18" Limited wheels on a 07' Sport

[Calif-4runner]

Question. I'm thinking of swapping my stock 17" Sport Wheels for 18" Limited wheels. I like the gunmetal finish and the stock look should go well with the Galactic Grey.

Two questions:
1. If I get 5 rims and mount 265\65-18 BFG AT will the spare still fit under the rear?
2. Is there a way to have the dealer install or re-program the speedo to be right?

Any info would be helpful as I'm a newbie to 4unners.

Thanks in advance . . .

 

[Uneek]

1. Yes, your 265/65R18 will be the same as a 265/70R17 and it'll fit underneath.
2. I don't think so. I believe you'll show 59 or 60mph on the speedo when you're actually doing 62mph.