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BOSTON MARATHON 2025

Zailong Bian

Bib: 14767•M

OR

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 37%
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Top 40%
Division (M50-54)
#0 / 1996
Top 41%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:10
Rank: #11839
Start → 5K
23:10 | 7:27/mi
10K· 6.21 mi
46:22
Rank: #11792 (+47)
5K → 10K
23:12 | 7:28/mi
15K· 9.32 mi
1:09:12
Rank: #11291 (+501)
10K → 15K
22:50 | 7:21/mi
20K· 12.43 mi
1:32:42
Rank: #11306 (-15)
15K → 20K
23:30 | 7:34/mi
Half· 13.11 mi
1:37:45
Rank: #11277 (+29)
20K → Half
5:03 | 7:24/mi
25K· 15.53 mi
1:56:17
Rank: #11215 (+62)
Half → 25K
18:32 | 7:39/mi
30K· 18.64 mi
2:21:25
Rank: #11324 (-109)
25K → 30K
25:08 | 8:05/mi
20M
2:32:16
Rank: #11192 (+132)
30K → 20M
10:51 | 7:59/mi
21M
2:40:35
Rank: #11045 (+147)
20M → 21M
8:19 | 8:19/mi
35K· 21.75 mi
2:46:11
Rank: #10924 (+121)
21M → 35K
5:36 | 7:29/mi
23M
2:56:08
Rank: #10798 (+126)
35K → 23M
9:57 | 7:57/mi
24M
3:03:52
Rank: #10703 (+95)
23M → 24M
7:44 | 7:44/mi
40K· 24.85 mi
3:10:37
Rank: #10627 (+76)
24M → 40K
6:45 | 7:54/mi
25.2M
3:13:45
Rank: #10642 (-15)
40K → 25.2M
3:08 | 9:05/mi
Finish· 26.22 mi
3:21:42
Rank: #10639 (+3)
25.2M → Finish
7:57 | 7:48/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:37:45
Pace7:27 /mi
2nd Half
Distance13.11 mi
Time1:43:57
Pace7:56 /mi
📊Positive Split: 6.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:53:4023:107:2723:10
7:27
-
10K
6.21 mi11:16:5246:227:2823:12
7:28
+0:01
15K
9.32 mi11:39:421:09:127:2522:50
7:21
-0:07
20K
12.43 mi12:03:121:32:427:2823:30
7:34
+0:13
Half
13.11 mi12:08:151:37:457:275:03
7:24
-0:10
25K
15.53 mi12:26:471:56:177:2918:32
7:39
+0:15
30K
18.64 mi12:51:552:21:257:3525:08
8:05
+0:26
20M
20.00 mi13:02:462:32:167:3710:51
7:59
-0:06
21M
21.00 mi13:11:052:40:357:398:19
8:19
+0:20
35K
21.75 mi13:16:412:46:117:385:36
7:29
-0:50
23M
23.00 mi13:26:382:56:087:399:57
7:57
+0:28
24M
24.00 mi13:34:223:03:527:407:44
7:44
-0:13
40K
24.85 mi13:41:073:10:377:406:45
7:54
+0:10
25.2M
25.20 mi13:44:153:13:457:413:08
9:05
+1:11
Finish
26.22 mi13:52:123:21:427:427:57
7:48
-1:17

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

7:21 /mi

Average Pace

7:42 /mi

Slowest Pace

9:05 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:19:51

40% of race

Time at Steady Pace

1:14:25

37% of race

Time at Slower Pace

47:26

24% of race

Average Pace: 7:42 /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 mi10:53:4023:107:2723:10
7:27
#11839
10K
6.21 mi11:16:5246:227:2823:12
7:28
#11792
15K
9.32 mi11:39:421:09:127:2522:50
7:21
#11291
20K
12.43 mi12:03:121:32:427:2823:30
7:34
#11306
Half
13.11 mi12:08:151:37:457:275:03
7:24
#11277
25K
15.53 mi12:26:471:56:177:2918:32
7:39
#11215
30K
18.64 mi12:51:552:21:257:3525:08
8:05
#11324
20M
20.00 mi13:02:462:32:167:3710:51
7:59
#11192
21M
21.00 mi13:11:052:40:357:398:19
8:19
#11045
35K
21.75 mi13:16:412:46:117:385:36
7:29
#10924
23M
23.00 mi13:26:382:56:087:399:57
7:57
#10798
24M
24.00 mi13:34:223:03:527:407:44
7:44
#10703
40K
24.85 mi13:41:073:10:377:406:45
7:54
#10627
25.2M
25.20 mi13:44:153:13:457:413:08
9:05
#10642
Finish
26.22 mi13:52:123:21:427:427:57
7:48
#10639
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi118399100910010395(Top 37%)8292(Top 51%)8292(Top 415%)
10K6.21 mi3.10 mi11792+479062+389062+3811769(Top 41%)9034(Top 56%)9034(Top 453%)
15K9.32 mi3.11 mi11291+5018790+2728790+27210395(Top 37%)8292(Top 51%)8292(Top 415%)
20K12.43 mi3.11 mi11306-158769+218769+2111265(Top 40%)8624(Top 54%)8624(Top 432%)
Half13.11 mi0.68 mi11277+298757+128757+1210834(Top 38%)8459(Top 53%)8459(Top 424%)
25K15.53 mi2.42 mi11215+628685+728685+7211073(Top 39%)8419(Top 52%)8419(Top 422%)
30K18.64 mi3.11 mi11324-1098657+288657+2812007(Top 42%)8676(Top 54%)8676(Top 435%)
20M20.00 mi1.36 mi11192+1328557+1008557+10010334(Top 36%)7707(Top 48%)7707(Top 386%)
21M21.00 mi1.00 mi11045+1478451+1068451+1069320(Top 33%)7004(Top 43%)7004(Top 351%)
35K21.75 mi0.75 mi10924+1218359+928359+928514(Top 30%)6606(Top 41%)6606(Top 331%)
23M23.00 mi1.25 mi10798+1268264+958264+959618(Top 34%)7040(Top 44%)7040(Top 353%)
24M24.00 mi1.00 mi10703+958178+868178+869325(Top 33%)6819(Top 42%)6819(Top 342%)
40K24.85 mi0.85 mi10627+768117+618117+619413(Top 33%)6753(Top 42%)6753(Top 338%)
25.2M25.20 mi0.35 mi10642-158106+118106+1112202(Top 43%)8086(Top 50%)8086(Top 405%)
Finish26.22 mi1.02 mi10639+38071+358071+3511423(Top 40%)7718(Top 48%)7718(Top 387%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 37%
×21stories
+97ft-345ft

Overall

10395

Males

8292

M50-54

8292

5K→10K

3.1 - 6.2 mi

Top 41%
×5stories
+79ft-138ft

Overall

11769

Males

9034

M50-54

9034

10K→15K

6.2 - 9.3 mi

Top 37%
×3stories
+67ft-78ft

Overall

10395

Males

8292

M50-54

8292

15K→20K

9.3 - 12.4 mi

Top 40%
×5stories
+106ft-86ft

Overall

11265

Males

8624

M50-54

8624

20K→Half

12.4 - 13.1 mi

Top 38%
×2stories
+19ft-37ft

Overall

10834

Males

8459

M50-54

8459

Half→25K

13.1 - 15.5 mi

Top 39%
×4stories
+66ft-88ft

Overall

11073

Males

8419

M50-54

8419

25K→30K

15.5 - 18.6 mi

Top 42%
×9stories
+181ft-148ft

Overall

12007

Males

8676

M50-54

8676

30K→20M

18.6 - 20.0 mi

Top 36%
×5stories
+64ft-50ft

Overall

10334

Males

7707

M50-54

7707

20M→21M

20.0 - 21.0 mi

Top 33%
×8stories
+106ft-24ft

Overall

9320

Males

7004

M50-54

7004

21M→35K

21.0 - 21.8 mi

Top 30%
×7stories
+17ft-86ft

Overall

8514

Males

6606

M50-54

6606

35K→23M

21.8 - 23.0 mi

Top 34%
×5stories
+23ft-63ft

Overall

9618

Males

7040

M50-54

7040

23M→24M

23.0 - 24.0 mi

Top 33%
×6stories
+12ft-82ft

Overall

9325

Males

6819

M50-54

6819

24M→40K

24.0 - 24.9 mi

Top 33%
×1story
+6ft-20ft

Overall

9413

Males

6753

M50-54

6753

40K→25.2M

24.9 - 25.2 mi

Top 43%
×1story
+13ft-16ft

Overall

12202

Males

8086

M50-54

8086

25.2M→Finish

25.2 - 26.2 mi

Top 40%
×2stories
+22ft-21ft

Overall

11423

Males

7718

M50-54

7718

Passing Analysis

Category:
Athletes Passed
2403
Passed By
1203
Net Change
+1200
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11839
5K → 10K276229+47#11839#11792
10K → 15K52625+501#11792#11291
15K → 20K174189-15#11291#11306
20K → Half4516+29#11306#11277
Half → 25K194132+62#11277#11215
25K → 30K196305-109#11215#11324
30K → 20M17442+132#11324#11192
20M → 21M18336+147#11192#11045
21M → 35K1298+121#11045#10924
35K → 23M16236+126#10924#10798
23M → 24M12631+95#10798#10703
24M → 40K10428+76#10703#10627
40K → 25.2M3752-15#10627#10642
25.2M → Finish7774+3#10642#10639
TOTALS24031203+1200
📊

Passing Visuals

Category:
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🔥Passing Intensity

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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