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BOSTON MARATHON 2023

Tzu Wen Chang

Bib: 11847 M

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Top 35%
Gender (Male)
#0 / 15176
Top 49%
Masters (Masters Men)
#0 / 9891
Top 38%
Division (M50-54)
#0 / 2052
Top 36%
Race Day Weather
49°/39°F
light intensity drizzle

Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
7:30/mi
23:17
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
7:11/mi
45:36
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
7:14/mi
1:08:04
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
7:24/mi
1:31:04
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
7:23/mi
1:36:06
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
7:32/mi
1:54:23
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
7:51/mi
2:18:45
↑ 181↓ 1480.2%
138 ft elev
20M
7:33/mi
2:29:01
↑ 64↓ 500.2%
148 ft elev
21M
8:53/mi
2:37:54
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
7:53/mi
2:43:48
↑ 17↓ 861.7%
156 ft elev
23M
7:46/mi
2:53:32
↑ 23↓ 630.6%
116 ft elev
24M
8:02/mi
3:01:34
↓ 821.3%
34 ft elev
40K· 24.85 mi
8:26/mi
3:08:47
↓ 200.3%
20 ft elev
25.2M
9:08/mi
3:11:56
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
8:11/mi
3:20:16
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Half Splits

1st Half· via Half
1:36:067:20 /mi⚡ faster
2nd Half
1:44:107:57 /mi+8.4%
Positive split — 8.4% slower in the second half
Is this your race?

Your race, unpacked

See your splits, ranks & AI insights.

Checkpoint Splits

CheckpointTimeAvg PaceSegment LengthSegment TimeSegment PaceTrendDiff
5K
23:177:303.11 mi23:17
7:30
-
10K
45:367:203.10 mi22:19
7:11
-0:19
15K
1:08:047:183.11 mi22:28
7:14
+0:03
20K
1:31:047:203.11 mi23:00
7:24
+0:10
Half(13.11 mi)
1:36:067:200.68 mi5:02
7:23
-0:01
25K
1:54:237:222.42 mi18:17
7:32
+0:09
30K
2:18:457:273.11 mi24:22
7:51
+0:19
20M
2:29:017:271.36 mi10:16
7:33
-0:18
21M
2:37:547:311.00 mi8:53
8:53
+1:20
35K
2:43:487:320.75 mi5:54
7:53
-1:00
23M
2:53:327:331.25 mi9:44
7:46
-0:07
24M
3:01:347:341.00 mi8:02
8:02
+0:16
40K
3:08:477:360.85 mi7:13
8:26
+0:24
25.2M
3:11:567:370.35 mi3:09
9:08
+0:42
Finish(26.22 mi)
3:20:167:391.02 mi8:20
8:11
-0:57
Trend:
Faster pace
Steady pace
Slower pace

Checkpoints & Pacing

Pace Line

Fastest Pace

7:11 /mi

Average Pace

7:39 /mi

Slowest Pace

9:08 /mi

Loading chart...
Fastest
Middle
Slowest
Average

Segments

Time at Faster Pace

1:12:49

36% of race

Time at Steady Pace

1:39:52

50% of race

Time at Slower Pace

27:35

14% of race

Average Pace: 7:38 /mi

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

Heatmap

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

Checkpoint and Segment Rankings

CheckpointSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi956479067906801469326932
10K3.10 mi8714+8507410+4967410+496797869256925
15K3.11 mi8483+2317258+1527258+152801469326932
20K3.11 mi8448+357222+367222+36853472187218
Half(13.11 mi)0.68 mi8489-417248-267248-26919776327632
25K2.42 mi8538-497252-47252-4907474837483
30K3.11 mi8699-1617319-677319-67967176517651
20M1.36 mi8556+1437209+1107209+110718461016101
21M1.00 mi8802-2467349-1407349-1401271988948894
35K0.75 mi8874-727375-267375-261123782198219
23M1.25 mi8817+577309+667309+66821865366536
24M1.00 mi8901-847331-227331-221143481108110
40K0.85 mi9046-1457407-767407-761293387398739
25.2M0.35 mi9099-537425-187425-181318288238823
Finish(26.22 mi)1.02 mi9264-1657490-657490-651324188868886

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 30%
×21story building
+97ft-345ft

Overall

8014

Males

6932

M50-54

6932

5K→10K

3.1 - 6.2 mi

Top 30%
×5story building
+79ft-138ft

Overall

7978

Males

6925

M50-54

6925

10K→15K

6.2 - 9.3 mi

Top 30%
×3story building
+67ft-78ft

Overall

8014

Males

6932

M50-54

6932

15K→20K

9.3 - 12.4 mi

Top 32%
×5story building
+106ft-86ft

Overall

8534

Males

7218

M50-54

7218

20K→Half

12.4 - 13.1 mi

Top 35%
×2story building
+19ft-37ft

Overall

9197

Males

7632

M50-54

7632

Half→25K

13.1 - 15.5 mi

Top 34%
×4story building
+66ft-88ft

Overall

9074

Males

7483

M50-54

7483

25K→30K

15.5 - 18.6 mi

Top 36%
×9story building
+181ft-148ft

Overall

9671

Males

7651

M50-54

7651

30K→20M

18.6 - 20.0 mi

Top 27%
×5story building
+64ft-50ft

Overall

7184

Males

6101

M50-54

6101

20M→21M

20.0 - 21.0 mi

Top 48%
×8story building
+106ft-24ft

Overall

12719

Males

8894

M50-54

8894

21M→35K

21.0 - 21.8 mi

Top 42%
×7story building
+17ft-86ft

Overall

11237

Males

8219

M50-54

8219

35K→23M

21.8 - 23.0 mi

Top 31%
×5story building
+23ft-63ft

Overall

8218

Males

6536

M50-54

6536

23M→24M

23.0 - 24.0 mi

Top 43%
×6story building
+12ft-82ft

Overall

11434

Males

8110

M50-54

8110

24M→40K

24.0 - 24.9 mi

Top 49%
×1story
+6ft-20ft

Overall

12933

Males

8739

M50-54

8739

40K→25.2M

24.9 - 25.2 mi

Top 50%
×1story
+13ft-16ft

Overall

13182

Males

8823

M50-54

8823

25.2M→Finish

25.2 - 26.2 mi

Top 50%
×2story building
+22ft-21ft

Overall

13241

Males

8886

M50-54

8886

Passing Analysis

Category:
Passed
1930
Passed By
1630
Net Change
+300
SegmentPassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#9564
5K → 10K89141+850#9564#8714
10K → 15K27544+231#8714#8483
15K → 20K150115+35#8483#8448
20K → Half748-41#8448#8489
Half → 25K78127-49#8489#8538
25K → 30K123284-161#8538#8699
30K → 20M15310+143#8699#8556
20M → 21M27273-246#8556#8802
21M → 35K2799-72#8802#8874
35K → 23M10447+57#8874#8817
23M → 24M44128-84#8817#8901
24M → 40K20165-145#8901#9046
40K → 25.2M1164-53#9046#9099
25.2M → Finish20185-165#9099#9264
TOTALS19301630+300

Passing Charts

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