I used to do the HVAC service at the local Firestone plant not far from here. Rubber comes in from wherever and its not black!! They add the black and run through a lot of processing before it gets sent down to where they made the tires.
I think the OEM tires are no longer made so that is when I found those Wanda branded ones. Turns out they and Kenda and the ITP ones are made either in China, Taiwan or Vietnam. The Wanda is closest to the OEM Bridgestone, that I could find. Weights on all are pretty close within 2 lbs anyway.
yes but still all rubber is NOT the same make up, its chemically made, and mixtures are NOT all the same for every rubber in a tire
I worked for 20+ yrs in a multi billion dollar a yr company and we had rubber squeegee's for some machines that had over 150 different rubber make ups, differences were very VERY slight, to do the exact same job, and all them differences would add up to some lasting longer than others, some being Harder( rubber durometer scale reading) or softer and , it totally changed the way the machine would work!
the exact same thing is with tires, rubber on "X" brand and model tire, maybe different to tire"Z" even from the same company!
its why there are snow tires(softer rubber) longer mileage tires, stiffer side walls, different compounds grab different things differently and wear differently, flex differently and so on!
your time doing HAVC work at firestone, didn;t scratch the surface of what a is going in in there mixtures for there tires, and I BET , many of there mixtures are patented too!, meaning other company's cannot use the same mixture without there permission and vice versa!
OEM ATV makers tend to use the cheapest junk they can get ina tire and they also tend to use the SOFTEST tire they can, to get a smoother ride out of there atv's
SPORT atv's being the exception and maybe specifically made MUD machines that come with better tires from the get go
but basic atv's tend to get JUNK stock tires, and one of the very first things buyers get rid of!
if you do NOT trail ride much, and sty on your home lands, stock tires are all many need
but those that venture far and wide, soon realize how weak stock tires are and want out of them!