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> Street Class mods, How to determine standard wheel size?
Between Two Cone...
post Nov 10 2019, 02:40 PM
Post #1





Group: Autocrosser
Posts: 4
Joined: 9-November 19
Member No.: 236647



Hi all!
I'm new to the area, new to Autocross, and new to this forum. I'm excited to get involved at first in the Street Class. As such I'm not wanting to accidentally move myself up into another class. My car is currently very stock but I want to make it as competitive as possible. I've read and re-read the rules a few times already. I have a pretty good understanding of the allowances but I'm not quite sure what is meant by "standard". I bought the car used and I'm not 100% my car came with the current wheels.
More specifically, what are standard wheels?

What sources are used to determine what my car comes with as standard wheels?

I have a 2012 328i. I've scoured the interwebs and found multiple sites claiming three wheel sizes for my model and year.
8x17 ET34,
7x17 ET37,
7x16 ET31

I understand I am allowed to go +-1" in diameter and +-7mm in or out....but which wheel is "standard"?

Thank you and I'm looking forward to meeting you all.

Also, i could not find a simplified list of allowable street mods so i made one, please let me know if its wrong or if there is a better one out there. (attached)

Attached File(s)
Attached File  Allowable_Street_Class_Modifications_simplified.pdf ( 82.16K ) Number of downloads: 13
 


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-Mark Perez
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SMeyers
post Nov 10 2019, 02:57 PM
Post #2





Group: Steering Committee
Posts: 8987
Joined: 6-December 02
From: Glendale AZ
Member No.: 4



Standard size wheels are only what the MANUFACTURER says came on the car from the factory. Website data very erroneous.

Roll cage for Street Class? Really? (Although lately I'm not one to talk, am I?)

You can upgrade brake PADS

Thinking NO on shifter

Aesthetic Body kits.....careful here. SCCA considers almost anything a performance advantage.

Steering wheel.....these days, must keep all air bag stuff, I wouldn't go there. No need.


Anyone else?


--------------------
Scott Meyers
2012 Honda Civic Si - H Street
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Between Two Cone...
post Nov 10 2019, 09:06 PM
Post #3





Group: Autocrosser
Posts: 4
Joined: 9-November 19
Member No.: 236647



QUOTE (SMeyers @ Nov 10 2019, 03:57 PM) *
Standard size wheels are only what the MANUFACTURER says came on the car from the factory. Website data very erroneous.

Roll cage for Street Class? Really? (Although lately I'm not one to talk, am I?)

You can upgrade brake PADS

Thinking NO on shifter

Aesthetic Body kits.....careful here. SCCA considers almost anything a performance advantage.

Steering wheel.....these days, must keep all air bag stuff, I wouldn't go there. No need.


Anyone else?


Thanks for the reply Mr Meyers. Could you tell me where to find the manufactures specs? As in, what site or docs do the vehicle inspectors use?
As for the stuff on the list, Iíd never do half of it, I was just taking notes as I read through the rules. Weighted shifter is actually useful. Steering wheel? I might upgrade to a nifty M series cause itís pretty. As far as break pads, I read you cannot change weight, thickness, density, or materials of any wearable item.


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-Mark Perez
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HarryB
post Nov 11 2019, 10:40 AM
Post #4





Group: AZ Region Member
Posts: 1149
Joined: 14-January 03
From: Prescott, Arizona
Member No.: 36



Looks like the estate wagon version of the 328i was tbe only one fitted with 16" wheels.
The optional wheel was the 17.
The sedan came with 17x8, and the optional upgrade was the 18x8.
SCCA allows +1 or -1
So wheel wise, 16, 17 or 18 inch wheels are allowed with a max width of 8".


--------------------
Harry Berzes
Prescott, Arizona
Golden Dogs Racing
16 Mazda MX5 Jet Black Mica GT
All leather, way too stock. For now.
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SeanDickinson
post Nov 11 2019, 03:23 PM
Post #5





Group: Autocrosser
Posts: 18
Joined: 2-October 16
Member No.: 175606



QUOTE (Between Two Cones @ Nov 10 2019, 02:40 PM) *
Hi all!
I'm new to the area, new to Autocross, and new to this forum. I'm excited to get involved at first in the Street Class. As such I'm not wanting to accidentally move myself up into another class. My car is currently very stock but I want to make it as competitive as possible. I've read and re-read the rules a few times already. I have a pretty good understanding of the allowances but I'm not quite sure what is meant by "standard". I bought the car used and I'm not 100% my car came with the current wheels.
More specifically, what are standard wheels?

What sources are used to determine what my car comes with as standard wheels?

I have a 2012 328i. I've scoured the interwebs and found multiple sites claiming three wheel sizes for my model and year.
8x17 ET34,
7x17 ET37,
7x16 ET31

I understand I am allowed to go +-1" in diameter and +-7mm in or out....but which wheel is "standard"?

Thank you and I'm looking forward to meeting you all.

Also, i could not find a simplified list of allowable street mods so i made one, please let me know if its wrong or if there is a better one out there. (attached)


I did notice in there you put in ride height as being a no. If the car comes with adjustable ride height on factory components, it is then legal to adjust the ride height.
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Between Two Cone...
post Nov 11 2019, 03:57 PM
Post #6





Group: Autocrosser
Posts: 4
Joined: 9-November 19
Member No.: 236647



QUOTE (SeanDickinson @ Nov 11 2019, 04:23 PM) *
I did notice in there you put in ride height as being a no. If the car comes with adjustable ride height on factory components, it is then legal to adjust the ride height.


Thatís what I found too! Unfortunately my car doesnít come equipped with it.


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-Mark Perez
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Between Two Cone...
post Nov 11 2019, 04:02 PM
Post #7





Group: Autocrosser
Posts: 4
Joined: 9-November 19
Member No.: 236647



QUOTE (HarryB @ Nov 11 2019, 11:40 AM) *
Looks like the estate wagon version of the 328i was tbe only one fitted with 16" wheels.
The optional wheel was the 17.
The sedan came with 17x8, and the optional upgrade was the 18x8.
SCCA allows +1 or -1
So wheel wise, 16, 17 or 18 inch wheels are allowed with a max width of 8".


Harry,
According to my owners manual, the wagon came with 16,17,18,& 19.
Therefore (+-1Ē) 15,16,17,18,19,& 20 should be allowed per Solo rules.

Iím still struggling to find a manufactures document to state the wheel sizes.


--------------------
-Mark Perez
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Dave H
post Nov 11 2019, 07:02 PM
Post #8





Group: Steering Comm., voting member
Posts: 1380
Joined: 27-June 07
From: Chandler, AZ
Member No.: 1122



I think the trick is, did anything else change with the upgrade to 18" wheels? To be legal for stock, you'd have to change to everything that was included in the upgrade.


--------------------
Dave Hurt
Director
Chief of Course and other things
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hatrick6
post Yesterday, 05:39 AM
Post #9





Group: Steering Comm., voting member
Posts: 3095
Joined: 11-August 06
From: North Phoenix, AZ
Member No.: 710



Like Mark said, any wheel size that came from the factory is fine, even + or -1", also there are really only 3 "mods" allowed in Street: performance shocks (they must mount in the same way/place,), one away bar (not both) and modifying the exhaust from the car back is allowed.


--------------------
"Maybe I should just buy a 240 and become a mad tyte drifter." - Hitler
Josh Johnston
AZ Region Director
1997 Honda Civic HX - STC
1995 Nissan 240sx SE - STC
2004 Mini Cooper - STF
2006 Mini Cooper JCW - DS
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