150 means the profile of the tire
70 is the ratio aspect meaning 70% of 150
17 simply means 17" rim
Super4 VS have a 4" rear rim. The biggest profile tat u can fit in is a 150 profile tire, however this will slow the way the bike turn.
OEM size will be 140 70/17. base on the profile, u can see tat it is not mean for agressive riding.
If u like to ride hard, u can use either 150 60/17 or 140 60/17. FOr me, i'll go for 140 60/17, it pays dividend when u encounter BMW corner at PAsir GUdang.
using a 150 profile, u sould take note of the clearance between your tire and your chain guard. when the tire is heated up, it can expand by 7 to 8 mm.
tire choice depends on how u ride ya machine, its very subjective.