Ling-Ru Chu

Born : 1974 Cat. W50 Ultrarunner since 2004

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

60,1%

Rank quotient ?This runner's calculation uses 64 eligible race(s): Σ(rank − 1) = 9 373; Σ finishers = 15 591. 9 373 / 15 591 × 100 = 60.12%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed64

Km — ultra races5 320 km

> 100 km12

> 160 km12

Longest race193,1 km

5th Fat Dog 120 Mile Trail Race — 15/8/2014

Km per year (ultra races)

2022

100

2023

2024

2025

2026

Race types (share of distance)

Trail100,0%

Wins & podiums (ultra)

🏆 Win0

🏆 Win F1

🏅 Top 30

🏅 Top 3 F1

Longest winning streak0

Current streak0

Records

50 km5h07'00 100 km12h13'10 50 mi9h27'34 100 mi22h37'43

HISTORY

64 race(s)

Date		Race	Perf.	Rk
2023
03.06	50km	11th Marin Ultra Challenge 50 km Race	7:55:02 h	137
18.02	50km	11th FOURmidable 50K	7:41:37 h	167
2022
12.03	50km	10th Marin Ultra Challenge 50 km Race	7:22:13 h	174
2021
28.08	100mi	23rd Cascade Crest Classic 100 Mile	33:31:15 h	100
15.05	50km	36th Silver State 50 km	8:17:07 h	57
2019
24.08	100mi	21st Cascade Crest Classic 100 Mile	31:27:09 h	90
13.07	50km	9th Golden Gate 50 km Summer Trail Run	7:09:54 h	30
22.06	50km	8th Rodeo Valley 50 km Trail Run	6:55:40 h	40
18.05	50km	34th Silver State 50 km	7:32:23 h	54
2018
22.09	50km	8th Coastal 50 km Trail Run	7:18:46 h	49
25.08	31.5mi	19th Tamalpa Headlands 50K	7:39:40 h	111
2017
26.08	31.5mi	18th Tamalpa Headlands 50K	8:00:29 h	108
2016
16.07	50mi	15th Tahoe Rim Trail 50M Endurance Run	14:41:10 h	91
21.05	50km	31st Silver State 50 km	8:13:26 h	58
10.04	50km	1st Ruck a Chuck 50K	6:43:57 h	46
2014
15.08	120mi	5th Fat Dog 120 Mile Trail Race	46:06:48 h	76
26.07	50km	16th Siskiyou Out Back 50 km Trail Run	7:09:47 h	168
17.05	50km	29th Silver State 50 km	7:57:53 h	52
05.04	50mi	35th American River 50 Mile Endurance Run	10:59:31 h	447
2013
27.09	100mi	15th The Bear 100 Mile Endurance Run	34:42:00 h	144
03.08	100mi	26th Angeles Crest 100 Mile	29:06:21 h	39
27.04	50mi	21st Leona Divide 50 Mile Run	12:23:46 h	183
06.04	50mi	34th American River 50 Mile Endurance Run	10:10:24 h	351
2012
29.09	50km	1st Lost Sierra Endurance Run	9:55:09 h	70
15.09	50mi	6th Headlands Hundred 50 Mile Endurance Run	12:27:30 h	40
23.06	100mi	39th Western States 100 Mile Endurance Run	25:54:42 h	178
07.04	50mi	33rd American River 50 Mile Endurance Run	9:38:34 h	233
2011
09.04	50mi	32nd American River 50 Mile Endurance Run	10:05:03 h	267
2010
11.09	100mi	10th Rio Del Lago 100 Mile	27:11:34 h	32
28.08	100mi	23rd Angeles Crest 100 Mile	32:25:38 h	58
27.03	50mi	3rd Lake Sonoma 50 Mile Race	12:57:40 h	125
13.03	50km	21st Way Too Cool 50K Endurance Run	6:30:45 h	278
2009
28.11	28mi	25th Quad Dipsea Trail Run	6:58:11 h	136
10.10	50mi	27th Dick Collins Firetrails 50 Mile	11:04:19 h	164
22.08	100mi	27th Leadville Trail 100 Mile	29:20:15 h	216
27.06	100mi	36th Western States 100 Mile Endurance Run	27:53:43 h	135
04.04	50mi	30th American River 50 Mile Endurance Run	9:32:07 h	177
14.03	50km	20th Way Too Cool 50K Endurance Run	5:42:51 h	198
2008
11.10	50mi	26th Dick Collins Firetrails 50 Mile	10:46:35 h	107
27.09	100mi	9th Rio Del Lago 100 Mile	22:37:43 h	8
23.08	31.5mi	11th Tamalpa Headlands 50K	6:05:02 h	22
03.08	50km	27th Skyline 50k Endurance Run	5:35:31 h	47
18.05	50km	21st Ohlone 50K Wilderness Run	7:32:52 h	51
03.05	100km	13th Miwok 100k Trail race	12:13:10 h	94
05.04	50mi	29th American River 50 Mile Endurance Run	9:27:34 h	166
08.03	50km	19th Way Too Cool 50K Endurance Run	5:07:00 h	147
2007
13.10	50mi	25th Dick Collins Firetrails 50 Mile	10:32:19 h	120
05.05	100km	12th Miwok 100k Trail race	13:58:54 h	140
14.04	50mi	28th American River 50 Mile Endurance Run	10:35:44 h	310
10.03	50km	18th Way Too Cool 50K Endurance Run	5:42:10 h	206
2006
07.10	50mi	24th Dick Collins Firetrails 50 Mile	10:43:18 h	94
01.04	50mi	27th American River 50 Mile Endurance Run	10:30:40 h	259
11.03	50km	17th Way Too Cool 50K Endurance Run	7:31:28 h	350
2005
04.09	50km	11th Run On The Sly 50 km	7:51:41 h	64
25.06	100mi	32th Western States 100 Mile Endurance Run	29:32:00 h	298
30.04	100km	10th Miwok 100k Trail race	14:57:33 h	198
02.04	50mi	26th American River 50 Mile Endurance Run	9:52:46 h	212
12.03	50km	16th Way Too Cool 50K Endurance Run	6:55:00 h	346
2004
06.11	50mi	9th Helen Klein Ultra Classic 50mi	10:51:13 h	62
09.10	50mi	22nd Dick Collins Firetrails 50 Mile	10:56:15 h	81
05.09	50km	10th Run On The Sly 50 km	7:41:07 h	63
01.08	50km	23rd Skyline 50k Endurance Run	6:51:22 h	123
03.04	50mi	25th American River 50 Mile Endurance Run	11:58:07 h	416
13.03	50km	15th Way Too Cool 50K Endurance Run	6:47:26 h	374

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	15/8/2014	5th Fat Dog 120 Mile Trail Race	193,12	×3
✓ 2	28/8/2021	23rd Cascade Crest Classic 100 Mile	160,93	×3
✓ 3	24/8/2019	21st Cascade Crest Classic 100 Mile	160,93	×3
✓ 4	27/9/2013	15th The Bear 100 Mile Endurance Run	160,93	×3
✓ 5	3/8/2013	26th Angeles Crest 100 Mile	160,93	×3
✓ 6	23/6/2012	39th Western States 100 Mile Endurance Run	160,93	×3
✓ 7	11/9/2010	10th Rio Del Lago 100 Mile	160,93	×3
✓ 8	28/8/2010	23rd Angeles Crest 100 Mile	160,93	×3
✓ 9	22/8/2009	27th Leadville Trail 100 Mile	160,93	×3
✓ 10	27/6/2009	36th Western States 100 Mile Endurance Run	160,93	×3
✓ 11	27/9/2008	9th Rio Del Lago 100 Mile	160,93	×3
✓ 12	25/6/2005	32th Western States 100 Mile Endurance Run	160,93	×3
✓ 13	3/5/2008	13th Miwok 100k Trail race	100,00	×1
✓ 14	5/5/2007	12th Miwok 100k Trail race	100,00	×1
✓ 15	30/4/2005	10th Miwok 100k Trail race	100,00	×1
✓ 16	16/7/2016	15th Tahoe Rim Trail 50M Endurance Run	80,47	×1
✓ 17	5/4/2014	35th American River 50 Mile Endurance Run	80,47	×1
✓ 18	27/4/2013	21st Leona Divide 50 Mile Run	80,47	×1
✓ 19	6/4/2013	34th American River 50 Mile Endurance Run	80,47	×1
✓ 20	15/9/2012	6th Headlands Hundred 50 Mile Endurance Run	80,47	×1
✓ 21	7/4/2012	33rd American River 50 Mile Endurance Run	80,47	×1
✓ 22	9/4/2011	32nd American River 50 Mile Endurance Run	80,47	×1
✓ 23	27/3/2010	3rd Lake Sonoma 50 Mile Race	80,47	×1
✓ 24	10/10/2009	27th Dick Collins Firetrails 50 Mile	80,47	×1
✓ 25	4/4/2009	30th American River 50 Mile Endurance Run	80,47	×1
✓ 26	11/10/2008	26th Dick Collins Firetrails 50 Mile	80,47	×1
✓ 27	5/4/2008	29th American River 50 Mile Endurance Run	80,47	×1
✓ 28	13/10/2007	25th Dick Collins Firetrails 50 Mile	80,47	×1
✓ 29	14/4/2007	28th American River 50 Mile Endurance Run	80,47	×1
✓ 30	7/10/2006	24th Dick Collins Firetrails 50 Mile	80,47	×1
✓ 31	1/4/2006	27th American River 50 Mile Endurance Run	80,47	×1
✓ 32	2/4/2005	26th American River 50 Mile Endurance Run	80,47	×1
✓ 33	6/11/2004	9th Helen Klein Ultra Classic 50mi	80,47	×1
✓ 34	9/10/2004	22nd Dick Collins Firetrails 50 Mile	80,47	×1
✓ 35	3/4/2004	25th American River 50 Mile Endurance Run	80,47	×1
✓ 36	25/8/2018	19th Tamalpa Headlands 50K	50,69	—
✓ 37	26/8/2017	18th Tamalpa Headlands 50K	50,69	—
✓ 38	23/8/2008	11th Tamalpa Headlands 50K	50,69	—
✓ 39	3/6/2023	11th Marin Ultra Challenge 50 km Race	50,00	—
✓ 40	18/2/2023	11th FOURmidable 50K	50,00	—
✓ 41	12/3/2022	10th Marin Ultra Challenge 50 km Race	50,00	—
✓ 42	15/5/2021	36th Silver State 50 km	50,00	—
✓ 43	13/7/2019	9th Golden Gate 50 km Summer Trail Run	50,00	—
✓ 44	22/6/2019	8th Rodeo Valley 50 km Trail Run	50,00	—
✓ 45	18/5/2019	34th Silver State 50 km	50,00	—
✓ 46	22/9/2018	8th Coastal 50 km Trail Run	50,00	—
✓ 47	21/5/2016	31st Silver State 50 km	50,00	—
✓ 48	10/4/2016	1st Ruck a Chuck 50K	50,00	—
✓ 49	26/7/2014	16th Siskiyou Out Back 50 km Trail Run	50,00	—
✓ 50	17/5/2014	29th Silver State 50 km	50,00	—
51	29/9/2012	1st Lost Sierra Endurance Run	50,00	—
52	13/3/2010	21st Way Too Cool 50K Endurance Run	50,00	—
53	14/3/2009	20th Way Too Cool 50K Endurance Run	50,00	—
54	3/8/2008	27th Skyline 50k Endurance Run	50,00	—
55	18/5/2008	21st Ohlone 50K Wilderness Run	50,00	—
56	8/3/2008	19th Way Too Cool 50K Endurance Run	50,00	—
57	10/3/2007	18th Way Too Cool 50K Endurance Run	50,00	—
58	11/3/2006	17th Way Too Cool 50K Endurance Run	50,00	—
59	4/9/2005	11th Run On The Sly 50 km	50,00	—
60	12/3/2005	16th Way Too Cool 50K Endurance Run	50,00	—
61	5/9/2004	10th Run On The Sly 50 km	50,00	—
62	1/8/2004	23rd Skyline 50k Endurance Run	50,00	—
63	13/3/2004	15th Way Too Cool 50K Endurance Run	50,00	—
64	28/11/2009	25th Quad Dipsea Trail Run	45,06	—