Will this fit?

21 Tundra SR5 Crewmax with stock, base aluminum wheels, no mods.

I'm looking for decent Black wheels that will fit the tires on it which are 255/70/R18

Costco has a side company or partnership with Veloxwheels and I really like the Pyro SF
which has specs of:
18x8.5-150
offset: 18
PCD 5-150
Hub Bore 110.1
Costco Velox Wheels | Select wheels for 2021 TOYOTA TUNDRA (18 inch))

I've tried to educate myself on all of the specs and how they affect things, but I think I'd have to work in a tire shop for a while to really grasp it.

Will these wheels fit my Tundra with no additional mods?

 

Is anyone even seeing this post?

 

Yes, easily. You could put a larger tire on if you wanted.

 

Those are sexy!! I went with a 275/65/18 to fill the wells a little better, they still look small.