Definitely change. I've just done a 2600 from Spain up through France, on a tour, and several folks underestimated the wear and tear their tyres were going to get on the abrasive European roads, not to mention them gritting everywhere, (including hairpin ascents). 3 new tyres had to be fitted whilst out there, and another one, a 3 day old Roadtec 01, suffered a massive impact and was irreparable. Bike was recovered to nearest town where fortunately there was a Kawasaki dealership who replaced it first thing in the morning. JMO