cutting bed for bags

does anybody no exactly how much u have to cut your bed on a 99 sierra to clear c -notch and 275 45 20 inch tires, dont want to cut something that does not need to.

u might wanna step down to a 255/35, those tires u have are huge

yeah, those tires are huge

The 45 series tire is like a 35 series 22 I believe. You could go to a 35 series 20 but they look a little small and doesnt look right in my opinion. I would and did go with a 40 series. But if you plan on going with 22s later you could stay with what you have and all the hard work is done.

As for your question. Just take measurements, everyone does there setups different so giving exact directions is almost immpossible.