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I figure wheel bolts are 12x1.5 so four 1.5 threads is 6 mm of engagement, half of the SCCA requirement. You are right it is reassuring to see that the wheels aren't going to fall off.

27Won instructions pdf includes a template to cut out and measure on your wheels to determine if a spacer is needed. 5mm is needed for OE wheels. No spacer needed for my winter wheels. You may not need a spacer with your new wheels.

Braking is much better! The brakes stayed cooler as well. The 27Won kit comes with street pads, I don't know what brand. No squeals at any time. Next year I might try switching pads for track days.

Pedal is firm, with good bite, but then I bled the brakes during the installation. Doing a track day this weekend,we'll see how the brakes work then.

Here is what I had to do so the wheels don't fall off. Install wheel bolts one inch longer, Cut closed ends of lug nuts. Looks pretty good, I think.

I have just installed the 27Won Big Brake Kit on a 2018 Civic Si with the OEM wheels. It required 5mm wheel spacers. There is 1 to 2 mm brake clearance with the spacers. As a result the lug nuts only engage 4 full turns instead of 7 or 8. This is not acceptable to me, especially for track and...