They should have a mold number next to the bead on the backside of the tire. The mold number will give you a predictable size every time. With the tire shortage, there hasn't been much inconsistency in compounds. But when you get both lefts from the exact same mold and rights from the same mold. They will be within 1/16" - 1/8" every time. Every mold is unique and they hold the internal windings of the carcass completely different from mold to mold. There can be a 1/4 lbs weight difference between molds numbers. Simply because of how the mold is designed. You can also choose which mold has thicker sidewalls or a little more contact patch. There is a ton of tiny thing that can add up to a big advantage. I am working on getting this brand new LEFTHANDER MODIFIED I found that was never completed, finished to run New SMYRNA. When I raced super late model at Orlando SPEEDWORLD back in the 2000s. I spent a ton of time working with the Goodyear and the Hoosier tires from DESOTO speedway.. I was a genius when it came to tire preparation. Jim excited to get to race again. I broke my neck in 2005. So im finally getting to get back on track... thank God
They should have a mold number next to the bead on the backside of the tire. The mold number will give you a predictable size every time. With the tire shortage, there hasn't been much inconsistency in compounds.
But when you get both lefts from the exact same mold and rights from the same mold. They will be within 1/16" - 1/8" every time. Every mold is unique and they hold the internal windings of the carcass completely different from mold to mold. There can be a 1/4 lbs weight difference between molds numbers. Simply because of how the mold is designed. You can also choose which mold has thicker sidewalls or a little more contact patch. There is a ton of tiny thing that can add up to a big advantage. I am working on getting this brand new LEFTHANDER MODIFIED I found that was never completed, finished to run New SMYRNA. When I raced super late model at Orlando SPEEDWORLD back in the 2000s. I spent a ton of time working with the Goodyear and the Hoosier tires from DESOTO speedway.. I was a genius when it came to tire preparation. Jim excited to get to race again. I broke my neck in 2005. So im finally getting to get back on track... thank God