doubled

I'm confused with your thinking here, guys. The "60" or "70" is the aspect ratio. A 60 would be shorter than the 70 (so yes having a similar effect as raising the forks), and therefore provide a flatter surface and less sidewall for cornering. I would think turn-in would be slower and there would be slightly less surface area for grip when cornering. I'd be inclined to stick with the OEM size and buy the type of tires that are right for your style of riding.

My mechanic (not because I'm lazy; just don't have the know-how): Changed brake fluid, clutch fluid, cut down rear brake pushrod to lower brake pedal and accomodate BLS lowering blocks. Me: Change coolant, oil and filter, plugs, add vfrness and fuseblock from Tightwad, fill tank, add stabil, wash, hook up to Tender and cover with blanky. Now wait 'til spring. Sigh.