Fastlammy is that one new or has it endured a bunch of landings before it became unsuitable for an airplane? I would caution you against running used ones since you will have no idea what they have been through.
We have run our airplane fronts to 246 without issue, they were new and have been shaved...
unshaved versions in the past have run in the 220s with no problem. If you look at the tire on the front left you will see it has some fabric showing, it has looked like that for the last 12 years, it is a fabric tread tire, we shaved the other one first, then shaved this one to the same number. A couple of layers of the fabric appeared on this one... go figure. The tires run cool, we do not run them at max rated pressure, we run 150 psi in them with a tube. When you shave, just go to the bottom of the grooves.
As a side note, we ran over a sparkplug years ago and punctured a tire, all the air was out, noticed it after a 220+ run when we were loading the car on the trailer and wiping salt off the tires, don't know when in the run it happened...