I just got slp 17X8 with bfgoodrich and the don't seem as wide sas my old nitto 500 does any one know is the bfg not as wide as the nitto 555 and haw they handel the size is 245/45zr17

 

you need to look it up on a site that tells you size, sidewall to sidewall and then tread width.
since you only gave us one size 245/45 17 - i will give you the data for that tire only.
the height of that tire - on the rim and properly inflated is 25.68 inches. stock height for a 3rd gen is 26 inches.
so bridgestone is 9.6 section width and 9.1 tread width.
unfortunately the chart i am using does not show goodrich or the nitto 555.
and the nitto site does not give tread width, but section width is 9.61 or 1/100 of an inch wider.
goodyear is 9.4 with 8.1 tread
but the goodyear eagel is 9.6 with 9.2 tread.
the goodyear eagle nct5 is only 9.6 with 8.1 tread.
are you begining to see the difference in tread width vs section width?
you will have to look them up - google is your friend.