The easy way to remember is this- EVERY 1.6 Sentra came with 175/70/r13's.
The SE-R came with 185/60/r14.
Hope that clears it up. Also- going from a 185 series to a 195 series without reducing the sidewall profile will cause your speedometer to read wrong. The rule is for every 10mm wider you go, you need to reduce the sidewall 5%.
To run a 195 series without speedometer error, you'd have to use a 195/55/14. 205 series would be 205/50/14. And so on.
Are you sure you have an E?? A sure fire way to know (from the exterior) is if your bumpers are generic gray (as opposed to body color for the XE). Yes I know it says E or XE on the rear but those things sometimes come off. If you have PS odds are it is not an E. Also look on page 9-8 in your owner's man and it lists P155/80R13 as well as P175/70R13. (My door label also lists
Just thought of something...maybe 175 were an available option on the E? I'll have to check my brochure when I get home.