8 replies to this topic

[tLinder]

My car came with a spare set of Kosie K-1 wheels, 38mm off-set. Should I buy spacers (Miata-Cage) to make them 30mm or 25mm, or does 8mm+ make a big difference to regional level yuck monkey like myself?

[James York]

Double check the GCR for the maximum spacer width allowed. I think you can 38 mm offsets to 25 with the rules as written, but I can't remember since I run 30 mm offset wheels.

If you really are just out to have fun and not shooting for the podium, you are probably fine as you are.

[Zauskycop]

My car came with a spare set of Kosie K-1 wheels, 38mm off-set. Should I buy spacers (Miata-Cage) to make them 30mm or 25mm, or does 8mm+ make a big difference to regional level yuck monkey like myself?

Yes you can run a spacer, as that is how my car came, and I have been doing it. This year I am ordering 25mm offset wheels as I found out that those spacers weigh 1.2 lbs each! That should be worth at least 2 seconds a lap at Road America.

[Mike Collins]

Unless you have done tons of other finite details to the car you will never be able to tell which wheels and tires you are running.

[tLinder]

Good enough for me, no spacers, "run what ya' brung!" Thanks for quick feedback.

[Johnny D]

13mm (I believe, Check the GCR) is the max offset you can run, making your 38's 25's.
You may also need the long studs for that.
J~

[tLinder]

13mm (I believe, Check the GCR) is the max offset you can run, making your 38's 25's.
You may also need the long studs for that.
J~

GCR Spacer Info:
... 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.

[Johnny D]

Yep.
13's only on the 38's or smaller.
5's on the 30.
Or you'll go over legal tread width, besides rubbing the fenders.
J~

[Muda]

Use them for your rains and buy new wheels with the offset you want.