Slightly smaller tire, would you do it?
At the moment, I am staying with Ricardo in Quito, Ecuador. My V-Strom 650's rear tire is near its end. I need a 150/70 R 17 69H. My only options are a smaller 140/80 17 Pirelli MT60 at $103, including mounting or a OEM Bridgestone Trailwing in the correct size costing a whopping $260 with mounting.
Current plans are to head down the west coast to chile and possibly Argentina if it doesn't get to far into winter. Also would like to do a side trip into Bolivia's Salar de Uyuni and exit into Peru's Atacama to San Pedro(I think thats the town). So there will be some loose and very loose surfaces and possibly some mud.
What do you think? Should I go for the "Deathwings"? I like them for pavement but not so much for looser surfaces, for obvious reasons. If I go for the slightly smaller Pirelli, is it going to effect the performance more than making a quicker lean into a turn? Any thing else I should worry about with the Pirelli?
Any advice is greatly appreciated