Probably, yes. There are some recommendations on rim width vs tire width - I'll post a link. You have to scroll down a bit.
If it's the number at the start of the tire ID ( eg 175/70/R/13 ) then it's the width in millimetres.
No, the 185 70 r14 tire cannot be substituted for a 175 65 r14 tire. The 70 series tire has a larger diameter and is not recommended that you substitute on a 65 series tire.
Yamaha IT 125, 175.
Yes, you can use a replacement tire of 175-65-r15 for a 195-55-r15 rim.
175-70-14
175/65R14
175/70r13
175/65/14
No
The stock tire size is P175/65R14 (or 175/65/14)
175-65-r13
175/70/R13