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One thing you need to be aware of is the change in ride height when fitting the 120 tyres. Incase you dont already know the 70 and 60 refers to the aspect ratio. It expresses the height to width ratio as a percent. A 70 aspect ratio means the tire's cross sectional height is 70% of it's width.

So... The 110/70 stock tyre has a profile height of 77mm. If you fit a 120/70 you will raise that profile to 84mm and conversely if you fit a 120/60 you will lower the profile to 72mm.
So if you want quicker handling go with the 120/60 but you will get a slightly harsher ride with the shorter side walls as they flex and absorb less.

Our 'ol mate SDSS would do a geometry change correction when fitting non OEM tyre sizes but that's a whole other story... 😄
 
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