Shelby Mahaffie

Chicago

Bib: 50965 F

0:00

0:00

/ mi

Be the first to cheer!

Overall

#0 / 54109

Gender (Female)

#0 / 24561

Division (F25-29)

#0 / 5362

Race Day Weather

54°/44°F

few clouds

Race Timeline

Ribbon color based on

FasterSteadySlower· vs. your average pace

Start

0:00

Race begins

600 ft elev

5K· 3.11 mi

12:25/mi

38:34

↑ 52 ft↓ 48 ft

601 ft elev

10K· 6.21 mi

12:23/mi

1:17:02

↑ 25 ft↓ 31 ft

593 ft elev

15K· 9.32 mi

13:24/mi

1:58:39

↑ 12 ft↓ 13 ft

593 ft elev

20K· 12.43 mi

13:07/mi

2:39:25

↑ 18 ft↓ 17 ft

596 ft elev

Half· 13.11 mi

14:22/mi

2:49:13

↑ 13 ft0.2% grade

603 ft elev

25K· 15.53 mi

13:23/mi

3:21:40

↑ 22 ft↓ 30 ft

597 ft elev

30K· 18.64 mi

13:36/mi

4:03:54

↑ 13 ft↓ 12 ft

597 ft elev

35K· 21.75 mi

14:43/mi

4:49:36

↑ 27 ft↓ 27 ft

597 ft elev

40K· 24.85 mi

14:28/mi

5:34:33

↑ 16 ft↓ 11 ft

602 ft elev

Finish· 26.22 mi

13:38/mi

5:53:09

↑ 23 ft↓ 20 ft

606 ft elev

Course Elevation

227ft

Total climb

32ft

Range

589 to 621 ft

221ft

Total descent

About the height of a three-story building

The Course

Half Splits

1st Half· via Half

2:49:1312:54 /mi⚡ faster

2nd Half

3:03:5614:02 /mi+8.7%

Positive split — 8.7% slower in the second half

AI Race Performance Report

Shelby's race, broken down like a coach

The full Race Story, performance analysis, segment & passing breakdowns, and where the race turned. Free to unlock — for anyone.

Free account · no payment

Checkpoint Splits

Checkpoint	Time	Avg Pace	Segment Length	Segment Time	Segment Pace	Diff
5K	38:34	12:25	3.11 mi	38:34	12:25	-
10K	1:17:02	12:24	3.10 mi	38:28	12:23	-0:02
15K	1:58:39	12:44	3.11 mi	41:37	13:24	+1:01
20K	2:39:25	12:50	3.11 mi	40:46	13:07	-0:17
Half(13.11 mi)	2:49:13	12:54	0.68 mi	9:48	14:22	+1:15
25K	3:21:40	12:59	2.42 mi	32:27	13:23	-0:59
30K	4:03:54	13:05	3.11 mi	42:14	13:36	+0:13
35K	4:49:36	13:19	3.11 mi	45:42	14:43	+1:07
40K	5:34:33	13:28	3.10 mi	44:57	14:28	-0:15
Finish(26.22 mi)	5:53:09	13:29	1.37 mi	18:36	13:38	-0:50

Trend:

Faster pace

Steady pace

Slower pace

Checkpoints & Pacing

Pace Line

Fastest Pace

12:23 /mi

Average Pace

13:29 /mi

Slowest Pace

14:43 /mi

Loading chart...

Fastest

Middle

Slowest

Average

Segments

Time at Faster Pace

3:54:06

66% of race

Time at Steady Pace

1:13:21

21% of race

Time at Slower Pace

45:42

13% of race

Average Pace: 13:28 /mi

Loading chart...

Faster pace (< avg)

Steady pace (≈ avg)

Slower pace (> avg)

Heatmap

0mi6.6mi13.1mi19.7mi26.2mi

Pace:

Faster

Steady

Slower

Checkpoint and Segment Rankings

Checkpoint	Seg. Dist	Overall	Females	F25-29	Seg. Overall	Seg. Females	Seg. F25-29
5K	3.11 mi	50991	22345	4986	51804	22920	5116
10K	3.10 mi	49771+1220	21513+832	4807+179	48502	20689	4655
15K	3.11 mi	50676-905	22112-599	4958-151	51804	22920	5116
20K	3.11 mi	50420+256	21966+146	4943+15	49657	21544	4857
Half(13.11 mi)	0.68 mi	50453-33	21997-31	4943	50454	22163	4976
25K	2.42 mi	50056+397	21752+245	4897+46	47986	20738	4683
30K	3.11 mi	49515+541	21460+292	4842+55	46304	19946	4550
35K	3.11 mi	49396+119	21441+19	4828+14	48041	21168	4788
40K	3.10 mi	49074+322	21311+130	4803+25	45371	20008	4538
Finish(26.22 mi)	1.37 mi	49025+49	21311	4811-8	47426	21121	4849

21121

Passing Analysis

No position changes recorded for this athlete.

More below

See the rest of Shelby's race

Checkpoint splits, rankings, passing analysis and qualifying. One free sign-in reveals them here — and on every race you look up.

All Results

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support

Public Race Data

Enhanced athlete results built from publicly available data.

Race managed by

Chicago Event Management

Race timed by

Mika Timing