I have been running the Avon Valk 70 series rear tire for awhile and like it a lot. If I do the complete Traxxion suspension upgrade, will I have to go back to the 60 series tire? I can be happy with either, but if there's no compelling reason to switch, I'd rather go large. Bonus question: Will I be making a mistake putting over $2K into a bike with 75K miles? I plan on putting another 75K on it before I get another.