I've had that question too but can't seem to find a clear cut answer on a bikes weight (for example) to differentiate between GT and non GT. Kind of baffling ...
As
@Axel Johansson shows there is an extra layer layer in the tire but again no clear cut guidance as to which bikes should use the GT tire.
My opinion, for what it's worth, is the GT would be used for FJR's, Concours class bikes and above. I've very successfully ran Road 5's on my V1K, even though there is a GT Road 5 version available. [Edit - sorry, there is a Road 4 GT and non GT version, but no GT version for Road 5] Also thinking about trading up to Road 6's this riding season - will be non GT versions.
More details on Road 6
Michelin Road 6 and Road 6 GT First Look: A new year brings a new tire designed for sport-touring motorcycles, with new ADV sizes.
ultimatemotorcycling.com
Michelin spec sheet attached. Two additional links to a distributor that shows the same max load weight for GT and non GT tires (assuming website is correct)
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