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BOSTON MARATHON 2023

Tienfu Chang

Bib: 13471•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M50-54)
#0 / 2052
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
7:30/mi
23:17
↑ 97↓ 3451.5%
10K· 6.21 mi
7:37/mi
46:58
↑ 79↓ 1380.4%
15K· 9.32 mi
7:47/mi
1:11:09
↑ 67↓ 78
20K· 12.43 mi
7:52/mi
1:35:34
↑ 106↓ 860.1%
Half· 13.11 mi
7:43/mi
1:40:50
↑ 19↓ 370.5%
25K· 15.53 mi
8:08/mi
2:00:34
↑ 66↓ 880.2%
30K· 18.64 mi
8:30/mi
2:26:58
↑ 181↓ 1480.2%
20M
8:52/mi
2:39:01
↑ 64↓ 500.2%
21M
9:20/mi
2:48:21
↑ 106↓ 241.6%
35K· 21.75 mi
8:11/mi
2:54:28
↑ 17↓ 861.7%
23M
9:15/mi
3:06:03
↑ 23↓ 630.6%
24M
9:16/mi
3:15:19
↓ 821.3%
40K· 24.85 mi
10:53/mi
3:24:37
↓ 200.3%
25.2M
11:21/mi
3:28:32
↑ 13↓ 160.2%
Finish· 26.22 mi
9:39/mi
3:38:22
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:40:50
Pace7:41 /mi
2nd Half
Distance13.11 mi
Time1:57:32
Pace8:58 /mi
📊Positive Split: 16.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:51:0723:177:3023:17
7:30
-
10K
6.21 mi11:14:4846:587:3423:41
7:37
+0:07
15K
9.32 mi11:38:591:11:097:3824:11
7:47
+0:10
20K
12.43 mi12:03:241:35:347:4124:25
7:52
+0:05
Half
13.11 mi12:08:401:40:507:415:16
7:43
-0:09
25K
15.53 mi12:28:242:00:347:4619:44
8:08
+0:25
30K
18.64 mi12:54:482:26:587:5326:24
8:30
+0:22
20M
20.00 mi13:06:512:39:017:5712:03
8:52
+0:22
21M
21.00 mi13:16:112:48:218:019:20
9:20
+0:28
35K
21.75 mi13:22:182:54:288:016:07
8:11
-1:09
23M
23.00 mi13:33:533:06:038:0511:35
9:15
+1:04
24M
24.00 mi13:43:093:15:198:089:16
9:16
+0:01
40K
24.85 mi13:52:273:24:378:149:18
10:53
+1:37
25.2M
25.20 mi13:56:223:28:328:173:55
11:21
+0:28
Finish
26.22 mi14:06:123:38:228:209:50
9:39
-1:42

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

7:30 /mi

Average Pace

8:20 /mi

Slowest Pace

11:21 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:40:50

46% of race

Time at Steady Pace

1:04:18

29% of race

Time at Slower Pace

53:14

24% of race

Average Pace: 8:20 /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 mi10:51:0723:177:3023:17
7:30
#9579
10K
6.21 mi11:14:4846:587:3423:41
7:37
#10550
15K
9.32 mi11:38:591:11:097:3824:11
7:47
#11228
20K
12.43 mi12:03:241:35:347:4124:25
7:52
#11440
Half
13.11 mi12:08:401:40:507:415:16
7:43
#11471
25K
15.53 mi12:28:242:00:347:4619:44
8:08
#11819
30K
18.64 mi12:54:482:26:587:5326:24
8:30
#12339
20M
20.00 mi13:06:512:39:017:5712:03
8:52
#12629
21M
21.00 mi13:16:112:48:218:019:20
9:20
#12794
35K
21.75 mi13:22:182:54:288:016:07
8:11
#12801
23M
23.00 mi13:33:533:06:038:0511:35
9:15
#13116
24M
24.00 mi13:43:093:15:198:089:16
9:16
#13406
40K
24.85 mi13:52:273:24:378:149:18
10:53
#13993
25.2M
25.20 mi13:56:223:28:328:173:55
11:21
#14206
Finish
26.22 mi14:06:123:38:228:209:50
9:39
#14517
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi95797921792112584(Top 47%)9342(Top 62%)9342(Top 455%)
10K6.21 mi3.10 mi10550-9718444-5238444-52311532(Top 43%)8902(Top 59%)8902(Top 434%)
15K9.32 mi3.11 mi11228-6788762-3188762-31812584(Top 47%)9342(Top 62%)9342(Top 455%)
20K12.43 mi3.11 mi11440-2128843-818843-8112239(Top 46%)9121(Top 60%)9121(Top 444%)
Half13.11 mi0.68 mi11471-318848-58848-512020(Top 45%)9097(Top 60%)9097(Top 443%)
25K15.53 mi2.42 mi11819-3488980-1328980-13213779(Top 52%)9678(Top 64%)9678(Top 472%)
30K18.64 mi3.11 mi12339-5209153-1739153-17314293(Top 54%)9769(Top 64%)9769(Top 476%)
20M20.00 mi1.36 mi12629-2909260-1079260-10715799(Top 59%)10327(Top 68%)10327(Top 503%)
21M21.00 mi1.00 mi12794-1659309-499309-4915153(Top 57%)9988(Top 66%)9988(Top 487%)
35K21.75 mi0.75 mi12801-79297+129297+1213263(Top 50%)9104(Top 60%)9104(Top 444%)
23M23.00 mi1.25 mi13116-3159413-1169413-11617283(Top 65%)10812(Top 71%)10812(Top 527%)
24M24.00 mi1.00 mi13406-2909514-1019514-10118308(Top 69%)11221(Top 74%)11221(Top 547%)
40K24.85 mi0.85 mi13993-5879711-1979711-19722078(Top 83%)12864(Top 85%)12864(Top 627%)
25.2M25.20 mi0.35 mi14206-2139777-669777-6621197(Top 80%)12463(Top 82%)12463(Top 607%)
Finish26.22 mi1.02 mi14517-3119891-1149891-11420613(Top 77%)12232(Top 81%)12232(Top 596%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 47%
×21story building
+97ft-345ft

Overall

12584

Males

9342

M50-54

9342

5K→10K

3.1 - 6.2 mi

Top 43%
×5story building
+79ft-138ft

Overall

11532

Males

8902

M50-54

8902

10K→15K

6.2 - 9.3 mi

Top 47%
×3story building
+67ft-78ft

Overall

12584

Males

9342

M50-54

9342

15K→20K

9.3 - 12.4 mi

Top 46%
×5story building
+106ft-86ft

Overall

12239

Males

9121

M50-54

9121

20K→Half

12.4 - 13.1 mi

Top 45%
×2story building
+19ft-37ft

Overall

12020

Males

9097

M50-54

9097

Half→25K

13.1 - 15.5 mi

Top 52%
×4story building
+66ft-88ft

Overall

13779

Males

9678

M50-54

9678

25K→30K

15.5 - 18.6 mi

Top 54%
×9story building
+181ft-148ft

Overall

14293

Males

9769

M50-54

9769

30K→20M

18.6 - 20.0 mi

Top 59%
×5story building
+64ft-50ft

Overall

15799

Males

10327

M50-54

10327

20M→21M

20.0 - 21.0 mi

Top 57%
×8story building
+106ft-24ft

Overall

15153

Males

9988

M50-54

9988

21M→35K

21.0 - 21.8 mi

Top 50%
×7story building
+17ft-86ft

Overall

13263

Males

9104

M50-54

9104

35K→23M

21.8 - 23.0 mi

Top 65%
×5story building
+23ft-63ft

Overall

17283

Males

10812

M50-54

10812

23M→24M

23.0 - 24.0 mi

Top 69%
×6story building
+12ft-82ft

Overall

18308

Males

11221

M50-54

11221

24M→40K

24.0 - 24.9 mi

Top 83%
×1story
+6ft-20ft

Overall

22078

Males

12864

M50-54

12864

40K→25.2M

24.9 - 25.2 mi

Top 80%
×1story
+13ft-16ft

Overall

21197

Males

12463

M50-54

12463

25.2M→Finish

25.2 - 26.2 mi

Top 77%
×2story building
+22ft-21ft

Overall

20613

Males

12232

M50-54

12232

Passing Analysis

Category:
Athletes Passed
555
Passed By
5492
Net Change
-4938
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#9579
5K → 10K581028-971#9579#10550
10K → 15K36714-678#10550#11228
15K → 20K106318-212#11228#11440
20K → Half2051-31#11440#11471
Half → 25K51399-348#11471#11819
25K → 30K79599-520#11819#12339
30K → 20M41331-290#12339#12629
20M → 21M49214-165#12629#12794
21M → 35K5360-7#12794#12801
35K → 23M24339-315#12801#13116
23M → 24M15305-290#13116#13406
24M → 40K6593-587#13406#13993
40K → 25.2M1214-213#13993#14206
25.2M → Finish16327-311#14206#14517
TOTALS5555492-4938
📊

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