Truth be told the dual sport is still a nascent market in India and the tire range is just a mix of potpourri with weird combinations and thread patterns. If only the Duke ADV was launched in the 110/70 and 150/60 R17 Tourances, Metz would have sold the tires like hot cakes. But taking a leaf of the ADV, just look at their tire sizes, front is 100/90 and rear is 130/80. My hunch is that it's the same old rear rim with a better fitting tire now opted by KTM for offroading.
I'd recommend use 100/80, the RALCO and I'd surely say give it a try. You're only 10 short of the ADV tire spec.

Cheers!
VJ




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