Bruce John Grierson
ID 46978
Born : 1969 Cat. M55 Ultrarunner since 1990 RSA
42
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
46
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 ?RSASouth Africa
74,4%
Rank quotient ?This runner's calculation uses 42 eligible race(s): Σ(rank − 1) = 172 442; Σ finishers = 231 693. 172 442 / 231 693 × 100 = 74.43%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed42
Km — ultra races2 925 km
> 100 km2
> 160 km2
Longest race160,9 km
13th Midlands 100 Miler — 27/8/2010

Km per year (ultra races)

142
2 races
2022
52
1 race
2023
87
1 race
2024
90
1 race
2025
86
1 race
2026

Race types (share of distance)

Road73,7%
Trail26,3%

Records

50 km5h12'43100 mi25h50'0312 h83,02 km

HISTORY

42 race(s) · 1 split(s) nested
DateRacePerf.Rk
2026
14.06 86km RSA99th Comrades Marathon - Up Run 11:58:09 h18151
2025
08.06 90km RSA98th Comrades Marathon - Down Run 11:56:50 h17593
2024
09.06 87km RSA97th Comrades Marathon - Up Run 11:59:18 h17250
2023
08.07 52km RSA33th Rhodes 52 km Trail Run 7:04:22 h116
2022
28.08 90km RSA95th Comrades Marathon - Down Run 11:54:28 h11291
09.07 52km RSA32th Rhodes 52 km Trail Run 8:19:05 h86
2019
09.06 87km RSA94th Comrades Marathon - Up Run 11:49:25 h14626
2017
08.07 52km RSA29th Rhodes 52 km Trail Run 8:32:24 h162
2016
09.07 52km RSA28th Rhodes 52 km Trail Run 8:43:31 h217
2015
11.07 52km RSA27th Rhodes 52 km Trail Run 8:46:55 h238
31.05 87km RSA90th Comrades Marathon - Up Run 11:59:30 h12693
2014
12.07 52km RSA26th Rhodes 52 km Trail Run 8:46:45 h224
27.04 52km RSA4th Chatsworth Freedom Ultramarathon 52 km 6:05:54 h826
2013
06.07 52km RSA25th Rhodes 52 km Trail Run 8:03:08 h157
02.06 87km road race RSA88th Comrades Marathon - Up Run 11:56:14 h9682
2012
08.09 50km RSA20. Mont-Aux-Sources 50km Challenge 5:24:28 h142
03.06 89km road race RSA87th Comrades Marathon - Down Run 10:56:58 h7865
07.04 56km road race RSA43rd Two Oceans Marathon 5:56:39 h4263
2011
16.07 52km RSA23rd Rhodes 52 km Trail Run 8:50:55 h228
2010
12.09 50km RSADolphin Coast Striders Ultra 5:43:48 h64
27.08 100mi RSA13th Midlands 100 Miler 25:55:27 h56
31.07 12h RSA15th Longest Day 12 Hour Track Race 83.020 km33
03.07 52km RSA22nd Rhodes 52 km Trail Run 8:08:47 h151
2009
01.08 12h RSA14th Longest Day 12 Hour Track Race 71.600 km70
2008
15.08 100mi RSA11th Midlands 100 Miler 25:50:03 h25
26.07 12h RSA13th Longest Day 12 Hour Track Race 82.000 km55
2006
09.09 50km RSA14. Mont-Aux-Sources 50km Challenge 8:36:43 h163
2005
10.09 50km RSA13. Mont-Aux-Sources 50km Challenge 7:59:43 h113
26.03 56km road race RSA36th Two Oceans Marathon 5:57:48 h4529
2004
11.09 50km RSA12. Mont-Aux-Sources 50km Challenge 8:20:08 h133
16.06 87km road race RSA79th Comrades Marathon - Up Run 10:27:36 h5488
10.04 56km road race RSA35th Two Oceans Marathon 5:10:17 h2224
2003
13.09 50km RSA11. Mont-Aux-Sources 50km Challenge 8:05:06 h141
16.06 89km road race RSA78th Comrades Marathon - Down Run 9:59:21 h5284
19.04 56km road race RSA34th Two Oceans Marathon 5:19:15 h2083
2001
01.09 50km RSA9. Mont-Aux-Sources 50km Challenge 7:57:29 h195
16.06 89km road race RSA76th Comrades Marathon - Down Run 10:40:22 h8405
14.04 56km RSA32rd Two Oceans Marathon 5:16:58 h2206
2000
16.06 87km road race RSA75th Comrades Marathon - Up Run 10:56:58 h12423
22.04 56km RSA31st Two Oceans Marathon 5:51:39 h5344
18.03 50km RSA10th Om Die Dam 50km 5:12:43 h2187
1990
14.04 56km RSA21st Two Oceans Marathon 5:39:31 h5302