Koshiro (中原宏史郎) Nakahara
ID 620175
Born : 1986 Cat. M40 Ultrarunner since 2014 JPN
25
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
40
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
27,1%
Rank quotient ?This runner's calculation uses 25 eligible race(s): Σ(rank − 1) = 2 702; Σ finishers = 9 961. 2 702 / 9 961 × 100 = 27.13%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed25
Km — ultra races2 139 km
> 100 km10
> 160 km2
Longest race167,0 km
7th Ultra-Trail Mt. Fuji (UTMF) — 22/4/2022

Km per year (ultra races)

334
3 races
2022
341
4 races
2023
282
3 races
2024
332
4 races
2025
160
2 races
2026

Race types (share of distance)

Road4,7%
Trail95,3%

Records

50 km12h27'45100 km12h56'16100 mi35h06'46

HISTORY

25 race(s)
DateRacePerf.Rk
2026
09.05 114km JPN4th Aso Volcano Trail 19:38:45 h83
15.02 46km JPN3rd Nagasaki Round Trail 7:01:11 h6
2025
15.11 101km JPN4th Kumagawa Revival Trail 16:33:59 h10
03.08 63.5km JPN5th Kyushu Sekiryou Piston trail 11:42:14 h18
10.05 115.1km JPN3rd Aso Volcano Trail 16:48:19 h41
06.04 52km JPN10th Tara Forest Trail 7:52:03 h16
2024
16.11 101km JPN3rd Kumagawa Revival Trail 17:47:30 h11
21.07 66km JPN12th Kirishima Ebino-kougen Extreme Trail 9:23:54 h15
11.05 115.1km JPN2nd Aso Volcano Trail 17:55:44 h36
2023
18.11 106km JPN9th FunTrails100K Round 21:23:57 h70
03.09 64km JPN6th Mizukami Mountain Party 10:45:09 h25
23.07 66km JPN11th Kirishima Ebino-kougen Extreme Trail 9:27:51 h47
13.05 105km JPN1st Aso Volcano Trail 22:10:41 h31
2022
24.09 107km JPN1st Hiroshima Wangan Trail Run 22:53:32 h99
24.07 60km JPN10th Kirishima Ebino-kougen Extreme Trail 9:13:36 h27
22.04 167km JPN7th Ultra-Trail Mt. Fuji 29:20:08 h233
2021
25.07 60km JPN9th Kirishima Ebino-kougen Extreme Trail 8:45:51 h22
14.03 62km JPN4th Mizukami Mountain Party 9:22:46 h25
2020
10.10 100mi JPN6th OSJ Koumi 100 35:06:46 h89
2019
21.09 75km JPN6th SkyView Ultra-Trail 70 - Yamada Noboru Memorial Cup 15:36:45 h122
16.06 48.3km JPN1st FunTrails Round Minano 9:40:45 h103
2018
07.10 71.5km JPN26th Hasetsune Cup - Japan Mountain Endurance Race 16:34:40 h526
02.06 50km JPN10th OSJ Okukuji Trail 50k 12:27:45 h144
2015
21.07 63km JPN3rd Kirishima Ebino-kougen Extreme Trail 12:20:15 h190
2014
19.10 100km JPN20th River Shimanto 100km 12:56:16 h738