| Event | 2015 Brooks Snowdonia - Marathon |
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| Name | Gwion Williams | Club | ERYRI HARRIERS | Race Number | 1857 | Date | 24/10/2015 |
| Gender | Male | Gender Position | 208 of 1386 | Category | M40+ | Category Position | 58 of 309 |
| Pen y Pass | 00:38:18 | Stage Position | 330 |
| Halfway | 01:39:36 | Stage Position | 168 |
| 23 Miles | 03:04:19 | Stage Position | 257 |
| Gun Time | 03:33:13 | Overall Position | 216 |
| Chip Time | 03:33:04 | Chip Position | 223 |