Ryuta (岩井竜太) Iwai
Born : 1993 Cat. M23 Ultrarunner since 2016 JPN
25
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
35
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
4
Countries visited ?HKGHong KongITAItalyJPNJapanKORSouth Korea
2,8%
Rank quotient ?This runner's calculation uses 25 eligible race(s): Σ(rank − 1) = 472; Σ finishers = 16 746. 472 / 16 746 × 100 = 2.82%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed25
Km — ultra races1 729 km
> 100 km3
Longest race109,2 km

Km per year (ultra races)

264
4 races
2022
351
4 races
2023
189
3 races
2024
240
4 races
2025
229
3 races
2026

Race types (share of distance)

Trail100,0%

Wins & podiums (ultra)

🏆 Win2
🏆 Win M2
🏅 Top 38
🏅 Top 3 M8
Longest winning streak1
Current streak0

HISTORY

25 race(s)
DateRacePerf.Rk
2026
28.08 101km ITA20ème Courmayeur-Champex-Chamonix 15:57:15 h197
20.06 58km JPN2nd Kaga Spa by UTMB - Kaga Spa Trail Endurance 50 6:07:22 h7
25.04 70km JPN5th KAI 70k 7:38:55 h14
2025
15.11 80km HKG12th TransLantau 80 by UTMB 9:31:06 h3 🥉
02.11 49km JPN2nd Sea Alps Trail Journey 4:40:22 h2 🥈
07.09 53.4km JPN18th OSJ Adatara Trail 50K 7:28:37 h1 🏆
21.06 58km JPN1st Kaga Spa by UTMB - Kaga Spa Trail Endurance 50 7:06:29 h13
2024
13.10 71.5km JPN32th Hasetsune Cup - Japan Mountain Endurance Race 8:42:32 h18
07.09 53.4km JPN17th OSJ Adatara Trail 50K 7:25:35 h2 🥈
24.03 64km JPN10th OSJ Shinshiro Trail 64K 8:53:01 h2 🥈
2023
18.11 106km JPN9th FunTrails100K Round 14:38:03 h3 🥉
08.10 71.5km JPN31th Hasetsune Cup - Japan Mountain Endurance Race 8:01:45 h6
20.05 109.2km JPN8th Trainic World 100 km in Sai-No-Kuni 16:08:23 h1 🏆
25.03 64km JPN9th OSJ Shinshiro Trail 64K 9:38:52 h2 🥈
2022
11.12 70km JPN9th Izu Trail Journey 6:53:45 h16
09.10 71.5km JPN30th Hasetsune Cup - Japan Mountain Endurance Race 8:36:51 h12
12.06 53km JPN4th Yuzawa Sky Extreme Trail 6:28:49 h4
23.04 69km JPN1st KAI 69k 9:30:26 h11
2021
12.12 69.1km JPN8th Izu Trail Journey 6:55:45 h15
2019
19.10 50km KOR1st K100 Maple Trail 6:14:52 h6
2017
21.10 54km JPN4th Shigakogen Extreme Trail 7:31:02 h11
08.10 71.5km JPN25th Hasetsune Cup - Japan Mountain Endurance Race 10:43:17 h73
01.07 80km JPN7th Utsukushigahara 80 km Trail Run 8:08:32 h22
2016
19.11 52km JPN2nd FunTrails50K Two Lakes&Green line 7:32:11 h39
02.07 80km JPN6th Utsukushigahara 80 km Trail Run 10:18:34 h17