Hello Wingracer, i learned english in Wales, that' s the reason for writing "tyre".
From Wikipedia; tire (American English) or tyre (British English).
I really wish you guys could personally test my additives, there is no better way to promote them. :-).
If you have any questions, please feel free to do so, here or better still on my Facebook profile;
https://www.facebook.com/roberto.pezzini.12
Excuse any eventual mistakes of writing, after all i am an italian mother tongue.
nene 805, the answer to your question is directly from me.