Ryo (安孫子亮) Abiko

Born : 1975 Cat. M50 Ultrarunner since 2003

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 ?

France

Greece

Hong Kong

Japan

Netherlands

Poland

Taiwan

4,3%

Rank quotient ?This runner's calculation uses 78 eligible race(s): Σ(rank − 1) = 1 136; Σ finishers = 26 666. 1 136 / 26 666 × 100 = 4.26%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed78

Km — ultra races12 111 km

> 100 km43

> 160 km34

> 200 km28

> 24h22

Longest race503,0 km

16th River Road Foot Race 503 km — 30/4/2021

Km per year (ultra races)

449

2022

665

2023

547

2024

382

2025

185

2026

Race types (share of distance)

Road84,1%

Trail15,9%

Wins & podiums (ultra)

🏆 Win9

🏆 Win M9

🏅 Top 319

🏅 Top 3 M19

Longest winning streak2

Current streak0

Records

100 km7h39'48 6 h80,98 km 12 h144,24 km 24 h255,49 km

HISTORY

84 race(s) · 12 split(s) nested

Date		Race	Perf.	Rk
2026
28.03	24h	17th Jingu Gaien 24 Hour Challenge	185.405 km	21
2025
18.10	100km	8th Iki 100 km Ultra Marathon	9:10:16 h	13
13.09	6h	20. Shonan Int. Relay Marathon 6 hour Run	70.659 km	1 🏆
08.03	24h	16th Jingu Gaien 24 Hour Challenge	211.413 km	10
08.03	6h	16th Jingu Gaien 24 Hour Challenge - 6h Split	64.903 km	26
08.03	12h	16th Jingu Gaien 24 Hour Challenge -12h Split	116.561 km	23
2024
28.09	246km	41. Spartathlon	34:59:36 h	141
21.05	24h	3rd Hirosaki 24h Ultra Run	190.878 km	25
20.04	110km	30. Sakura Michi Kokusai Nature Run (Half)	10:18:00 h	3 🥉
2023
24.09	100km	31. Akita Nairiku 100km Marathon	8:48:54 h	19
10.06	12h	1st Aizu Yanaizu Akabeko Marathon - 12h	109.110 km	8
21.04	250km	29. Sakura Michi Kokusai Nature Run	32:26:00 h	13
11.03	24h	15th Jingu Gaien 24 Hour Challenge	205.655 km	20
11.03	6h	15th Jingu Gaien 24 Hour Challenge - 6h Split	64.876 km	21
11.03	12h	15th Jingu Gaien 24 Hour Challenge -12h Split	121.808 km	18
2022
25.09	100km	30. Akita Nairiku 100km Marathon	8:21:47 h	7
05.06	78km	29. Ultramarathon Okumusashi	6:25:35 h	19
09.04	71km	17th Toda Saiko 70 km	6:11:06 h	11
09.01	200km	2nd Japan Trophy 200	19:51:00 h	5
2021
30.10	146km	3rd Autumn leaves in Okumusashi / Chichibu Journey run	14:57:49 h	3 🥉
17.07	24h	1st Japan Trophy 24h	201.000 km	8
30.04	503km	16th River Road Foot Race 503 km	4d 10:46:07 h	15
10.04	70km	16th Toda Saiko 70 km	5:47:15 h	47
10.01	200km	1st Japan Trophy 200	21:57:00 h	12
2020
19.09	123km	3rd Utsukushima Fukushima Journey Run 123K	12:20:26 h	1 🏆
05.07	8h	26th 8-Hour Endurance Race Tokorozawa	83.300 km	11
08.02	12h	9th Taipei 12hr Ultra Marathon	136.592 km	1 🏆
08.02	50km	9th Taipei 12hr Ultra Marathon - 50km Split	4:16:16 h	2 🥈
08.02	6h	9th Taipei 12hr Ultra Marathon - 6h Split	70.875 km	2 🥈
08.02	50mi	9th Taipei 12hr Ultra Marathon - 50mi Split	6:53:44 h	2 🥈
08.02	100km	9th Taipei 12hr Ultra Marathon - 100km Split	8:46:12 h	2 🥈
2019
26.10	6h	7ème IAU 24h WC, 24 heures d'Albi - 6h Split	68.689 km	21
26.10	12h	7ème IAU 24h WC, 24 heures d'Albi - 12h Split	122.365 km	82
26.10	24h	7ème IAU 24h WC, 24 heures d'Albi	210.608 km	102
26.10	100km	7ème IAU 24h WC, 24 heures d'Albi - 100 km Split	9:11:50 h	58
26.10	100mi	7ème IAU 24h WC, 24 heures d'Albi - 100 mi Split	18:03:21 h	136
22.09	100km	29. Akita Nairiku 100km Marathon	7:59:13 h	7
07.09	115km	3rd Miyagi Yumeguri Ultra Marathon - 115 km	10:30:34 h	1 🏆
29.06	8h	25th 8-Hour Endurance Race Tokorozawa	98.000 km	5
02.06	78km	26. Ultramarathon Okumusashi	6:13:24 h	17
20.04	250km	26. Sakura Michi Kokusai Nature Run	30:22:00 h	25
2018
10.11	24h	13th Jingu Gaien 24 Hour Challenge	245.689 km	5
15.09	24h	21. Hiratsuka 24 hour race	237.000 km	1 🏆
01.09	115k	2nd Miyagi Yumeguri Ultra Marathon - 115 km	10:48:07 h	1 🏆
30.06	8h	24th 8-Hour Endurance Race Tokorozawa	88.200 km	6
03.06	78km	25. Ultramarathon Okumusashi	6:26:45 h	16
21.04	250km	25. Sakura Michi Kokusai Nature Run	31:01:00 h	12
2017
11.11	24h	12th Jingu Gaien 24 Hour Challenge	240.359 km	3 🥉
15.10	100km	6th Noto Peninsula 100 km Ultra Marathon	8:19:27 h	2 🥈
09.09	12h	20. Hiratsuka 12 hour race	129.750 km	3 🥉
02.07	8h	23th 8-Hour Endurance Race Tokorozawa - 3 tai	84.396 km	2 🥈
04.06	78km	24. Ultramarathon Okumusashi	6:21:01 h	21
22.04	250km	24. Sakura Michi Kokusai Nature Run	28:23:59 h	9
2016
17.12	24h	11th Jingu Gaien 24 Hour Challenge	231.935 km	10
16.10	100km	22nd River Shimanto 100km	7:58:56 h	14
24.09	12h	19. Hiratsuka 12 hour race	124.560 km	3 🥉
03.07	8h	22th 8-Hour Endurance Race Tokorozawa - 3 tai	71.412 km	21
05.06	78km	23. Ultramarathon Okumusashi	7:13:17 h	102
2015
19.12	24h	10th Jingu Gaien 24 Hour Challenge	186.897 km	37
27.09	100km	25. Akita Nairiku 100km Marathon	7:54:07 h	9
12.07	8h	21th 8-Hour Endurance Race Tokorozawa - 3 tai	75.739 km	11
18.04	250km	22. Sakura Michi Kokusai Nature Run	24:54:56 h	1 🏆
30.01	24h	1st Hong Kong Ultra Marathon 24hr	231.712 km	3 🥉
2014
08.11	24h	9th Jingu Gaien 24 Hour Challenge	224.292 km	9
08.11	6h	9th Jingu Gaien 24 Hour Challenge - 6h Split	68.877 km	8
08.11	12h	9th Jingu Gaien 24 Hour Challenge -12h Split	127.158 km	9
13.09	12h	17. Hiratsuka 12 hour race	96.880 km	10
29.06	100km	29. Lake Saroma 100 km Ultramarathon	7:55:55 h	29
20.04	100km	24th Fuji 5 Lakes 100 km Challenge	8:08:56 h	7
2013
09.11	24h	8th Jingu Gaien 24 Hour Challenge	216.657 km	14
22.09	100km	23. Akita Nairiku 100km Marathon	7:39:48 h	6
28.07	77km	20. Ultramarathon Okumusashi	6:12:48 h	9
11.05	12h	9e 24uur van Steenbergen - 12h Split	138.848 km	5
11.05	24h	9e 24uur van Steenbergen - open race	246.300 km	12
11.05	24h	IAU 24h WC Steenbergen (9e 24uur van Steenbergen)	246.300 km	11
2012
08.09	100mi	IAU 24h WC Katowice - 100mi split	14:27:31 h	6
08.09	24h	IAU 24h WC Katowice	255.487 km	4
16.06	12h	11. Tokyo Challenge 12 hours	144.240 km	1 🏆
21.04	250km	19. Sakura Michi Kokusai Nature Run	24:38:00 h	2 🥈
2011
15.10	24h	6th Jingu Gaien 24 Hour Challenge	238.338 km	4
24.09	6h	14. Hiratsuka 6 hour race	62.280 km	25
07.08	77km	18. Ultramarathon Okumusashi	5:54:25 h	11
11.06	6h	10. Tokyo Challenge 6 hours	80.977 km	1 🏆
2010
26.09	100km	20. Akita Nairiku 100km Marathon	8:13:13 h	10
01.08	77km	17. Ultramarathon Okumusashi	6:09:49 h	9
13.05	6h	IAU 24h WC Brive (Les 24 heures de Brive) - 6h Split	67.901 km	32
13.05	12h	IAU 24h WC Brive (Les 24 heures de Brive) - 12h Split	130.593 km	25
13.05	24h	IAU 24h WC Brive (Les 24 heures de Brive)	242.661 km	20
2009
12.09	24h	4th Jingu Gaien 24 Hour Challenge	231.261 km	4
13.06	24h	8. Tokyo Challenge 24 hours	216.480 km	2 🥈
18.04	250km	16. Sakura Michi Kokusai Nature Run	32:45:00 h	26
11.01	100km	19th Miyako 100 km Ultramarathon	8:17:08 h	4
2008
05.07	24h	3rd Jingu Gaien 24 Hour Challenge	182.874 km	12
19.04	250km	15. Sakura Michi Kokusai Nature Run	33:42:00 h	36
2005
16.10	100km	11th River Shimanto 100km	9:14:30 h	58
2003
11.05	71km	9th Yatsugatake Nobeyama 71 km	6:50:46 h	15

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	30/4/2021	16th River Road Foot Race 503 km	503,00	×5
✓ 2	8/9/2012	IAU 24h WC Katowice	255,49	×2
✓ 3	21/4/2023	29. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 4	20/4/2019	26. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 5	21/4/2018	25. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 6	22/4/2017	24. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 7	18/4/2015	22. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 8	21/4/2012	19. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 9	18/4/2009	16. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 10	19/4/2008	15. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 11	11/5/2013	9e 24uur van Steenbergen - open race	246,30	×2
✓ 12	28/9/2024	41. Spartathlon	246,00	×2
✓ 13	10/11/2018	13th Jingu Gaien 24 Hour Challenge	245,69	×2
✓ 14	13/5/2010	IAU 24h WC Brive (Les 24 heures de Brive)	242,66	×2
✓ 15	11/11/2017	12th Jingu Gaien 24 Hour Challenge	240,36	×2
✓ 16	15/10/2011	6th Jingu Gaien 24 Hour Challenge	238,34	×2
✓ 17	15/9/2018	21. Hiratsuka 24 hour race	237,00	×2
✓ 18	17/12/2016	11th Jingu Gaien 24 Hour Challenge	231,94	×2
✓ 19	30/1/2015	1st Hong Kong Ultra Marathon 24hr	231,71	×2
✓ 20	12/9/2009	4th Jingu Gaien 24 Hour Challenge	231,26	×2
✓ 21	8/11/2014	9th Jingu Gaien 24 Hour Challenge	224,29	×2
✓ 22	9/11/2013	8th Jingu Gaien 24 Hour Challenge	216,66	×2
✓ 23	13/6/2009	8. Tokyo Challenge 24 hours	216,48	×2
✓ 24	8/3/2025	16th Jingu Gaien 24 Hour Challenge	211,41	×2
✓ 25	26/10/2019	7ème IAU 24h WC, 24 heures d'Albi	210,61	×2
✓ 26	11/3/2023	15th Jingu Gaien 24 Hour Challenge	205,66	×2
✓ 27	17/7/2021	1st Japan Trophy 24h	201,00	×2
✓ 28	9/1/2022	2nd Japan Trophy 200	200,00	×2
✓ 29	10/1/2021	1st Japan Trophy 200	200,00	×2
✓ 30	21/5/2024	3rd Hirosaki 24h Ultra Run	190,88	×2
✓ 31	19/12/2015	10th Jingu Gaien 24 Hour Challenge	186,90	×2
✓ 32	28/3/2026	17th Jingu Gaien 24 Hour Challenge	185,41	×2
✓ 33	5/7/2008	3rd Jingu Gaien 24 Hour Challenge	182,87	×1
✓ 34	30/10/2021	3rd Autumn leaves in Okumusashi / Chichibu Journey run	146,00	×1
✓ 35	16/6/2012	11. Tokyo Challenge 12 hours	144,24	×1
✓ 36	8/2/2020	9th Taipei 12hr Ultra Marathon	136,59	×1
✓ 37	9/9/2017	20. Hiratsuka 12 hour race	129,75	×1
✓ 38	24/9/2016	19. Hiratsuka 12 hour race	124,56	×1
✓ 39	19/9/2020	3rd Utsukushima Fukushima Journey Run 123K	123,00	×1
✓ 40	7/9/2019	3rd Miyagi Yumeguri Ultra Marathon - 115 km	115,00	×1
✓ 41	20/4/2024	30. Sakura Michi Kokusai Nature Run (Half)	110,00	×1
✓ 42	10/6/2023	1st Aizu Yanaizu Akabeko Marathon - 12h	109,11	×1
✓ 43	18/10/2025	8th Iki 100 km Ultra Marathon	100,00	×1
✓ 44	24/9/2023	31. Akita Nairiku 100km Marathon	100,00	×1
✓ 45	25/9/2022	30. Akita Nairiku 100km Marathon	100,00	×1
✓ 46	22/9/2019	29. Akita Nairiku 100km Marathon	100,00	×1
✓ 47	15/10/2017	6th Noto Peninsula 100 km Ultra Marathon	100,00	×1
✓ 48	16/10/2016	22nd River Shimanto 100km	100,00	×1
✓ 49	27/9/2015	25. Akita Nairiku 100km Marathon	100,00	×1
✓ 50	29/6/2014	29. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 51	20/4/2014	24th Fuji 5 Lakes 100 km Challenge	100,00	×1
✓ 52	22/9/2013	23. Akita Nairiku 100km Marathon	100,00	×1
✓ 53	26/9/2010	20. Akita Nairiku 100km Marathon	100,00	×1
✓ 54	11/1/2009	19th Miyako 100 km Ultramarathon	100,00	×1
✓ 55	16/10/2005	11th River Shimanto 100km	100,00	×1
✓ 56	29/6/2019	25th 8-Hour Endurance Race Tokorozawa	98,00	×1
✓ 57	13/9/2014	17. Hiratsuka 12 hour race	96,88	×1
✓ 58	30/6/2018	24th 8-Hour Endurance Race Tokorozawa	88,20	—
✓ 59	2/7/2017	23th 8-Hour Endurance Race Tokorozawa - 3 tai	84,40	—
✓ 60	5/7/2020	26th 8-Hour Endurance Race Tokorozawa	83,30	—
✓ 61	11/6/2011	10. Tokyo Challenge 6 hours	80,98	—
✓ 62	5/6/2022	29. Ultramarathon Okumusashi	78,00	—
✓ 63	2/6/2019	26. Ultramarathon Okumusashi	78,00	—
✓ 64	3/6/2018	25. Ultramarathon Okumusashi	78,00	—
✓ 65	4/6/2017	24. Ultramarathon Okumusashi	78,00	—
✓ 66	5/6/2016	23. Ultramarathon Okumusashi	78,00	—
✓ 67	28/7/2013	20. Ultramarathon Okumusashi	77,00	—
✓ 68	7/8/2011	18. Ultramarathon Okumusashi	77,00	—
✓ 69	1/8/2010	17. Ultramarathon Okumusashi	77,00	—
✓ 70	12/7/2015	21th 8-Hour Endurance Race Tokorozawa - 3 tai	75,74	—
✓ 71	3/7/2016	22th 8-Hour Endurance Race Tokorozawa - 3 tai	71,41	—
72	9/4/2022	17th Toda Saiko 70 km	71,00	—
73	11/5/2003	9th Yatsugatake Nobeyama 71 km	71,00	—
74	13/9/2025	20. Shonan Int. Relay Marathon 6 hour Run	70,66	—
75	10/4/2021	16th Toda Saiko 70 km	70,00	—
76	24/9/2011	14. Hiratsuka 6 hour race	62,28	—