Jae-Byung Jung
ID 192502
Born : 1970 Cat. M55 Ultrarunner since 2009 USA
50
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
50
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 ?USAUnited States
42,5%
Rank quotient ?This runner's calculation uses 51 eligible race(s): Σ(rank − 1) = 815; Σ finishers = 1 919. 815 / 1 919 × 100 = 42.47%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed51
Km — ultra races3 935 km
> 100 km7
> 160 km2
> 24h6
Longest race163,2 km
11th Hamster Endurance Runs 32 Hour Run — 3/8/2024

Km per year (ultra races)

383
4 races
2022
525
6 races
2023
852
8 races
2024
567
7 races
2025
329
4 races
2026

Race types (share of distance)

Road41,7%
Trail58,3%

Wins & podiums (ultra)

🏆 Win1
🏆 Win M2
🏅 Top 38
🏅 Top 3 M12
Longest winning streak1
Current streak0

Records

50 km4h52'15100 km16h28'0050 mi8h45'22100 mi27h25'5812 h97,85 km24 h156,11 km

HISTORY

51 race(s)
DateRacePerf.Rk
2026
15.08 18h USA2nd One Step Closer 131.000 km3 🥉
09.05 50km USA23rd Pigtails Run 50K 5:12:15 h14
28.03 12h USA16th Dizzy Daze 12 Hour Race 97.848 km7
08.02 50km USA5th West Seattle Beach Run - Fat Ass 5:35:30 h1 🏆
2025
08.11 50mi USA4th Willapa Trail Festival 50 Miles Race 9:13:00 h8
04.10 50km USA24th Baker Lake 50K Ultra Trail Run 7:16:12 h52
02.08 32h USA12th Hamster Endurance Runs 32 Hour Run 66.948 km28
24.05 13h USA14th Sri Chinmoy 13 Hour Race 101.613 km2 🥈
04.05 50mi USA41st Mt. Si 50 Miles Ultra Run 9:25:03 h10
12.04 12h USA3rd Jill's Twelve Hour Run 90.123 km2 🥈
29.03 12h USA15th Dizzy Daze 12 Hour Race 97.848 km2 🥈
2024
21.09 100mi USA6th The Cascade Super 100mi Ultra Race 27:25:58 h22
03.08 32h USA11th Hamster Endurance Runs 32 Hour Run 163.187 km5
08.06 12h USA1st Lake Tye Challenge - 12h 92.939 km6
25.05 13h USA13th Sri Chinmoy 13 Hour Race 96.657 km4
21.04 50mi USA40th Mt. Si 50 Miles Ultra Run 9:58:34 h14
30.03 12h USA14th Dizzy Daze 12 Hour Race 51.499 km35
23.03 24h USA22th Pacific Rim One Day 156.106 km3 🥉
10.02 50km USA2nd BURT 50 7:44:23 h13
2023
23.09 50mi USA5th The Cascade Super 50mi Ultra Race 10:52:15 h62
12.08 24h USA10th Hamster Endurance Runs 24 Hour Run 83.685 km17
23.04 50mi USA39th Mt. Si 50 Miles Ultra Run 9:50:32 h16
15.04 12h USA10th Cottontail 12 Hour Race 74.544 km2 🥈
25.03 24h USA21th Pacific Rim One Day 112.654 km15
11.03 12h USA13th Dizzy Daze 12 Hour Race 92.698 km4
2022
01.10 50km USA21st Baker Lake 50K Ultra Trail Run 6:04:04 h24
24.04 50mi USA38th Mt. Si 50 Miles Ultra Run 8:45:22 h8
26.03 12h USA12th Dizzy Daze 12 hours 97.848 km5
19.03 24h USA20th Pacific Rim One Day 154.497 km8
2021
02.10 50km USA20th Baker Lake 50K Ultra Trail Run 6:38:07 h54
05.09 13h USA10th Sri Chinmoy 13 Hour Race 96.657 km2 🥈
31.07 50mi USA29th White River 50 Mile Endurance Run 13:23:25 h51
2015
15.02 50km USAFishline 50K Run 6:43:35 h8
31.01 50km USA1st West Seattle Beach Run - Winter Edition 5:33:00 h11
2014
01.11 12h USA8th Carkeek 12 Hour 71.438 km10
02.08 50km USA5th Grand Ridge 50 km Trail Run 7:34:39 h7
15.06 28.8mi USA8th Lake Youngs Ultra 4:56:44 h10
20.04 50km USA4th Yakima Skyline Rim 50k 9:14:47 h99
2011
14.08 12h USA2nd Transcendence 12 Hour Ultra Run 53.954 km62
18.06 50km USA1st Taylor Mountain 50 km Trail Run 6:13:51 h7
16.04 100km USA2nd Lumberjack Endurance 100 km Run 16:28:00 h9
19.02 50km USA2nd Woolley Trail Runs 50k 4:52:15 h11
13.02 50km USAFishline 50K Run 5:20:08 h5
08.01 50km USA16th Bridle Trails Winter Running Festival 5:27:17 h26
2010
06.11 50km USA15th Ron Herzog 50K 7:25:30 h33
05.09 50km USA2nd Roots Rock 50K Run 5:36:23 h6
11.04 50mi USA27th Mt. Si 50 Miles Ultra Run 8:53:42 h21
14.02 50km USAFishline 50K Run 5:37:04 h8
23.01 50km USA7th Pigtails Run 50K 4:57:39 h19
2009
06.09 50km USA1st Roots Rock 50K Run 5:35:51 h4
20.06 50km USA3rd The 20th Century 50K Trail Run 5:21:44 h11