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You are here: Home / iRacing Setup Stagger Chart

iRacing Setup Stagger Chart

The tire staggers on this page are fairly accurate. I would estimate they are within +/- 1/8 inch. If you start with these staggers on the rear (and on the front is recommended) you may find the car to be extremely loose on exit and possibly in the middle of the corner. In most cases, it can be adjusted out using springs, shocks, bars, etc. It’s easier to say, “I’ll just adjust the stagger until it feels right.” That is probably a mistake.

It’s pretty clear that iRacing has done a good job on the physics. It’s just as clear that the physics is a little off. Here is what I can tell you: When I’m able to make setups using the stagger settings in this chart, and get them adjusted out, I get more compliments on my setups than when I just set the stagger by “feel,” and I can tell that the setups work better. So, as a setup builder, you can build better setups if you try to at least get close to these staggers. If you can’t seem to get there, you will just have to lower the stagger a little and compromise. iRacing is great, but iRacing physics is not perfect.

There are many settings in the iRacing garage that are trial and error. You have to set them, try them, change them, try them again, until you find what works best. To me, that is the most tedious, frustrating, and boring thing about iRacing, but if you’re going to run advanced setups, you’re going to have to do it to be fast. Fortunately, tire stagger is one thing that can be calculated mathematically. The calculation may not always be perfect, but it is pretty close.

The stagger chart below was made using Matt Holden’s Stagger Calculator after I remeasured all the tracks using Google Earth. If you’re curious about the differences in my measurements, I’ve included that information below the chart. I’ve always found Matt’s Calculator to work pretty well when I’m looking for the right stagger for a given track and given car. You need a certain set of data to calculate tire stagger:

  • Track banking in degrees
  • Turn radius in feet
  • Track width aka tread width (the distance between the outside edge of the tires)
  • Left rear circumference

Since iRacing doesn’t provide all of this data, you have to scrounge it up for yourself. The only one that is easy to find is track banking. I believe I have included all of the relevant short tracks and cars.

Update 12/4/2016: I remeasured the radii on each track. In this measurement I attempted to use the racing line which changes some aspects of the measurement. Specifically, I measured the radius of the path that the right side tires would typically follow in race conditions. This increased the radius slightly on a few tracks, in turn making the calculated stagger slightly lower. Also, iRacing has provided the correct track width for all of the cars except the Street Stock. I don’t have updated information on any tire circumferences, but all tires vary in circumference due to differences in manufacturing and of course the air pressure used. For now, I am going to provide a range of staggers to use on the Street Stock on the tracks where there is actually a difference. The track width I originally found for the Street Stock was 65 inches. Stock Camaros from that era were not that wide and the track width was slightly wider in the front than in the back.

Untitled Document These stagger settings apply to asphalt cars only.
Track
LMS
SS
SLM
Mod
Legends
Bristol
1.75
1.5
1.75
1.875
1
Charlotte Leg.
3
3.25
3
4
1
Charlotte Oval
.75
.625
.75
.75
.625
Concord
1.625-2.25
1.375-1.5
1.625-2.25
1.625-2.375
1
Dover
.875
.75
.875
1
.75
Five Flags
1.625
1.375
1.625
1.75
1
Iowa
1
.875
1.125
1.125
.875
Irwindale (Inner)
2.5
2
2.5
2.625
1
Irwindale (Outer)
1.75
1.5
2
1.875
1
Langley
2.125
1.625
2.125
2.25
1
Lanier
2.375
1.875
2.375
2.5
1
Lucas
1.375
1.125
1.375
1.5
1
Martinsville
2.625
2.125
2.625
2.75
1
Montgomery
1.875
1.5
1.875
2
1
Myrtle Beach
1.625
1.25
1.625
1.75
1
New Hampshire
1.125
1
1.25
1.25
1
New Smyrna
2
1.625
2
2.125
1
Oxford Plains
2
1.625
2
2.125
1
Phoenix
1.125
.875
1.125
1.25
.875
Richmond
1.375
1.125
1.5
1.5
1
South Boston
2.25
1.75
2.25
2.375
1
Southern National
2.5
1.875
2.5
2.625
1
Stafford
2
1.625
2
2.125
1
The Bullring
2.625
2
2.625
2.75
1
The Milwaukee Mile
1
.875
1
1.125
.875

Thompson

2
1.625
2
2.125
1
USA
1.625
1.375
1.75
1.75
1
  • iRacing Late Model maximum stagger is 3 inches.
  • iRacing Street Stock maximum stagger is 1.5 inches.
  • iRacing Late Model maximum stagger is 3 inches.
  • iRacing Modified maximum stagger is 4 inches.
  • iRacing Legends car maximum stagger is 1 inch.

When I made this calculator, I decided to meticulously remeasure all of the track turn radii available using Google Earth. I found that some of my measurements were different from Matt’s. I came up with a standard process for making the measurements. I won’t get into the measurement details, but I will tell you where my measurements differed from Matt’s.

  • I measured Bristol’s turn one and two radius at 284 feet. Matt measured it at 242 feet. If you use Matt’s measurement, you’re going to want to raise your rear tire stagger one or two clicks from what I have in the chart.
  • Here are the measurements I took at Concord: Turn 1 radius, 287 feet, turn 2, 334 feet, turn 3, 235 feet – turn 1 banking, 14°, turn 2, 11°, turn 3, 14°. Since turn 2 is the key to this track, the correct stagger setting for that turn is important. On the chart, I include a range. The first number is the low end stagger (for turn 2). The second number is the high end stagger (for turn 3). I suggest a stagger setting somewhere in this range, and I would lean toward the lower end.
  • I measured Iowa’s turn radius at 479 feet. Matt’s measurement was 540.2 feet.
  • I measured Langley’s turn radius at 245. Matt measured it at 273, making his stagger calculations slightly lower.
  • My radius measurement at Lanier was 224 feet, just slightly higher than Matt’s measurement which was 218.4 feet. I also differ on the banking used for the stagger calculation. Lanier has graduated banking with 5° at the bottom of the track and 11° at the top. Matt uses the 11° number, but cars don’t run a high line at Lanier, therefore the correct banking would be 5°, making the correct stagger setting slightly higher, but only of little or no mathematical significance.
  • I measured Martinsville’s turn radius at 200. Matt measured it at 242.6. I spent some time remeasuring to verify my measurement. Another source I found lists the radius at 187 feet, but I think I’ll go with my measurement. One possible reason for these variations could be due to the way that I measure. I measure in the racing line. It’s not significant where tire stagger is concerned, but it’s worth noting that while some sources say that the banking is 12°, the Martinsville Speedway websites lists it at 11°.
  • I measured New Hampshire’s radius at 445 feet. Matt has it at 375 feet. According to the New Hampshire Motor Speedway website, 375 feet is the turn radius measured on the inside. I made my measurements in the racing line. The banking is variable from 2° to 7°. Since the cars run around the middle of the turns, I used 5° for my stagger calculation.
  • I measured the radius at New Smyrna Speedway at 225. Matt measured it at 267.2. The banking is given as 23°. This seems high to me but the New Smyrna Speedway website has the same information. Wikipedia, however, lists the banking as 18-20 degrees. In terms of tire stagger, I’ll stay with the 23° number.
  • I measured the radius at South Boston Speedway at 225 feet. Matt measured it at 251 feet.
  • I measured Stafford’s turn radius at 257 feet. Matt measured it at 309.8 feet. Another source of unknown reliability has Stafford’s turn radius at 235 feet. This may be measured at the bottom of the track. Since I measured it as a tighter turn, my stagger calculation comes out slightly higher than Matt’s.

As you can see there were quite a few differences. In no way do I imply that my measurements are more accurate. These can be measured in different ways. For the most part, I measured the turns tighter than Matt did, so my stagger chart shows higher stagger with a couple of exceptions. If you feel the stagger is too high, bump it down a couple of clicks.

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Reader Interactions

Comments

  1. Randy Murphy says

    August 13, 2015 at 1:45 pm

    I have a question, on the chart above, is the number given for the stagger of the rear tires?

    Reply
    • Jeff Kendrick says

      August 13, 2015 at 6:00 pm

      It’s best to use the stagger settings on front and rear.

      Reply
  2. Matt Holden says

    September 26, 2015 at 6:13 pm

    This is cool! I’m glad to see my work actually helps people. I’ve had a re-work of the calculator on the to-do list, is there a way I could get in touch with you to get the full list of turn radii that you found different? For most tracks, I used the track’s measurement, whether it was contacting them or a published value.

    The only one I know is probably wrong is Concord, because I worked at Concord Speedway when I wrote the calculator. The manager of the speedway gave me the values and said, “Well, at least we think that’s what they are…it’s been a while since it was paved.” Take that with a grain of salt then!

    Reply
  3. nate anderson says

    November 29, 2016 at 9:31 pm

    nothing on the milwaukee mile ??

    Reply
    • Jeff Kendrick says

      November 29, 2016 at 10:59 pm

      Very good. I either overlooked it or omitted it because I’m a short track guy and I guess it would be considered an intermediate track. But then I think I have New Hampshire there and USA right? I will look at that when I get time.

      Reply
  4. hooterville75 says

    September 16, 2020 at 10:47 pm

    Is this chart still accurate today in 2020? I believe if memory serves me correctly this is dated 2016???

    Reply
    • Jeff Kendrick says

      September 17, 2020 at 7:49 am

      Science doesn’t change so these numbers should be close in the real world. Do these numbers actually work in pretend physics (iRacing)? Probably not. You don’t see big stagger changes in the iRacing world any more. Lower stagger a little for loose conditions, and vice versa. Stagger is also a good adjustment for running different track temperatures. For a track temperature increase of 20° fahrenheit, my rule of thumb is to decrease front and rear stagger one click along with a few other small adjustments.

      Reply
  5. Scott Bolster says

    June 27, 2021 at 10:35 pm

    Just a quick observation: Trackwidth is not measured at the outside of the tires but between their centerlines. If you use the outside of the tires, you’re adding, using a SLM as an example, 10 inches. We do all of our circumference measurements on the centerline of the tire for checking stagger.

    Furthermore, anytime you get tech-ed at the track for trackwidth, they measure it at the center of the rim using the ‘Referee.’

    Camber usually changes this but in the grand scheme of things, the published trackwidth is good enough.

    A good place to get Trackwidth information is a track’s rulebook.

    Ours is 66″ Max so we run the max. You can look at all of our rules here: https://norwayspeedway.com/division-rules-1

    Reply

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