Hi. I know, I know, there have been MANY threads related to tire replacement. I have looked at most of them and can't find out what size front tire to get....I am going with Pirelli MT66 170/80 for the back tire but have no idea what size to get for the front. And, if you are not flaming me for continueing to beat the dead tire horse, lol, can you be specific about exactly what model/size to order, rather than saying "stock"? Thanks so much.