Tire changes again?

[kbrewmr2]

I just read the treadwear rating is a 40.
I'm no tire expert but if the RA1 has a rating of 100, how is a treadwear of 40 going to last equal to or longer?

treadwear ratings are more about marketing than actual grip levels - easy to skew up or down depending on who they want to sell to.

just ask any autocrosser on "140" treadwear tires....