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BOSTON MARATHON 2025

Li Chang

Bib: 12049 M TW

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M45-49)
#0 / 2386
Race Day Weather
50°/40°F
broken clouds

Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
7:52/mi
24:26
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
7:56/mi
49:05
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
7:56/mi
1:13:45
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
8:37/mi
1:40:31
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
8:24/mi
1:46:15
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
8:12/mi
2:06:08
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
8:35/mi
2:32:49
↑ 181↓ 1480.2%
138 ft elev
20M
8:48/mi
2:44:47
↑ 64↓ 500.2%
148 ft elev
21M
9:36/mi
2:54:23
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
8:59/mi
3:01:06
↑ 17↓ 861.7%
156 ft elev
23M
8:51/mi
3:12:11
↑ 23↓ 630.6%
116 ft elev
24M
8:35/mi
3:20:46
↓ 821.3%
34 ft elev
40K· 24.85 mi
8:46/mi
3:28:16
↓ 200.3%
20 ft elev
25.2M
9:34/mi
3:31:34
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
8:38/mi
3:40:22
↑ 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
1:46:158:06 /mi⚡ faster
2nd Half
1:54:078:42 /mi+7.4%
Positive split — 7.4% 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
24:267:523.11 mi24:26
7:52
-
10K
49:057:543.10 mi24:39
7:56
+0:04
15K
1:13:457:553.11 mi24:40
7:56
0:00
20K
1:40:318:053.11 mi26:46
8:37
+0:41
Half(13.11 mi)
1:46:158:060.68 mi5:44
8:24
-0:13
25K
2:06:088:072.42 mi19:53
8:12
-0:12
30K
2:32:498:123.11 mi26:41
8:35
+0:23
20M
2:44:478:141.36 mi11:58
8:48
+0:13
21M
2:54:238:181.00 mi9:36
9:36
+0:48
35K
3:01:068:200.75 mi6:43
8:59
-0:37
23M
3:12:118:211.25 mi11:05
8:51
-0:08
24M
3:20:468:221.00 mi8:35
8:35
-0:16
40K
3:28:168:230.85 mi7:30
8:46
+0:11
25.2M
3:31:348:240.35 mi3:18
9:34
+0:48
Finish(26.22 mi)
3:40:228:251.02 mi8:48
8:38
-0:56
Trend:
Faster pace
Steady pace
Slower pace

Checkpoints & Pacing

Pace Line

Fastest Pace

7:52 /mi

Average Pace

8:25 /mi

Slowest Pace

9:36 /mi

Loading chart...
Fastest
Middle
Slowest
Average

Segments

Time at Faster Pace

1:33:38

42% of race

Time at Steady Pace

1:47:07

49% of race

Time at Slower Pace

19:37

9% of race

Average Pace: 8:24 /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. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi153661056410564155581062610626
10K3.10 mi15657-29110682-11810682-118159351080510805
15K3.11 mi15608+4910663+1910663+19155581062610626
20K3.11 mi16588-98011047-38411047-384189251199611996
Half(13.11 mi)0.68 mi16700-11211092-4511092-45185621183511835
25K2.42 mi16448+25210967+12510967+125153121036810368
30K3.11 mi16193+25510811+15610811+156153091019010190
20M1.36 mi16132+6110742+6910742+69156781023010230
21M1.00 mi16104+2810700+4210700+42165211048010480
35K0.75 mi16153-4910695+510695+5180991108911089
23M1.25 mi16045+10810621+7410621+741538998099809
24M1.00 mi15999+4610572+4910572+491503596049604
40K0.85 mi15939+6010529+4310529+431501394569456
25.2M0.35 mi15913+2610501+2810501+281490593629362
Finish(26.22 mi)1.02 mi15963-5010508-710508-7170471041210412

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 55%
×21story building
+97ft-345ft

Overall

15558

Males

10626

M45-49

10626

5K→10K

3.1 - 6.2 mi

Top 56%
×5story building
+79ft-138ft

Overall

15935

Males

10805

M45-49

10805

10K→15K

6.2 - 9.3 mi

Top 55%
×3story building
+67ft-78ft

Overall

15558

Males

10626

M45-49

10626

15K→20K

9.3 - 12.4 mi

Top 67%
×5story building
+106ft-86ft

Overall

18925

Males

11996

M45-49

11996

20K→Half

12.4 - 13.1 mi

Top 65%
×2story building
+19ft-37ft

Overall

18562

Males

11835

M45-49

11835

Half→25K

13.1 - 15.5 mi

Top 54%
×4story building
+66ft-88ft

Overall

15312

Males

10368

M45-49

10368

25K→30K

15.5 - 18.6 mi

Top 54%
×9story building
+181ft-148ft

Overall

15309

Males

10190

M45-49

10190

30K→20M

18.6 - 20.0 mi

Top 55%
×5story building
+64ft-50ft

Overall

15678

Males

10230

M45-49

10230

20M→21M

20.0 - 21.0 mi

Top 58%
×8story building
+106ft-24ft

Overall

16521

Males

10480

M45-49

10480

21M→35K

21.0 - 21.8 mi

Top 64%
×7story building
+17ft-86ft

Overall

18099

Males

11089

M45-49

11089

35K→23M

21.8 - 23.0 mi

Top 54%
×5story building
+23ft-63ft

Overall

15389

Males

9809

M45-49

9809

23M→24M

23.0 - 24.0 mi

Top 53%
×6story building
+12ft-82ft

Overall

15035

Males

9604

M45-49

9604

24M→40K

24.0 - 24.9 mi

Top 53%
×1story
+6ft-20ft

Overall

15013

Males

9456

M45-49

9456

40K→25.2M

24.9 - 25.2 mi

Top 52%
×1story
+13ft-16ft

Overall

14905

Males

9362

M45-49

9362

25.2M→Finish

25.2 - 26.2 mi

Top 60%
×2story building
+22ft-21ft

Overall

17047

Males

10412

M45-49

10412

Passing Analysis

Category:
Passed
1884
Passed By
2481
Net Change
-597
SegmentPassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#15366
5K → 10K205496-291#15366#15657
10K → 15K229180+49#15657#15608
15K → 20K441024-980#15608#16588
20K → Half14126-112#16588#16700
Half → 25K28230+252#16700#16448
25K → 30K361106+255#16448#16193
30K → 20M14281+61#16193#16132
20M → 21M11385+28#16132#16104
21M → 35K53102-49#16104#16153
35K → 23M16355+108#16153#16045
23M → 24M8640+46#16045#15999
24M → 40K9636+60#15999#15939
40K → 25.2M4923+26#15939#15913
25.2M → Finish4797-50#15913#15963
TOTALS18842481-597

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