Anyone running 295 rear for +45 offset on 20's with 10.5" wheel?

Most people including myself are running 285/30/20 (or 275/30/20) on the rear. Reason why I am asking because I just stopped by Discount tires to get some air on my tires and they said my tires are bad (crack on the side walls) bc I am running tires too small for that type of wheel. They told me I should be running 305 on that kind of wheel diameter. What do you guy think?

Tire brand currently on: Nitto NT555 Extreme

 

first of all Discount tire is smoking crack , the max is 285 on that car or else u will have rubbing issue, and 10.5 is the max also. what wheels r u running on it .dont even put 295 , u will be having problems, and the cracking is not from that,u tires might be old thats y, there is a date code on it, from there u can figure out if they sold u old tires.

 

I have custom forged wheels, I took the tires off my old wheels that was on Vossen cv3 belonging to the previous owner. I was just curious if any else has that issue with their tires. I have about another 10k miles left on those tires. I will keep my eyes on them and go from there. Thanks for your input. That's why I like club Lexus!

 

285 is the nominal tire width for a 10" wide wheel. I've been thinking about going with at least a 295 on a 10.5" wheel as well, but holding off until someone releases a camber kit and I can take some accurate measurements for custom offsets.

I have a +48 offset on my 10" wide wheel right now, but I think there is still more room on the inside.

 

the inside yes Terrycs , but the outside is the problem and if its lowered also forget it, that's guaranteed rub.