Oversize .820" x 3/32" axle.
These tires are actually .830" - .835" OD, but you'll probably see in my photo, at that dia. they are just short of "cleaning up", 100%.
T9S3N* - premium rubber version of small .400" hub / 8703PP
T9M3N* - premium rubber version of medium .470" hub / 8713PP (hub formally known as
$13.29 pair
This is the premium, dense rubber, that racers seem to be so excited about in this thread;
http://slotblog.net/...ber#entry691672
It definitely has a different appearance, has a firmer spongy feel, and as one would expect, it's heavier.
A premium small pr. of tires, weighs 5.5G a pair, compared to it's non-premium counterpart, 8703PP, which weigh in at 4.7G per pair.
I don't have any personal experience with this rubber, but I would guess, but not stake my life, that it's appication would be the same as it's similar stock #.
IOW, for Flat tracks and situations, where you are looking for maximum bite.
This flash photo shows the tighter pore structure, of the premium rubber, on the right.
The very minor, "not 100% cleaned up" issue, mentioned in the above text. You can see sort of a smiley face at 3 o'clock. IIRC, it is mostly with the medium hub tire.