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BOSTON MARATHON 2023

Dai Won Chang

Bib: 31736•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M65-69)
#0 / 549
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
12:15/mi
38:04
↑ 97↓ 3451.5%
10K· 6.21 mi
12:00/mi
1:15:20
↑ 79↓ 1380.4%
15K· 9.32 mi
12:07/mi
1:52:59
↑ 67↓ 78
20K· 12.43 mi
11:32/mi
2:28:49
↑ 106↓ 860.1%
Half· 13.11 mi
11:51/mi
2:36:54
↑ 19↓ 370.5%
25K· 15.53 mi
12:45/mi
3:07:50
↑ 66↓ 880.2%
30K· 18.64 mi
12:07/mi
3:45:29
↑ 181↓ 1480.2%
20M
11:45/mi
4:01:27
↑ 64↓ 500.2%
21M
13:43/mi
4:15:10
↑ 106↓ 241.6%
35K· 21.75 mi
13:10/mi
4:25:01
↑ 17↓ 861.7%
23M
11:40/mi
4:39:38
↑ 23↓ 630.6%
24M
10:51/mi
4:50:29
↓ 821.3%
40K· 24.85 mi
10:50/mi
4:59:45
↓ 200.3%
25.2M
12:46/mi
5:04:09
↑ 13↓ 160.2%
Finish· 26.22 mi
11:51/mi
5:16:14
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:36:54
Pace11:58 /mi
2nd Half
Distance13.11 mi
Time2:39:20
Pace12:09 /mi
📊Positive Split: 1.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:59:4538:0412:1538:04
12:15
-
10K
6.21 mi12:37:011:15:2012:0737:16
12:00
-0:15
15K
9.32 mi13:14:401:52:5912:0737:39
12:07
+0:07
20K
12.43 mi13:50:302:28:4911:5835:50
11:32
-0:35
Half
13.11 mi13:58:352:36:5411:588:05
11:51
+0:19
25K
15.53 mi14:29:313:07:5012:0530:56
12:45
+0:54
30K
18.64 mi15:07:103:45:2912:0637:39
12:07
-0:38
20M
20.00 mi15:23:084:01:2712:0415:58
11:45
-0:22
21M
21.00 mi15:36:514:15:1012:0913:43
13:43
+1:58
35K
21.75 mi15:46:424:25:0112:119:51
13:10
-0:33
23M
23.00 mi16:01:194:39:3812:0914:37
11:40
-1:30
24M
24.00 mi16:12:104:50:2912:0610:51
10:51
-0:49
40K
24.85 mi16:21:264:59:4512:049:16
10:50
-0:01
25.2M
25.20 mi16:25:505:04:0912:044:24
12:46
+1:56
Finish
26.22 mi16:37:555:16:1412:0412:05
11:51
-0:55

Checkpoints & Pacing

📈Pace Line

Pace Progression

Track your pace changes throughout the race. Dot colors mark your quickest to easiest segments, relative to your own pace.

Fastest Pace

10:50 /mi

Average Pace

12:04 /mi

Slowest Pace

13:43 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

55:57

18% of race

Time at Steady Pace

3:21:23

64% of race

Time at Slower Pace

58:54

19% of race

Average Pace: 12:04 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

🎨Heatmap

Pace Heatmap

Where you sped up and eased off relative to your own pace across the race. Colors are relative to your own range, not to other runners.

Loading...
0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Click or hover over segments to see details

✨Sparklines

Checkpoint Splits with Pace Trends

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi11:59:4538:0412:1538:04
12:15
#26496
10K
6.21 mi12:37:011:15:2012:0737:16
12:00
#26419
15K
9.32 mi13:14:401:52:5912:0737:39
12:07
#26353
20K
12.43 mi13:50:302:28:4911:5835:50
11:32
#26142
Half
13.11 mi13:58:352:36:5411:588:05
11:51
#26125
25K
15.53 mi14:29:313:07:5012:0530:56
12:45
#26077
30K
18.64 mi15:07:103:45:2912:0637:39
12:07
#25863
20M
20.00 mi15:23:084:01:2712:0415:58
11:45
#25761
21M
21.00 mi15:36:514:15:1012:0913:43
13:43
#25718
35K
21.75 mi15:46:424:25:0112:119:51
13:10
#25724
23M
23.00 mi16:01:194:39:3812:0914:37
11:40
#25638
24M
24.00 mi16:12:104:50:2912:0610:51
10:51
#25575
40K
24.85 mi16:21:264:59:4512:049:16
10:50
#25489
25.2M
25.20 mi16:25:505:04:0912:044:24
12:46
#25477
Finish
26.22 mi16:37:555:16:1412:0412:05
11:51
#25467
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM65-69Seg. OverallSeg. MalesSeg. M65-69
5K3.11 mi3.11 mi26496151191511926133(Top 98%)14990(Top 99%)14990(Top 2730%)
10K6.21 mi3.10 mi26419+7715092+2715092+2726273(Top 99%)15037(Top 99%)15037(Top 2739%)
15K9.32 mi3.11 mi26353+6615066+2615066+2626133(Top 98%)14990(Top 99%)14990(Top 2730%)
20K12.43 mi3.11 mi26142+21114993+7314993+7325281(Top 95%)14613(Top 96%)14613(Top 2662%)
Half13.11 mi0.68 mi26125+1714986+714986+725762(Top 97%)14808(Top 98%)14808(Top 2697%)
25K15.53 mi2.42 mi26077+4814967+1914967+1925728(Top 97%)14784(Top 97%)14784(Top 2693%)
30K18.64 mi3.11 mi25863+21414870+9714870+9724622(Top 92%)14248(Top 94%)14248(Top 2595%)
20M20.00 mi1.36 mi25761+10214817+5314817+5323883(Top 90%)13849(Top 91%)13849(Top 2523%)
21M21.00 mi1.00 mi25718+4314795+2214795+2224796(Top 93%)14275(Top 94%)14275(Top 2600%)
35K21.75 mi0.75 mi25724-614794+114794+125686(Top 96%)14676(Top 97%)14676(Top 2673%)
23M23.00 mi1.25 mi25638+8614749+4514749+4523537(Top 88%)13646(Top 90%)13646(Top 2486%)
24M24.00 mi1.00 mi25575+6314716+3314716+3322756(Top 85%)13233(Top 87%)13233(Top 2410%)
40K24.85 mi0.85 mi25489+8614671+4514671+4522016(Top 83%)12839(Top 85%)12839(Top 2339%)
25.2M25.20 mi0.35 mi25477+1214666+514666+523661(Top 89%)13631(Top 90%)13631(Top 2483%)
Finish26.22 mi1.02 mi25467+1014655+1114655+1125107(Top 94%)14369(Top 95%)14369(Top 2617%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 98%
×21story building
+97ft-345ft

Overall

26133

Males

14990

M65-69

14990

5K→10K

3.1 - 6.2 mi

Top 99%
×5story building
+79ft-138ft

Overall

26273

Males

15037

M65-69

15037

10K→15K

6.2 - 9.3 mi

Top 98%
×3story building
+67ft-78ft

Overall

26133

Males

14990

M65-69

14990

15K→20K

9.3 - 12.4 mi

Top 95%
×5story building
+106ft-86ft

Overall

25281

Males

14613

M65-69

14613

20K→Half

12.4 - 13.1 mi

Top 97%
×2story building
+19ft-37ft

Overall

25762

Males

14808

M65-69

14808

Half→25K

13.1 - 15.5 mi

Top 97%
×4story building
+66ft-88ft

Overall

25728

Males

14784

M65-69

14784

25K→30K

15.5 - 18.6 mi

Top 92%
×9story building
+181ft-148ft

Overall

24622

Males

14248

M65-69

14248

30K→20M

18.6 - 20.0 mi

Top 90%
×5story building
+64ft-50ft

Overall

23883

Males

13849

M65-69

13849

20M→21M

20.0 - 21.0 mi

Top 93%
×8story building
+106ft-24ft

Overall

24796

Males

14275

M65-69

14275

21M→35K

21.0 - 21.8 mi

Top 96%
×7story building
+17ft-86ft

Overall

25686

Males

14676

M65-69

14676

35K→23M

21.8 - 23.0 mi

Top 88%
×5story building
+23ft-63ft

Overall

23537

Males

13646

M65-69

13646

23M→24M

23.0 - 24.0 mi

Top 85%
×6story building
+12ft-82ft

Overall

22756

Males

13233

M65-69

13233

24M→40K

24.0 - 24.9 mi

Top 83%
×1story
+6ft-20ft

Overall

22016

Males

12839

M65-69

12839

40K→25.2M

24.9 - 25.2 mi

Top 89%
×1story
+13ft-16ft

Overall

23661

Males

13631

M65-69

13631

25.2M→Finish

25.2 - 26.2 mi

Top 94%
×2story building
+22ft-21ft

Overall

25107

Males

14369

M65-69

14369

Passing Analysis

Category:
Athletes Passed
1107
Passed By
78
Net Change
+1029
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#26496
5K → 10K8710+77#26496#26419
10K → 15K737+66#26419#26353
15K → 20K2110+211#26353#26142
20K → Half203+17#26142#26125
Half → 25K6517+48#26125#26077
25K → 30K2162+214#26077#25863
30K → 20M1020+102#25863#25761
20M → 21M518+43#25761#25718
21M → 35K1016-6#25718#25724
35K → 23M871+86#25724#25638
23M → 24M630+63#25638#25575
24M → 40K871+86#25575#25489
40K → 25.2M131+12#25489#25477
25.2M → Finish2212+10#25477#25467
TOTALS110778+1029
📊

Passing Visuals

Category:
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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing