Another thing if you corner hard often then they will wear down very quickly. Mine became illegal after about 7 months(and that was only really weekend use ) . Not good but worth the enjoyment again IMO. On the right car with the right driver they are a very good mod.
just to add. in corners they are very good. you dont feel "woobly" like normal tires wil do. will be more steady as there walls are much harder!
Dont think you can get the Eagle F1s in 15s any more.