I think several companies are making spec tires intended for World GT
CRC
http://teamcrc.com/crc/images/empori...edia/52324.jpg
I have tried these on my wide pan and they were very good.
BSR
http://www.lefthander-rc.com/catalog...sort=3a&page=2
(I think) Jaco may be making a spec tire (lilac)? I don't see it on their main web site.
I have recent experience with 4 cell. This is not the way to go. Two of four new packs were deteriorated on purchase. Could not get a reliable supply of good cells. One supplier, Trinity, still has a weak four cell pack return after 5 months and has not sent a replacement.
John