will it hurt to change out my 120/65/17 up front to a 120/70/17? its not a drastic change so i don't think it will effect it much

 

a 70 series will be slightly harder to initiate a turn with (hardly noticable coming from a 65 series tire), and be slightly more stable in a turn than a 65. 60 series turn in quick, but are less stable. that's kinda why mfr's started making the 65's, as a middle ground.

most street riders would never notice the difference.

 

k thanks, looks like i'll be getting the 70, if the guy still has the tires