Jing-Feng (许京锋) Xu
ID 837101
Born : 1977 Cat. M45 Ultrarunner since 2016 CHN
10
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
33
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
2
Countries visited ?CHNChinaTHAThailand
23,7%
Rank quotient ?This runner's calculation uses 10 eligible race(s): Σ(rank − 1) = 137; Σ finishers = 577. 137 / 577 × 100 = 23.74%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed10
Km — ultra races1 312 km
> 100 km5
> 160 km3
> 200 km1
> 24h4
Longest race237,1 km
Strait 24 Hours Int. Ultramarathon — 29/10/2016

Km per year (ultra races)

2022
2023
2024
154
1 race
2025
2026

Race types (share of distance)

Road95,4%
Trail4,6%

Wins & podiums (ultra)

🏆 Win0
🏆 Win M0
🏅 Top 32
🏅 Top 3 M2
Longest winning streak0
Current streak0

Records

100 km9h08'1612 h127,65 km24 h237,11 km

HISTORY

10 race(s) · 6 split(s) nested
DateRacePerf.Rk
2025
27.09 24h THA1st Chiangmai 24 Hr Challenge 153.672 km23
2019
23.08 12h CHN1st Xiamen 12 Hour Race 68.000 km10
2018
26.10 100km CHN1st Changan Ford Ultra Challenge 100km 9:08:16 h23
06.01 60km CHN1st Maoming Dianbai 60km Trail Race 10:22:26 h13
2017
09.12 24h CHN1st Hangzhou ultramarathon 24H race 166.800 km35
21.10 24h CHN2nd Strait 24 Hours Int. Ultramarathon 199.200 km8
30.09 100km CHNFuxian Lake Highland Ultramarathon 100K 10:12:12 h24
2016
10.12 100km CHN1st Foshan Ultra Marathon 100km 9:57:28 h7
29.10 24h CHNStrait 24 Hours Int. Ultramarathon 237.110 km2 🥈
18.06 12h CHN1st Mount Xiqiao Int. 12 Hour Ultra Marathon 127.653 km2 🥈