I have 4 hpi Pirelli tires. They have been through some mud so they are a bit dirty even with a toothbrush. Anywayz i gotta quiz/question for u people. People with good eyes this might be one for u. (Hint 2 of them are hard and 2 are soft compound tires. they all have hard inner foams but somehow 2 of them got softer than the other two) See if u can figure it out. Took myself forever after i opened em both up and forgot which ones where which. I still am not sure myself but when i ran it it seems right. If u got backup to ur answer feel free to state it. Or if u have a surefire method to finding out the tire compound tell as well. I don't want my tires to wear the way i haven't planned them to. I have that doubt in my mind while running it. I just want to get rid of it