Autocross Class Questions

Maxnjana · 10-30-2021, 02:06 PM

Hey forum,

I just purchased a 2017 ZCP 6MT. It looks like this car is classed in BS in SCCA Solo. I need to buy wheels any tires and need to clarify the rules. Question is, can I run 18s since this is a ZCP that came with 20s? The rules say only +- 1", but since 20s are an option, can I get away with running 18s? The region I run with usually isn't strict but I would like to stay within the rules for division and national events.

CSBM5 · 11-07-2021, 04:46 AM

I've never seen an approved deviation to the letter of the rule. The car was built with the ZCP package and 20" wheels. Hence one would have to assume that 19" is the smallest legal diameter. However, there is a hook here...the fact that you could order the 437M 19" wheels as an option with the ZCP package. That hook might open the door to 18"?

Maxnjana · 11-17-2021, 10:38 AM

Thank you for the input. I just bought a set of used 19" 437s to run for autocross so there wouldn't be any question.

10-30-2021, 02:06 PM	#1
Maxnjana Longtime Lurker 7 Rep 30 Posts Drives: '17 M4 ZCP 6MT Join Date: May 2014 Location: Lexington, KY iTrader: (0) Garage List 2017 BMW M4 ZCP 6MT [0.00] 2019 BMW X5 4.0i X- ... [0.00]	Autocross Class Questions Hey forum, I just purchased a 2017 ZCP 6MT. It looks like this car is classed in BS in SCCA Solo. I need to buy wheels any tires and need to clarify the rules. Question is, can I run 18s since this is a ZCP that came with 20s? The rules say only +- 1", but since 20s are an option, can I get away with running 18s? The region I run with usually isn't strict but I would like to stay within the rules for division and national events. __________________
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11-07-2021, 04:46 AM	#2
CSBM5 Brigadier General 2721 Rep 3,335 Posts Drives: 2019 M2 Comp, 2011 M3, etc Join Date: Nov 2005 Location: Greenville, SC iTrader: (2)	I've never seen an approved deviation to the letter of the rule. The car was built with the ZCP package and 20" wheels. Hence one would have to assume that 19" is the smallest legal diameter. However, there is a hook here...the fact that you could order the 437M 19" wheels as an option with the ZCP package. That hook might open the door to 18"? __________________ Current Stable: 2024 G20 M340i Melbourne Red/Cognac 2019 F87 M2 Competition 6MT, LBB, slicktop, exec pkg 2007 E91 328i Silver, slushbox, Eibach fr/E93 M3 rear sway bars, ARC-8
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11-17-2021, 10:38 AM	#3
Maxnjana Longtime Lurker 7 Rep 30 Posts Drives: '17 M4 ZCP 6MT Join Date: May 2014 Location: Lexington, KY iTrader: (0) Garage List 2017 BMW M4 ZCP 6MT [0.00] 2019 BMW X5 4.0i X- ... [0.00]	Thank you for the input. I just bought a set of used 19" 437s to run for autocross so there wouldn't be any question.
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