That GY KAMAX T has a "J" speed letter = 62 MPH.
Almost all European designed 17.5" low platform trailer tires with a "J" (18 PLY) rating also have a "J" speed rating letter.
17.5” sizes - 70 series
245/70R17.5 LHT 143/141
J (146/144 F) 789 803 248 258 360 2406 270 - - 6,75 7,50
(From GY truck tire data book).
https://www.goodyear.eu/uk_en/images...8p_ENG_web.pdf