Originally Posted by
McLarenFan
We run with silvercans and we are NOT allowed tire additives so it makes a tire choice a bit more critical.
I have no experience myself in that case, but if I had to run without additive, I would definitely look into nitro tires. Hardness apart, their composition is much better suited to situations where you can't use additive, partly because of their amount of rubber and size of the alveoles I think. For the right width you'll have to look for tires aimed at the now dead 235mm nitro class.