Re:URGENT MEMBERS PLEASE READ 3 Years, 8 Months ago
My email reply from Mike Burris,
To get accurate and repeatable durometer reading two things have to be considered. First of all the temperature of the tire and second the air pressure and rubber thickness. That sound complicated but its pretty simple if you have something to compare to. To begin with if you had a mounted tire (20 psi)and the rubber temp was about 70/80 deg then the B44A usually reads about 58 and the B55Aís about 62. Keep in mind that a durometer measures deflection (not penetration) so if the temp goes up the rubber gets softer and if you drop air pressure then the needle will deflect more and get a softer reading even though the compound hasnít changed(Also keep in mind this applies to all tires and rubber products not just ours). The best thing to do if you are looking to police the hardness is to take a new tire and mount it and leave it out side so it is the same temp as the competitors and do comparison checks instead of shooting for a specific number. (it is best to check the outer shoulder of the tires because this is where the least wear takes place) Once you get the hand of it the whole deal becomes pretty routing.
Bottom line is B44A is 58 and B55A is 62.
If you have any more questions email or call me and Iíll be glad to help you out.