I think the OP wants to to reduce the revs, for a given mph on the highway
He's not at all interested in offroad as he never ventures off tarmac, so lowering the gearing is of no interest
So he's considering fitting 17/40 or 39 to reduce the revs & so vibes at say 70 or 80mph
Would this work?
So many roads...........So little time..!!!
2005 BMW R1150GS Adv - Black
2005 BMW R1150GS Adv - Silver
2007 BMW G650 XCountry - Black