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Yep the 705's are great for bikes that mainly see the road.
If you never plan on leaving pavement at all, then you can go one step better and put actual road tires on your bike.
As far as size and fitment. 120/80-18 and 90/90-21 are the exact sizes I ran on my 705's and I had no fitment issues at all. Plenty of room. If you want to stay true to the rear tire diameter, then a 120/90-18 is almost the same exact diameter as a 110/100-18. 120/80-18 works just fine, but the decrease in diameter is effectively the same as going up 1 or 2 teeth on the rear sprocket, so you may need to adjust for the size difference.
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