Hi Pampas and welcome to the forum. Could you update your profile with your location? - makes it easier to understand the context of some posts.
I can't answer your question specifically but am 99% certain that you could safely go to 265 without any issues.
Certainly the Tyre Bible (http://www.carbibles.com/tyre_bible_pg2.html) states that: "If you want the fat look but don't want to go bonkers with new wheels, you can oversize the tyres on the rims usually by about 20mm (to be safe). So if your standard tyres are 185/60 R14s, you can oversize them to about 205mm. But make sure you recalculate the percentage value to keep the sidewall height the same." (i.e., if you stick with 35 profile and increase tyre width, you'll end up with an increased diameter/rolling radius which may put out your speedo/odo readings by more than the allowable percentage). There's a calculator on the site to help you work this out.
I'd drop into my local tyre dealer and ask them for their opinion also?
I can't answer your question specifically but am 99% certain that you could safely go to 265 without any issues.
Certainly the Tyre Bible (http://www.carbibles.com/tyre_bible_pg2.html) states that: "If you want the fat look but don't want to go bonkers with new wheels, you can oversize the tyres on the rims usually by about 20mm (to be safe). So if your standard tyres are 185/60 R14s, you can oversize them to about 205mm. But make sure you recalculate the percentage value to keep the sidewall height the same." (i.e., if you stick with 35 profile and increase tyre width, you'll end up with an increased diameter/rolling radius which may put out your speedo/odo readings by more than the allowable percentage). There's a calculator on the site to help you work this out.
I'd drop into my local tyre dealer and ask them for their opinion also?