NASCAR XFINITY SERIES AT IOWA
Iowa Speedway — June 24, 2017
William Byron
Winner
250
Laps
40
Entries
6
Leaders
William Byron won the 2017 NASCAR XFINITY SERIES AT IOWA at Iowa Speedway on June 24, 2017, leading 78 of 250 laps. Ryan Sieg finished second; Tyler Reddick rounded out the podium. The race featured 6 different leaders.
Race Details
| Pos | Start | +/- | Driver |
|---|---|---|---|
| 1 | 6 | +5 | William Byron |
| 2 | 22 | +20 | Ryan Sieg |
| 3 | 15 | +12 | Tyler Reddick |
| 4 | 14 | +10 | Ross Chastain |
| 5 | 7 | +2 | Dakoda Armstrong |
| 6 | 20 | +14 | Michael Annett |
| 7 | 18 | +11 | Jeremy Clements |
| 8 | 4 | -4 | Elliott Sadler |
| 9 | 5 | -4 | Justin Allgaier |
| 10 | 31 | +21 | Garrett Smithley |
| 11 | 30 | +19 | Tommy Joe Martins |
| 12 | 27 | +15 | Quin Houff |
| 13 | 25 | +12 | J.J. Yeley |
| 14 | 32 | +18 | David Starr |
| 15 | 28 | +13 | Dylan Lupton |
| 16 | 1 | -15 | Christopher Bell |
| 17 | 26 | +9 | B.J. McLeod |
| 18 | 37 | +19 | Joey Gase |
| 19 | 17 | -2 | Ryan Reed |
| 20 | 21 | +1 | Ben Kennedy |
| 21 | 11 | -10 | Daniel Hemric |
| 22 | 9 | -13 | Matt Tifft |
| 23 | 23 | — | Brandon Jones |
| 24 | 24 | — | Cole Custer |
| 25 | 13 | -12 | Blake Koch |
| 26 | 16 | -10 | Brendan Gaughan |
| 27 | 8 | -19 | Brennan Poole |
| 28 | 38 | +10 | Timmy Hill |
| 29 | 34 | +5 | Ray Black, Jr. |
| 30 | 19 | -11 | Spencer Gallagher |
| 31 | 2 | -29 | Kyle Benjamin |
| 32 | 12 | -20 | Scott Lagasse Jr. |
| 33 | 33 | — | Dexter Bean |
| 34 | 10 | -24 | Ty Majeski |
| 35 | 40 | +5 | Mike Harmon |
| 36 | 29 | -7 | Harrison Rhodes |
| 37 | 3 | -34 | Sam Hornish Jr. |
| 38 | 39 | +1 | Carl Long |
| 39 | 36 | -3 | Morgan Shepherd |
| 40 | 35 | -5 | Jeff Green |
Model Performance
How well did the NR-Rating model predict this race? Across 12 matched drivers, the model averaged 6.7 positions off — better than the season average of 8.5. Good
| Pos | Driver | Predicted | Actual | Delta |
|---|---|---|---|---|
| 1 | William Byron | 10.7 | 1 | +9.7 |
| 3 | Tyler Reddick | 6.2 | 3 | +3.2 |
| 4 | Ross Chastain | 13.3 | 4 | +9.3 |
| 9 | Justin Allgaier | 18.3 | 9 | +9.3 |
| 13 | J.J. Yeley | 28.8 | 13 | +15.8 |
| 14 | David Starr | 20.9 | 14 | +6.9 |
| 16 | Christopher Bell | 10.7 | 16 | -5.3 |
| 17 | B.J. McLeod | 24.8 | 17 | +7.8 |
| 18 | Joey Gase | 23.4 | 18 | +5.4 |
| 24 | Cole Custer | 22.9 | 24 | -1.1 |
| 27 | Brennan Poole | 24.7 | 27 | -2.3 |
| 28 | Timmy Hill | 23.9 | 28 | -4.1 |
Predicted finish from NR-Rating model. Delta = predicted − actual (positive = driver beat prediction). Confidence: High Confidence = low variance (stdDev ≤ 9), Moderate = medium variance, Coinflip = high variance.
Historical Context
- William Byron: has 5 career starts at Iowa Speedway with a 2.8 avg finish (3 wins) — the model may have underweighted this track history.
- Tyler Reddick: was the model’s top pick based on 10 career starts at Iowa Speedway with a 12.5 avg finish, finishing P3 on the day.
- J.J. Yeley: was the biggest surprise, finishing P13 vs predicted P29. Track history: 12 starts, 23.5 avg finish.
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Frequently Asked Questions
Who won the 2017 NASCAR XFINITY SERIES AT IOWA?
William Byron won the 2017 NASCAR XFINITY SERIES AT IOWA at Iowa Speedway.
Where was the 2017 NASCAR XFINITY SERIES AT IOWA held?
The 2017 NASCAR XFINITY SERIES AT IOWA was held at Iowa Speedway on June 24, 2017.