[Yanbags]

Originally Posted by bpang1234

One thing to note, magnetic numbers will only stay on the car up to a certain speed then the air will lift them off. So they are super-fine for Autocross speeds but not so much for an open track day. I believe anything under 70-80 mph is just fine. Beyond that, I recommend putting some tape along the edges to ensure that air isn't able to lift them off the door as easily.

I use magnetic numbers and they held on fine hitting 140+ regularly at Watkins Glen

Maybe I'm playing with fire...

[Kairles]

Mine came with little tape strips. Dont think I went fast enough to really need them(115 in the Camaro, 125 in the M6).

[gotroost]

Originally Posted by Yanbags

I use magnetic numbers and they held on fine hitting 140+ regularly at Watkins Glen

Maybe I'm playing with fire...

Mine have worked fine many times at 125+. I have a rectangular background and numbers on top. Works just fine over clear bra. I just put them on a clean car before I go to the track.