Road Race	88,50	×1
✓ 33	5/10/1997	47th London to Brighton Road Race	88,50	×1
✓ 34	31/5/1985	60th Comrades Marathon - Up Run	88,00	×1
✓ 35	31/5/1983	58th Comrades Marathon - Up Run	88,00	×1
✓ 36	16/6/2004	79th Comrades Marathon - Up Run (RSA)	87,00	×1
✓ 37	17/6/2002	77th Comrades Marathon - Up Run (RSA)	87,00	×1
✓ 38	16/6/2000	75th Comrades Marathon - Up Run (RSA)	87,00	×1
✓ 39	31/5/1994	69th Comrades Marathon - Up Run	87,00	×1
✓ 40	30/5/1992	67th Comrades Marathon - Up Run	87,00	×1
✓ 41	31/5/1990	65th Comrades Marathon - Up Run (RSA)	87,00	×1
✓ 42	31/5/1988	63rd Comrades Marathon - Up Run	87,00	×1
✓ 43	31/5/1987	62nd Comrades Marathon - Up Run	87,00	×1
✓ 44	27/7/2013	18th Longest Day 12 Hour Track Race	82,13	×1
✓ 45	15/7/1990	John Tarrant Memorial 50 mile Race	80,47	×1
✓ 46	16/6/1985	John Tarrant Memorial 50 mile Race	80,47	×1
✓ 47	1/3/1998	12th Barry 40 Mile Track Race	64,37	—
✓ 48	26/8/1995	Two Bridges race	57,94	—
✓ 49	23/8/1986	Two Bridges race	57,94	—
✓ 50	23/8/1997	Two Bridges race	57,13	—
✓ 51	6/4/1996	27th Two Oceans Marathon	56,00	—
✓ 52	15/4/1995	26th Two Oceans Marathon	56,00	—
✓ 53	10/4/1993	24th Two Oceans Marathon	56,00	—
✓ 54	18/4/1992	23rd Two Oceans Marathon	56,00	—
✓ 55	30/3/1991	22nd Two Oceans Marathon	56,00	—
✓ 56	14/4/1990	21st Two Oceans Marathon	56,00	—
57	25/3/1989	20th Two Oceans Marathon	56,00	—
58	2/4/1988	19th Two Oceans Marathon	56,00	—
59	18/4/1987	18th Two Oceans Marathon	56,00	—
60	10/4/1982	13th Two Oceans Marathon	56,00	—
61	11/4/2015	50th Arthur Cresswell Memorial Marathon Bergville to Ladysmith	52,00	—
62	10/9/2011	19. Mont-Aux-Sources 50km Challenge	50,00	—
63	15/7/1995	2nd Big Butt 50 km	50,00	—
64	9/4/2010	17th Dead Sea Ultra Marathon	48,70	—