TIRE SIZE Q, Too BIG?

quick question, I recently did my suspension and I removed the quad shocks and want to run bigger tires. I own an 89 LX. I'm currenty running 255x45x17 in the rears and 245x45x17 up front. My question is that I want to go to 275's or maybe bigger in the rears on a 17x9 rim, would I come across any problems?
 
woah SEVAN's ? messed everyone up... SEVAN those 275s should fit fine... especially since your quads have been removed... and hopefully your 17in rims have the right amount of backspacing...

and 89GX was refering to K12's tire pick saying they are not gonna be the same height as stock... so your speedo will read slower... the 50series would be same as stock as the plus 1 system goes... and make your speedo read correctly... but you already ordered the tires...