Ryosuke (白崎涼介) Shirasaki
ID 99852
Born : 1980 Cat. M45 Ultrarunner since 2009 JPN
27
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
51
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
1
Countries visited ?JPNJapan
46,2%
Rank quotient ?This runner's calculation uses 27 eligible race(s): Σ(rank − 1) = 7 276; Σ finishers = 15 762. 7 276 / 15 762 × 100 = 46.16%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed27
Km — ultra races3 416 km
> 100 km15
> 160 km6
> 200 km3
Longest race210,0 km
1st Donan Story Journey Run — 23/8/2024

Km per year (ultra races)

2022
2023
452
3 races
2024
515
3 races
2025
173
1 race
2026

Race types (share of distance)

Road97,1%
Trail2,9%

Records

100 km10h16'35

HISTORY

27 race(s)
DateRacePerf.Rk
2026
04.05 173km JPN20th Nagasaki Tachibana Gulf Coast Super Maranic 173 26:52:17 h17
2025
15.11 142km JPN7th Autumn leaves in Okumusashi / Chichibu Journey run 20:54:36 h32
04.05 173km JPN19th Nagasaki Tachibana Gulf Coast Super Maranic 173 30:21:11 h43
15.03 200km JPN15th Little Edo Oedo 200k 30:52:03 h50
2024
02.11 142km JPN6th Autumn leaves in Okumusashi / Chichibu Journey run 21:58:02 h44
23.08 210km JPN1st Donan Story Journey Run 38:49:27 h44
30.06 100km JPN39. Lake Saroma 100 km Ultramarathon 12:47:54 h1557
2017
23.04 118km JPN27th Fuji 5 Lakes 118 km Challenge 14:49:29 h552
04.03 204km JPN7th Little Edo Oedo 200k 34:20:51 h166
2016
24.04 118km JPN26th Fuji 5 Lakes 118 km Challenge 12:29:38 h116
05.03 204km JPN6th Little Edo Oedo 200k 32:31:25 h98
17.01 100km JPN26th Miyako 100 km Ultramarathon 11:46:56 h118
2015
20.09 100km JPN15th Tango 100 km Ultramarathon 12:33:09 h674
19.04 118km JPN25th Fuji 5 Lakes 118 km Challenge 13:19:29 h167
11.01 100km JPN25th Miyako 100 km Ultramarathon 10:16:35 h59
2014
18.05 100km JPN20th Yatsugatake Nobeyama 100 km 13:31:40 h834
20.04 108km JPN24th Fuji 5 Lakes 108 km Challenge 11:49:19 h120
2013
15.09 100km JPN13th Tango 100 km Ultramarathon 11:38:23 h342
21.04 112km JPN23rd Fuji 5 Lakes 112 km Challenge 14:06:54 h184
13.01 100km JPN23rd Miyako 100 km Ultramarathon 13:00:33 h225
2012
21.10 100km JPN18th River Shimanto 100km 10:20:06 h130
22.04 112km JPN22nd Fuji 5 Lakes 112 km Challenge 11:30:32 h71
2011
18.09 100km JPN11th Tango 100 km Ultramarathon 13:26:02 h449
30.04 112km JPN21st Fuji 5 Lakes 112 km Challenge 12:59:42 h171
2010
19.09 100km JPN10th Tango 100 km Ultramarathon 12:21:58 h283
2009
20.09 100km JPN9th Tango 100 km Ultramarathon 13:57:12 h731
04.05 70km JPN21. Yamaguchi 100 Hagi-O-Kan Maranic 70 km 8:40:36 h26