Wheel width vs. classification points

[Hung-Jen Hung]

Classification system is closed now so I cannot check how wheel width/diameter affects points. Anyone knows how many points by running 0.5” wider and 1” smaller diameter wheels?

Hung

[Hung-Jen Hung]

Another question is how points get affected running front sway bar and RE71R

[Bill Richter]

Some info here: https://www.bmwautocross.com/wp-content/uploads/2019/04/2019-classificationFAQ.pdf

[Dennis B]

Diameter does not influence points. Width is 1 point per 0.5″. Front sway is 2 points IIRC..

RE71R is “summer tire” classification (no points)

• This reply was modified 5 years, 5 months ago by Dennis B.

[Hung-Jen Hung]

Thanks for the info. I was checking the pdf Some info here: https://www.bmwautocross.com/wp-content/uploads/2019/04/2019-classificationFAQ.pdf
The weight for F8x M3/M4 seems off. 3375 lbs for M3 and 3420 lbs for M4 seems 200 lbs lighter than it’s actual weight.

[Hung-Jen Hung]

https://www.bmwusa.com/vehicles/4-series/m4/pricing-features.html

CURB WEIGHT – MANUAL TRANSMISSION (lbs)
3625

CURB WEIGHT – AUTOMATIC TRANSMISSION (lbs)
3685

This needs to be addressed.

[Hung-Jen Hung]

The base point for F82 M4 should be 57 not 62.

[Jeremy Nuger]

The weights listed there for all the cars look lower than the bmw published weights. I’m guessing they’re using different sources. Maybe it’s dry weight vs wet weight. My car is also listed in that doc as being a couple hundred pounds lighter than the bmw published wet weight.

[Author]

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