I am currently looking for new tires and I came across some information that I felt was good to share. I know many riders of heavier bikes that exclusively buy GT spec tires - currently this only includes the Bridgestone T32 in ST1300 sizes. I reached out to Dunlop about the Roadsmart IV, as they sell a GT spec and SP spec in Europe, but do not have that designation in North America.
Here was their response:
"Thank you for reaching out to Dunlop Motorcycle Tires. The Roadsmart IV available in North America is equivalent to the European GT version. The Roadsmart IV is suitable for a 2003 Honda ST 1300 and meets the requirements."
Perhaps this was well known, but I thought it would be good to share if anyone was scared off since the Roadsmart IV is not listed as GT spec.
A pair of Roadsmart IV's can be had for $163.95 (front) and $185.95 (rear) + tax and shipping in Canada (so CAD). They are quite an attractive choice at that price.