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SF MARATHON 1ST HALF 2025

Stephanie Chan Shum

Alameda, CA

Bib: 17141 F 33

0:00
0:00
/ mi
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Overall
#0 / 7100
Gender (Female)
#0 / 3107
Division (F30-34)
#0 / 691
Race Day Weather
56°/46°F
light rain

Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
1.81M
10:41/mi
19:21
→ flat
5.34M
10:23/mi
56:00
↑ 80↓ 74
6.15M
10:22/mi
1:04:24
↑ 126
10.54M
11:40/mi
1:55:39
↑ 230↓ 361
11.05M
15:27/mi
2:03:32
↑ 172
Finish· 13.11 mi
13:21/mi
2:31:02
↑ 97↓ 114
Course Elevation
10–277 ft
≈
×22story building
•▲ 774 ft climb · ▼ 557 ft descent

The Course

Half Splits

1st Half· via 6.15M
1:04:2410:28 /mi⚡ faster
2nd Half
1:26:3812:27 /mi+34.5%
Positive split — 34.5% slower in the second half
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Your race, unpacked

See your splits, ranks & AI insights.

Checkpoint Splits

CheckpointTimeAvg PaceSegment LengthSegment TimeSegment PaceTrendDiff
1.81M
19:2110:411.81 mi19:21
10:41
-
5.34M
56:0010:293.53 mi36:39
10:23
-0:18
6.15M
1:04:2410:280.81 mi8:24
10:22
-0:01
10.54M
1:55:3910:584.39 mi51:15
11:40
+1:18
11.05M
2:03:3211:110.51 mi7:53
15:27
+3:47
Finish(13.11 mi)
2:31:0211:312.06 mi27:30
13:21
-2:06
Trend:
Faster pace
Steady pace
Slower pace

Checkpoints & Pacing

Pace Line

Fastest Pace

10:22 /mi

Average Pace

11:31 /mi

Slowest Pace

15:27 /mi

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Fastest
Middle
Slowest
Average

Segments

Time at Faster Pace

1:04:24

43% of race

Time at Steady Pace

51:15

34% of race

Time at Slower Pace

35:23

23% of race

Average Pace: 11:31 /mi

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Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

Heatmap

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0mi3.3mi6.6mi9.8mi13.1mi
Pace:
Faster
Steady
Slower

Checkpoint and Segment Rankings

CheckpointSeg. DistOverallFemalesF30-34Seg. OverallSeg. FemalesSeg. F30-34
1.81M1.81 mi5255202545552552025455
5.34M3.53 mi4402+8531581+444357+9840471402316
6.15M0.81 mi4187+2151471+110336+2132211014231
10.54M4.39 mi4626-4391702-231390-5450721975458
11.05M0.51 mi4580+461680+22385+542551560360
Finish(13.11 mi)2.06 mi4893-3131875-195445-6059032497577

Segment Performance Analysis

Start → 1.81M

0.0 - 1.8 mi

Top 74%
~flat
+4ft-3ft

Overall

5255

Females

2025

F30-34

456

1.81M→5.34M

1.8 - 5.3 mi

Top 57%
×4story building
+80ft-74ft

Overall

4047

Females

1402

F30-34

317

5.34M→6.15M

5.3 - 6.2 mi

Top 45%
×10story building
+126ft-4ft

Overall

3221

Females

1014

F30-34

232

6.15M→10.54M

6.2 - 10.5 mi

Top 71%
×21story building
+230ft-361ft

Overall

5072

Females

1975

F30-34

459

10.54M→11.05M

10.5 - 11.1 mi

Top 60%
×14story building
+172ft-0ft

Overall

4255

Females

1560

F30-34

361

11.05M→Finish

11.1 - 13.1 mi

Top 83%
×7story building
+97ft-114ft

Overall

5903

Females

2497

F30-34

577

Passing Analysis

Category:
▲Net Change
+0
0 passed by0* passed
SegmentMovementRank
Start → 1.81M-#5255
1.81M → 5.34M
39892*+853
#5255 → #4402
5.34M → 6.15M
7222+215
#4402 → #4187
6.15M → 10.54M
50566*-439
#4187 → #4626
10.54M → 11.05M
2672+46
#4626 → #4580
11.05M → Finish
34431*-313
#4580 → #4893
TOTALS
9211283*+362
#5255 → #4893

* Includes athletes who did not complete a segment (DNF/DNQ).

Passing Visualized

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Passing Circle

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Position Flow

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Race Lanes

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Official Timing Data

The San Francisco Marathon

The San Francisco Marathon

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