It will have around a 11mm larger radius too. The "55" is a %age of the width (235 or 255)

 

Speedometer and odometer will be slightly (about 2%) off.

Tire Size Comparison

 

He can always take to the dealership who can recalibrate the speedometer and odometer.

 

Some tire stores like Costco who sell the Mich CC2s will only put on what was the original size tire, and they will look it up to check. But probably independents will sell you anything.
Be sure the new tire's load index is at least what was original.
Tirerack says the diameter of the larger CC2 tire is 31" but my original Alenza is 29.3", so a big difference - the spare should not be used for a long time.

 

Never thought about the spare tire being a potential issue. Probably best to stick with the OEM tire size. Thanks folks,

 

Installed larger 255/55R-20 tires on my XSE

Pirelli Scorpion Verde Plus II, traded in the OEM Goodyears at Discount Tire. Happy with the softer ride quality and beefier looks.

www.toyotanation.com

 

Installed larger 255/55R-20 tires on my XSE

Pirelli Scorpion Verde Plus II, traded in the OEM Goodyears at Discount Tire. Happy with the softer ride quality and beefier looks.

www.toyotanation.com

Softer and quiet is what I'm looking for either in the OEM 235 or in the 255 size range.

 

These Pirellis sure got noisy after 20k miles. Since I don’t need all seasons in south Florida I’m going to opt for Michelin Pilot Sport summer tires next. Hopefully they won’t get so noisy.

 

I have a 2020 Limited AWD with the same size stock tires. I replaced them at 49k miles with with Goodyear Assurance ComfortDrive 255/50/20 about 4 months ago so pretty close to your size.
1. I've had no issues with rubbing.
2. The ride is smoother and there is tons of grip but no real change in soft or firm.
3. Actually less noise on the highway and no real difference in my daily stop-and-go.
4. You didn't ask, but I lost about 1 mpg from the increase contact friction....also I tend to have more fun in turns with all the extra grip so that may contribute as well.

The 255/50/20 size was ideal for me as it is still roughly the same diameter as stock which means the spare will not be an issue nor speedometer error. The HL looks mean with such wide tires!

 

Beaker556, good info. Still undecided on which way to go. I want the extra grip in the turns and the feel of more contact surface. Plus I do like the looks! Appreciate your input.