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Author Topic: 1990 track width
roxfatal Verified Driver
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Hello All,

Does anyone know the track width from the factory for a 1990 SM? If you have team dynamics with a 25mm offset will that make the box a bit off? If you have the ability to use spacers would it be best to get the width equal front to back or do these cars like it a bit wider up front?

Thanks

d mathias Verified Driver Made Donation to Website
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Year : 1991
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http://cms.scca.com/documents/Club%20Forms/2010%20Tech%20Forms/sm-jan.pdf

wheel Verified Driver Made Donation to Website
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d. The front track shall not exceed 1450 mm. The rear track shall
not exceed 1465 mm for the 90-97 model years and 1475 mm
for the 99-05. Aftermarket wheel studs, lug nuts, and wheel
spacers are permitted. If spacers are used they shall be no
greater than 13mm and equal per axle.

roxfatal Verified Driver
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quote:
Originally posted by d mathias:
http://cms.scca.com/documents/Club%20Forms/2010%20Tech%20Forms/sm-jan.pdf

I know the rules and I have up to the maximum 13mm spacers with 38mm offset wheels. I was just wondering if anyone knew the stock widths as a baseline. I heard that they are different front to back.

Keith in WA Verified Driver Made Donation to Website
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Fully bone stock:
Track Width, Front (in): 55.5
Track Width, Rear (in): 56.2

--------------------
Keith Novak
(Will work for tires)

d mathias Verified Driver Made Donation to Website
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[edit: Someday I'll learn to avoid these threads.]

Keith in WA Verified Driver Made Donation to Website
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I read it as legal the way it's written now. I think it was written differently before. They must be equal per axle...same on both sides of an individual axle. Not on all 4 corners.

--------------------
Keith Novak
(Will work for tires)

roxfatal Verified Driver
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Thanks Keith that makes total sense. Now I think I know what to do [Smile]

iambhooper
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how is the track measured? from outside to outside of each tire, hub? also, since the car came with a 2 sets of Team Dynamic's, how do I know the offset of the rims?

thanks!
hoop

--------------------
hoop
'91 Spec Miata
'90 NA Beater/Track Day car
'06 RSX Type S

Motor City Hamilton
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http://www.usacomp.com/terms.htm

https://www.rsracing.com/tech-wheel.html

   

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