Downside to 120 / 70 / 16

you wont get that tire on the bike... (is a 17 :) ) why are you looking to change profile? 120/70/17 is stock size
 
probably means the other way around..

a 60 series will get You lower but you will have to lower the fender to make it look right..
 
the profile number is pretty simple..

120/70/17

120 is the tire tread width
70 indicates that the sidewall is 70% of the tread width
17 indicates the wheel diameter (ID)

if you go to a 60, it means the sidewall is going to be 60% of the tread area

so you end up with a "shorter" or "lower" profile..

I am not sure how this would affect the handling of the bike but on cars, it tends to "stiffen" up the tire .. less sidewall, less deflection on corners..
 
Is there any downside to running a 70 instead of the 60 series?

With the 70 series the front of your bike will sit almost .5" higher than it does with the 60. Im not a huge corner carver, but i think going to the 70 series will make the bike turn better too. So unless your into all out drag racing I wouldnt get another 60. I have one on my bike and I think it looks funny.
 
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