Originally Posted by
RedBullFiXX
Monti is the Yoda of BSR foam tire explanations, will see if I can get him in here to clear things up, but this is how I view the foam families
Black, White, grey, Yellow are (Full Synthetic)
Front 2X Blue / Blue, are new foam (Synthetic, chalk like when trued)
Rear Blue / Green (Semi synthetic)
Magenta, Pink (Rubber based Japan foam)
This is pretty close, I must note I'm not a fan of the synthetic/natural term a lot of racers use. Mainly because I don't understand what is ment by it. I just like to look it as "families" or types of foam.
Blk and dbl blue are about the same firmness. Blk has less grip than dbl blue. When or if I run Blk fronts I dope them full not to mention they wear faster .
Using a durometer it almost point less since there isn't enough foam let alone once trued. Just note which tire is firmer or softer and leave the grading to the mgf 😄
Monti