Looking at a Vladivostok to Europe trip on my KLR650 and will need new tires at some point. Would prefer to lighten load by not bringing them along if they can be sourced along the way. Route is very uncertain, thinking Russia-Mong-Kazak-Russia-Turkey. Front is 90/90x21 and rear is 130/80x17. I read one RR where someone had a hard time with the 17"rear.