Masahiro (大井雅宏) Oi
ID 176146
Born : 1968 Cat. M55 Ultrarunner since 2006 JPN
43
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
50
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
20,2%
Rank quotient ?This runner's calculation uses 43 eligible race(s): Σ(rank − 1) = 7 433; Σ finishers = 36 751. 7 433 / 36 751 × 100 = 20.23%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed43
Km — ultra races3 774 km
> 100 km3
> 160 km2
Longest race167,0 km
7th Ultra-Trail Mt. Fuji (UTMF) — 22/4/2022

Km per year (ultra races)

237
2 races
2022
100
1 race
2023
100
1 race
2024
2025
2026

Race types (share of distance)

Road47,1%
Trail52,9%

Wins & podiums (ultra)

🏆 Win0
🏆 Win M0
🏅 Top 31
🏅 Top 3 M1
Longest winning streak0
Current streak0

Records

50 km5h44'23100 km9h35'0250 mi11h16'10100 mi41h40'02

HISTORY

43 race(s)
DateRacePerf.Rk
2024
19.05 100km JPN30th Yatsugatake Nobeyama 100 km 10:57:24 h134
2023
21.05 100km JPN29th Yatsugatake Nobeyama 100 km 11:16:10 h77
2022
22.04 167km JPN7th Ultra-Trail Mt. Fuji 32:09:14 h400
10.04 70km JPN7th Okumikawa Power Trail 11:03:39 h82
2020
19.01 100km JPN30th Miyako 100 km Ultramarathon 9:59:51 h42
2019
08.12 71.7km JPN6th Izu Trail Journey 8:06:18 h78
07.04 70km JPN5th Okumikawa Power Trail 9:54:16 h59
2018
09.12 71.7km JPN5th Izu Trail Journey 9:53:57 h189
22.09 129km JPN5th SkyView Ultra-Trail 120 - Yamada Noboru Memorial Cup 27:10:50 h119
02.09 50km JPN11th OSJ Adatara Trail 50K 10:49:19 h42
23.06 80km JPN4th OSJ Yamanaka Onsen Trail Run 12:50:43 h23
20.05 100km JPN24th Yatsugatake Nobeyama 100 km 9:44:27 h40
22.04 70km JPN4th Okumikawa Power Trail 10:36:08 h48
2017
10.12 71.7km JPN4th Izu Trail Journey 9:04:03 h72
05.11 50km JPN4th Nakanoto Treasure Trail Run Festival 5:44:23 h2 🥈
21.10 54km JPN4th Shigakogen Extreme Trail 8:28:04 h17
15.07 65km JPN8th Nozawa Onsen 4100D Mountain Trail 9:08:15 h18
02.07 100km JPN1st Nikko 100km Ultramarathon 9:54:08 h65
11.06 100km JPN6th Hida Takayama 100 km Ultramarathon 10:00:28 h142
13.05 50km JPN3rd Mt. Hiei Int. 50 km Trail Run 7:35:46 h45
2016
18.12 100km JPN1st Okinawa 100km Ultramarathon 9:51:54 h25
02.10 100km JPN1st Iki 100 km Ultra Marathon 11:03:55 h30
2015
26.07 100km JPN5th North Okhotsk 100 km Marathon 9:53:34 h34
2014
15.06 81.4km JPN1. Spatrail - Shima to Kusatsu 11:16:10 h87
25.04 100mi JPN3rd Ultra-Trail Mt. Fuji 41:40:02 h436
12.01 100km JPN24th Miyako 100 km Ultramarathon 9:35:02 h22
2013
29.09 100km JPN1st 100 km Ultramarathon Hakusan-Shirakawago 10:26:42 h50
09.06 100km JPN9th Iwate Ginga 100km Marathon Challenge 11:46:21 h305
10.03 72km JPN1st Izu Trail Journey 10:55:35 h376
2012
07.10 71.5km JPN20th Hasetsune Cup - Japan Mountain Endurance Race 13:07:05 h423
15.07 100km JPN5th OSJ Ontake 100km Ultra Trail 12:34:25 h142
17.06 100km JPN7. Okinoshima 100km Ultra Marathon 11:44:57 h74
19.05 82km JPN1st Shizuoka to Yamanashi 15:11:44 h116
2011
09.10 71.5km JPN19th Hasetsune Cup - Japan Mountain Endurance Race 12:42:10 h299
07.08 77km JPN18. Ultramarathon Okumusashi 8:04:35 h170
17.07 100km JPN4th OSJ Ontake 100km Ultra Trail 13:34:39 h88
30.04 100km JPN21st Fuji 5 Lakes 100 km Challenge 11:55:46 h316
2010
31.10 45km JPN2nd Shinshu-Togakushi Trail Run Race 5:32:46 h64
10.10 71.5km JPN18th Hasetsune Cup - Japan Mountain Endurance Race 15:49:56 h568
19.09 100km JPN10th Tango 100 km Ultramarathon 10:17:41 h76
2009
11.10 71.5km JPN17th Hasetsune Cup - Japan Mountain Endurance Race 15:17:35 h656
2007
24.06 100km JPN22. Lake Saroma 100 km Ultramarathon 9:51:40 h289
2006
25.06 100km JPN21. Lake Saroma 100 km Ultramarathon 12:24:01 h1136