I have/had the same issues when I installed my Shinko 705 about a year ago. https://www.nc700-forum.com/threads/front-tire-wobbling-on-35-mph.15940/I mounted my new Shinko 705's over the holiday break. This week was my first chance to go for a ride.
The tires feel really different from normal tires. The bike seems to want to fall into turns really fast. This will take some getting used to.
The bad: I now have a shimmy in the handlebars. It is really noticeable around 20mph. When I lift my hands from the bars, the bars wobble back and forth an inch or two at the bar ends. When holding the bars, I can feel the vibrations very lightly. At highway speeds, the vibration is there, but the handlebars don't wobble at that speed. I can see the vibrations in the mirrors at all speeds.
I elevated and spun the front wheel by hand and the bead is set correctly all the way around on both sides of the tire. Also, looking from the side and from above, spinning the tire shows no indication of being out of round. I wouldn't expect a balance issue, as that would seem to produce an up/down vibration instead of a side to side wobble.
Is it the big blocks in the tread pattern that causes the shimmy/wobble? Or do you think I have a bum tire?
Because, I'm pretty sure, you rode it on the street 100% of the time. Shinko 705 are 80%-20%.... The rear tire was bald in middle...
I would actually recommend more Pilot Road tires, 4 or 5, doesn't matter. Still the #1 rubber.... And installed Pirelli Angel GT 2's. I got 10,000 miles out of rear tire...
This is so far from the truth. As you said, it's not AT, but check YouTube videos what are NCs capable off, and where NC owners taking their bikes - you would be surprised.... Since the NC is limited to more paved roads...
I was not impressed by the Road 4. Didn't give me more mileage than what I had used previously, and for me didn't handle as nicely/feel as good. What I'm using now also handles better, but don't know about the mileage yet. So I am glad there are other alternatives, and that one venue's #1 is just another choice elsewhere.I would actually recommend more Pilot Road tires, 4 or 5, doesn't matter. Still the #1 rubber.