I found another sled for talking about tire tips. I am Japanese and moved to Tx last July. I talk about Japanese tire brand and difference.
-track condition
Almost all of Japanese carpet track use trinity sticky finger for additive or TC2-plus(petrol; painting liquid) from Dutch.
-tire
<GXX/kimihiko>
In above condition, the most high grip and popular tire is GXX soled by kimihiko-yano.
http://www.kimihiko-yano.jp/Product/...rt/gsearch.cgi
This tire is form. I test this tire in RSD with SXT3.0. This was not the best tire.
<S-compound/xenon>
At this point, S-compount for rear tire is the best grip and consistency.
<yokomo S rubber, kawada CXS, J-dush or other chemical smell tire>
These tire form tire with chemical process. Basic form is made of chloroprene copolymer.
These tires are not matching process, therefore before use it we need to match by ourselves.
<special compound/Ulti Z compound>
For low grip, outside paved track.
Ulti Z tire is discontinued. But the same tire is soled by kawada, P-compound.
-manufacturing
kimihiko, bomber, ulti, square,,,, most of them are from kotobuki-giken.
Kotobuki is tire gluing and matching company.
http://uf-tire.jp
Their wide variety forms are from Tabata. But now it maybe have some of other company.
http://www.tabata.jp/jp/index.html
So far, Xenon S-compound for rear is the best performance on SXT3.0/FastTrack carpet. But it will be change by other factors.