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| Name: | Arai, Koji | 新居耕治 |
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| Club: | |||
| Residence: | Tokyo | ||
| Year of birth: | 1966 | (Cat. german: M60) | |
| Date of birth: | 19.12.1966 | (Cat. internat.: M55) | |
| Nationality: | JPN  |
Japan | |
| RunnerID: | 544039 | ||
41 search results (41 Events, 4156.168 km). (More)
| 2025 | 5 Events, 661.934 km (More) | ||||
|---|---|---|---|---|---|
| 28.-30.12.2025 | Kyoto Great Round 130 km (JPN) | 130km | |||
| 29:21:57 h | Arai, Koji | Overall: 110 | M: 99 | Cat M55: 8 | |
| 12.-13.10.2025 | OSJ Koumi 100 (JPN) | 100mi | |||
| 34:14:52 h | Arai, Koji | *Tokyo | Overall: 87 | M: 80 | Cat M55: 4 |
| 30.05.-01.06.2025 | Tokyo Grand Trail - 100mi (JPN) | 160km | |||
| 46:39:38 h | Arai, Koji | Overall: 59 | M: 51 | Cat M55: 9 | |
| 11.05.2025 | FunTrails Round Minano (JPN) | 51km | |||
| 8:27:32 h | Arai, Koji | *Tokyo | Overall: 172 | M: 154 | Cat M55: 12 |
| 12.-13.04.2025 | Tokai Peninsura Giant Trail 100 (JPN) | 160km | |||
| 34:41:53 h | Arai, Koji | Overall: 42 | M: 35 | Cat M55: 5 | |
| 2024 | 4 Events, 441 km (More) | ||||
| 29.-30.12.2024 | Kyoto Great Round 130 km (JPN) | 130km | |||
| 30:26:34 h | Arai, Koji | Overall: 114 | M: 104 | Cat M55: 6 | |
| 16.-17.11.2024 | FunTrails100K Round (JPN) | 100km | |||
| 24:41:51 h | Arai, Koji | *Tokyo | Overall: 117 | M: 102 | Cat M55: 4 |
| 24.-26.05.2024 | Tokyo Grand Trail - 100mi (JPN) | 160km | |||
| 43:47:34 h | Arai, Koji | Overall: 40 | M: 32 | Cat M55: 4 | |
| 12.05.2024 | FunTrails Round Minano (JPN) | 51km | |||
| 7:50:16 h | Arai, Koji | *Tokyo | Overall: 111 | M: 105 | Cat M55: 7 |
| 2023 | 6 Events, 687.4 km (More) | ||||
| 29.-30.12.2023 | Kyoto Great Round 130 km (JPN) | 130km | |||
| 29:30:00 h | Arai, Koji | Overall: 60 | M: 53 | Cat M55: 4 | |
| 05.11.2023 | Koshu Alps Haute Route Challenge (JPN) | 68km | |||
| 14:21:39 h | Arai, Koji | Overall: 92 | M: 86 | Cat M55: 9 | |
| 06.-08.10.2023 | Lake Biwa 100 (JPN) | 169km | |||
| 2d 01:06:49 h | Arai, Koji | Overall: 203 | M: 168 | Cat M55: 13 | |
| 03.09.2023 | OSJ Adatara Trail 50K (JPN) | 53.4km | |||
| 12:17:12 h | Arai, Koji | Overall: 94 | M: 82 | Cat M55: 6 | |
| 08.-09.07.2023 | Shiga Kogen 100 (JPN) | 100km | |||
| 23:22:20 h | Arai, Koji | *Tokyo | Overall: 224 | M: 191 | Cat M55: 19 |
| 21.-23.04.2023 | Ultra-Trail Mt. Fuji (UTMF) (JPN) | 167km | |||
| 41:52:17 h | Arai, Koji | *Tokyo | Overall: 1253 | M: 1110 | Cat M55: 88 |
| 2022 | 5 Events, 462.4 km (More) | ||||
| 29.-30.12.2022 | Kyoto Great Round 130 km (JPN) | 130km | |||
| 30:47:32 h | Arai, Koji | Overall: 92 | M: 81 | Cat M55: 10 | |
| 07.-09.10.2022 | Lake Biwa 100 (JPN) | 169km | |||
| 2d 03:50:37 h | Arai, Koji | Overall: 174 | M: 151 | Cat M55: 10 | |
| 04.09.2022 | OSJ Adatara Trail 50K (JPN) | 53.4km | |||
| 11:29:24 h | Arai, Koji | Overall: 140 | M: 129 | Cat M55: 6 | |
| 17.-18.07.2022 | Nozawa Onsen 4100D Mountain Trail (JPN) | 65km | |||
| 13:07:27 h | Arai, Koji | *Tokyo | Overall: 272 | M: 235 | Cat M55: 16 |
| 27.05.2022 | Karuizawa Trail Running Race (JPN) | 45km | |||
| 8:45:09 h | Arai, Koji | *Tokyo | Overall: 276 | M: 241 | Cat M55: 24 |
| 2020 | 1 Event, 100 km (More) | ||||
| 05.-06.09.2020 | Trail Mt Wugong 100 Km (CHN) | 100km | |||
| 25:47:45 h | Arai, Koji | Overall: 44 | M: 38 | Cat M50: 5 | |
| 2019 | 2 Events, 150 km (More) | ||||
| 14.-15.09.2019 | Huanglong Extreme Endunrance Race - Uthl 100 (CHN) | 100km | |||
| 30:24:02 h | Arai, Koji | Overall: 38 | M: 33 | Cat M50: 2 | |
| 29.06.2019 | Phoenix Ridge Night Raid (CHN) | 50km | |||
| 12:30:30 h | Arai, Koji | Overall: 85 | M: 70 | Cat M50: 3 | |
| 2018 | 1 Event, 160.934 km (More) | ||||
| 09.-11.03.2018 | Mt. Gaoligong Ultra 100 Miles (CHN) | 100mi | |||
| 41:00:09 h | Arai, Koji | Overall: 169 | M: 146 | Cat M50: 10 | |
| 2017 | 6 Events, 568 km (More) | ||||
| 11.-13.08.2017 | Chongli 100 Ultra Sky Trail Challenge (CHN) | 168km | |||
| 40:53:50 h | Arai, Koji | Overall: 15 | M: 15 | Cat M50: 2 | |
| 15.07.2017 | Transqilian Run 108km (CHN) | 108km | |||
| 23:40:53 h | Arai, Koji | Overall: 36 | M: 27 | Cat M50: 3 | |
| 20.-21.05.2017 | Shangri-La Meili 100 Km (CHN) | 100km | |||
| 27:50:19 h | Arai, Koji | Overall: 21 | M: 19 | Cat M50: 2 | |
| 02.05.2017 | Yading Kora Ultra (CHN) | 46km | |||
| 13:46:24 h | Arai, Koji | Overall: 82 | M: 64 | Cat M50: 5 | |
| 09.04.2017 | Jingxigudao Cyclo Cross (CHN) | 46km | |||
| 8:35:10 h | Arai, Koji | Overall: 12 | M: 12 | Cat M50: 1 | |
| 18.-19.03.2017 | Hangzhou 100 Ultra Trail Race (CHN) | 100km | |||
| 28:14:41 h | Arai, Koji | Overall: 53 | M: 49 | Cat M50: 5 | |
| 2016 | 2 Events, 148 km (More) | ||||
| 15.08.2016 | Chongli 100 Ultra Sky Trail Challenge - 100 Km Run (CHN) | 100km | |||
| 24:17:31 h | Arai, Koji | Overall: 119 | M: 106 | Cat M45: 10 | |
| 18.06.2016 | Aijiangshan Trail Series - Lingshan (CHN) | 48km | |||
| 10:58:07 h | Arai, Koji | Overall: 39 | M: 32 | Cat M45: 6 | |
| 2015 | 5 Events, 418.5 km (More) | ||||
| 31.10.-01.11.2015 | Hasetsune Cup - Japan Mountain Endurance Race (JPN) | 71.5km | |||
| 14:10:43 h | Arai, Koji | Overall: 740 | M: 697 | Cat M45: 119 | |
| 19.-20.07.2015 | SkyView Ultra-Trail - Yamada Noboru Memorial Cup (JPN) | 118km | |||
| 28:45:54 h | Arai, Koji | *Tokyo | Overall: 161 | M: 153 | Cat M45: 29 |
| 04.07.2015 | Utsukushigahara 80 Km Trail Run (JPN) | 80km | |||
| 14:14:51 h | Arai, Koji | Overall: 266 | M: 245 | Cat M45: 31 | |
| 22.06.2015 | Ultramarathon Okumusashi (JPN) | 77km | |||
| 9:13:08 h | Arai, Koji | *Tokyo | Overall: 589 | M: 515 | Cat M45: 99 |
| 15.03.2015 | Izu Trail Journey (JPN) | 72km | |||
| 12:06:59 h | Arai, Koji | *Tokyo | Overall: 552 | M: 506 | Cat M45: 91 |
| 2014 | 3 Events, 308 km (More) | ||||
| 20.-21.09.2014 | SkyView Ultra-Trail - Yamada Noboru Memorial Cup (JPN) | 120km | |||
| 30:19:45 h | Arai, Koji | Overall: 318 | M: 304 | Cat M45: 51 | |
| 01.06.2014 | Tokyo Shibamata 100 km (JPN) | 100km | |||
| 13:42:47 h | Arai, Koji | Overall: 501 | M: 475 | Cat M45: 73 | |
| 26.-27.04.2014 | Shizuoka to Yamanashi (STY) (JPN) | 88km | |||
| 22:40:21 h | Arai, Koji | *Tokyo | Overall: 574 | M: 503 | Cat M45: 97 |
| 2013 | 1 Event, 50 km (More) | ||||
| 29.09.2013 | SkyView Ultra-Trail (JPN) | 50km | |||
| 9:40:17 h | Arai, Koji | *Tokyo | Overall: 224 | M: 202 | Cat M45: 30 |
Personal bests
Your list of personal best performances only contains performances of races which can be included into rankings.
In brackets rank in yearly international/national rankings.
| PB | 2025 | 2024 | 2023 | 2022 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | |
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| 100km | 13:42:47 |
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13:42:47
(8383/3781) |
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Comparison table
Comparison of performances in races with multiple participations
| 2025 | 2024 | 2023 | 2022 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kyoto Great Round 130 km | 4 | 29:21:57 | 30:26:34 | 29:30:00 | 30:47:32 | ||||||||
| Tokyo Grand Trail - 100mi | 2 | 46:39:38 | 43:47:34 | ||||||||||
| FunTrails Round Minano | 2 | 8:27:32 | 7:50:16 | ||||||||||
| Lake Biwa 100 | 2 | 49:06:49 | 51:50:37 | ||||||||||
| SkyView Ultra-Trail - Yamada Noboru Memorial Cup | 2 | 28:45:54 | 30:19:45 | ||||||||||
| OSJ Adatara Trail 50K | 2 | 12:17:12 | 11:29:24 |