Robert M. Davidson

Born : 1955 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 ?

Netherlands

United States

68,8%

Rank quotient ?This runner's calculation uses 19 eligible race(s): Σ(rank − 1) = 405; Σ finishers = 589. 405 / 589 × 100 = 68.76%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed19

Km — ultra races2 042 km

> 100 km8

> 160 km4

> 200 km1

> 24h8

> 48h2

Longest race205,6 km

48 Hour Run, Walk or Crawl Pedestrian Race — 1/7/1983

Km per year (ultra races)

2022

2023

2024

2025

2026

Race types (share of distance)

Road71,0%

Trail29,0%

Records

50 km7h01'45 100 km10h54'33 50 mi9h52'13 100 mi31h53'41 24 h169,79 km 48 h205,59 km

HISTORY

19 race(s) · 4 split(s) nested

Date		Race	Perf.	Rk
1993
15.05	50km	4th Zane Grey Highline Trail 50 km	7:01:45 h	13
1991
27.04	50mi	2nd Zane Grey Highline Trail 50 Mile	13:03:00 h	13
1990
31.12	24h	8th Across the Years, 24h	81.600 km	14
1989
31.12	24h	7th Across the Years, 24h	109.200 km	14
30.09	100mi	4th Angeles Crest 100 Mile	31:53:41 h	69
09.04	50mi	Mad Dog 50 Mile	13:47:00 h	17
1988
30.12	48h	6th Across the Years, 48h	179.600 km	9
10.04	50mi	Mad Dog 50 Mile	10:06:30 h	9
1986
14.12	50mi	2nd Palm Springs Fifty	9:52:13 h	31
02.03	50mi	Four Peaks Fifty Run	12:33:00 h	9
1985
14.09	100km	10. RUN Winschoten 100 km	10:54:33 h	93
1984
31.12	24h	2nd Across the Years, 24h	104.000 km	13
31.12	50mi	2nd Across the Years, 24h - 50mi Split	9:00:58 h	6
31.12	100km	2nd Across the Years, 24h - 100km Split	13:48:32 h	10
27.10	24h	No Bullshit 24 hour Run	169.785 km	4
04.03	50mi	Four Peaks Fifty Run	10:16:15 h	36
1983
31.12	24h	1st Across the Years, 24h	120.800 km	11
31.12	50mi	1st Across the Years, 24h - 50mi Split	8:53:19 h	6
31.12	100km	1st Across the Years, 24h - 100km Split	13:41:54 h	8
29.10	24h	No Bullshit 24 hour Run	137.196 km	13
01.07	48h	48 Hour Run, Walk or Crawl Pedestrian Race	205.593 km	6
06.03	50mi	Four Peaks Fifty Run	11:41:50 h	25
1981
26.07	37.5mi	4th Haleakala Run to the Sun	7:14:29 h	25

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	1/7/1983	48 Hour Run, Walk or Crawl Pedestrian Race	205,59	×5
✓ 2	30/12/1988	6th Across the Years, 48h	179,60	×4
✓ 3	27/10/1984	No Bullshit 24 hour Run	169,79	×4
✓ 4	30/9/1989	4th Angeles Crest 100 Mile	160,93	×4
✓ 5	29/10/1983	No Bullshit 24 hour Run	137,20	×3
✓ 6	31/12/1983	1st Across the Years, 24h	120,80	×3
✓ 7	31/12/1989	7th Across the Years, 24h	109,20	×2
✓ 8	31/12/1984	2nd Across the Years, 24h	104,00	×2
✓ 9	14/9/1985	10. RUN Winschoten 100 km	100,00	×2
✓ 10	31/12/1990	8th Across the Years, 24h	81,60	×2
✓ 11	27/4/1991	2nd Zane Grey Highline Trail 50 Mile	80,47	×2
✓ 12	9/4/1989	Mad Dog 50 Mile	80,47	×2
✓ 13	10/4/1988	Mad Dog 50 Mile	80,47	×2
✓ 14	14/12/1986	2nd Palm Springs Fifty	80,47	×2
✓ 15	2/3/1986	Four Peaks Fifty Run	80,47	×2
✓ 16	4/3/1984	Four Peaks Fifty Run	80,47	×2
✓ 17	6/3/1983	Four Peaks Fifty Run	80,47	×2
✓ 18	26/7/1981	4th Haleakala Run to the Sun	60,35	×1
✓ 19	15/5/1993	4th Zane Grey Highline Trail 50 km	50,00	×1