Ryoji (大井良次) Oi
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Born : 1976
Cat. M50 Ultrarunner since 2015
10
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
28
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 ?Japan
Japan56,7%
Rank quotient ?This runner's calculation uses 10 eligible race(s): Σ(rank − 1) = 2 018; Σ finishers = 3 556. 2 018 / 3 556 × 100 = 56.75%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed10
Km — ultra races1 000 km
> 100 km4
> 160 km2
Longest race169,0 km
5th Lake Biwa 100 — 10/10/2025
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road11,2%
Trail88,8%
HISTORY
10 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2025 | ||||
| 10.10 | 169km | 5th Lake Biwa 100 |
45:36:45 h | 142 |
| 15.03 | 50km | 11th Mt. Hiei Int. 50 km Trail Run |
8:53:07 h | 177 |
| 2024 | ||||
| 02.11 | 100km | 4th OSJ Kami 100 |
21:37:53 h | 64 |
| 2023 | ||||
| 16.09 | 162.6km | 15th Shinetsu Five Mountains Trail 100 mile |
30:57:56 h | 122 |
| 2021 | ||||
| 06.11 | 100km | 1st OSJ Kami 100 |
21:15:03 h | 133 |
| 2019 | ||||
| 11.05 | 121km | 3rd Aso Round Trail |
27:03:00 h | 170 |
| 2017 | ||||
| 13.05 | 108.7km | 1st Aso Round Trail |
26:21:16 h | 126 |
| 2015 | ||||
| 18.10 | 56km | 13th Mt. Rocco Cannonball Run - 56 km Speed |
9:48:16 h | 229 |
| 26.09 | 76.7km | 4th Shizuoka to Yamanashi |
18:41:24 h | 622 |
| 29.03 | 56km | 12th Mt. Rocco Cannonball Run - 56 km Speed |
9:41:10 h | 243 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 10/10/2025 | 5th Lake Biwa 100 | 169,00 | ×6 |
| ✓ 2 | 16/9/2023 | 15th Shinetsu Five Mountains Trail 100 mile | 162,60 | ×5 |
| ✓ 3 | 11/5/2019 | 3rd Aso Round Trail | 121,00 | ×4 |
| ✓ 4 | 13/5/2017 | 1st Aso Round Trail | 108,70 | ×3 |
| ✓ 5 | 2/11/2024 | 4th OSJ Kami 100 | 100,00 | ×3 |
| ✓ 6 | 6/11/2021 | 1st OSJ Kami 100 | 100,00 | ×3 |
| ✓ 7 | 26/9/2015 | 4th Shizuoka to Yamanashi (STY) | 76,70 | ×2 |
| ✓ 8 | 18/10/2015 | 13th Mt. Rocco Cannonball Run - 56 km Speed | 56,00 | ×2 |
| ✓ 9 | 29/3/2015 | 12th Mt. Rocco Cannonball Run - 56 km Speed | 56,00 | ×2 |
| ✓ 10 | 15/3/2025 | 11th Mt. Hiei Int. 50 km Trail Run | 50,00 | ×1 |