You wouldn't have any problems clearance wise. In fact, the wheels would still look tucked into the wheel wells, so you might even need spacers to bring out the wheels a bit. These wouldn't do much for the gap either, depending on the tire diameter you go with, so you'd still need a drop to get rid of the gap in the fender well if that's what you're going for. So springs + spacers is a must if you want a flush look with these wheels.

TRD USA Wheels
 

No you won't need spacers or anything. These are TRD wheels and are designed for the car. These tires have a +35 mm offset which is much more aggressive than the stock tires +48 mm offset which means the tires will be pushed out 13 mm making then much less tucked

Despite being a TRD Part, wouldn't the speedometer be slower because it's 18 inches?

Technically yes, however it's insignificant, but it solely depends on what tires you're running

http://www.rimsntires.com/specspro.jsp

I like them, too bad there aren't other color options. I don't know gunmetal or something... wonder if those center caps will fit on stock rims lol

oh sorry, i dont have an extra $10k laying around for those wheels...

What tire size should I be getting to keep it from messing with my speedometer?

TRD USA Wheels
 

Stick with 225/40R18 it's what they recommend for the rear. I would get that size all around, your speedo will be off by about 1 mph on the high side.

Where are you seeing $10k at?

They're $1036 for a set

oh i just assumed since they were TRD they were gonna be priced like the JDM TRD set...

This TRD is NOT Japan TRD.

Japan TRD is a part of Toyota Motor Company. This TRD is a part of Toyota Motor Sales. Most of the parts are sourced through local suppliers you guys would buy from anyways (Enkei, Eibach, etc.). Even the forged Tundra wheel is not a couple thousand dollars a set, so I would guess this will be at or around $1000 for the 4.

That still doesn't answer my question.

It's called google ==> http://www.toyotaracing.com/trd/part...categories=all

259 x 4 = 1036

If you argue with math you will lose