yea man, massive sidewall. Personally id only ever fit a 205 to a 13 inch rim if it was 9 inches wide :p
You could easily get 175/50's or even 60's on them without a sweat. A 175 on a 7 wont have a lot of stretch on it either.
dooo ittt
![](http://datsun1200.com/uploads/smil49ca0afcda1b0.gif)
edit: heres a 175/60 on a 7 and note the lack of stretch. The sidewall is level with the rim face instead of bubbling over it (ewww).
![](http://datsun1200.com/modules/myalbum/photos/11200.jpg)
![](http://datsun1200.com/modules/myalbum/photos/11204.jpg)
and with the valley in the watanabes being close to the rim edge there shouldnt be any problems what so ever with getting them on
![](http://datsun1200.com/uploads/smil49ca0afcd90b5.gif)
stretch on a 7 would be a 155 or 165.