I take it whoever fitted the tyres didn't say anything about the 255 being too wide on 8J rims?
How does your car look now with them sizes? Theres a 14mm diameter difference front to back... any chance of a photo?
I really dont buy into the whole insurance thing, If we were to play it by the letter then the owners manual actually says that ONLY Pirelli tyres should ever be fitted... which to be honest is bloody stupid! (Sounds like Alfa and Pirelli have got themselves a nice little earner there). If ever there was accident was caused 100% PURELY down to someone having anything other than 235/40/ZR19 96Y Pirelli Nero tyres fitted, then the insurance company would have to prove that a 245/255 was unsafe and as such was the SOLE cause and reason of the accident.
In reality, it would never happen. If it was so important to keep the size of OEM fitted tyres then every single car from a Kia to a Koenigsegg would be under this rule, and it would be the first thing any insurance company would check come claim time...(the ultimate get out clause) Its Alfa being cheeky as usual, thats why even official used Alfas from Main Dealers dont come fitted with these Pirelli's.
Anyway, back on topic... Has anyone tried 255 on the front?
The problem is if you do not inform your insurance company that you have modified your car then they are quite within their rights to withdraw you from cover. Insurance is a contract of utmost good faith - that means they take it that your car is standard unless you tell them otherwise. What you really must do is make the phone call to discuss it with them. If they are ok with it fine, they might be ok and charge you more, or they may decline your insurance. If you do intend to change the tyre size though, check out the load index too and talk to your insurers.
146 1.6TS, 156 2.0TS, 156 1.8TS, 147 1.6TS, 147 2.0TS, 159 1.9JTS, 147 1.6TS, 159 1.9JTDm, Mito 1.4, GT, Giulietta 2.0JTDm, Giulietta 1.4tb, Giulietta 1.6JTDm........