I never really put much thought into what would happen if I got a flat tire. Well today it happened. I pulled over, jacked up the car and removed the wheel. Just as I was about to put the donut on, I realized how will that be able to fit over my front BBK? Simple answer, it won't. I lucked out, I just happen to have a 30 mm H&R spacer. This gave me just the right amount of clearance. I don't believe a 20 mm spacer would have been enough.