Welcome to the site Fred! I am going to move your post to the Avalon area to get better views on it for you. I would ask a tire place, like Discount Tire, as they can tell you what will and won't fit.

 

I have not tried them personally, but a previous thread (post #21 & #22) stated that they fit. I think I also read that It's more a matter of fitment on the rears, believe-it-or-not. I wouldn't expect too drastic of an improvement, though. The 2016 revised the spring and shock rates (I think they used a different stabilizer bar too) to make it a softer ride. I'm sure there will be a little difference with the change you're thinking about, just not a huge difference. Note that your actual speed will be ~6.5% higher at the same speedometer reading due to the greater circumference of the wheel/tire combo.

Something else to consider, think about going to a "S" or "T" instead of a "H" or "V" speed rating on the tire. The lower speed rating typically uses a softer sidewall and therefore is slightly more compliant in ride quality. Don't do this if you're a 79 year old "Speed Racer" though.

B.T.W., welcome to the Avalon forum... enjoy your car.

Edited:
Due to lack of "S" or "T" choices, I need to revise my earlier recommendation and instead recommend "H" over "V" (or higher) speed rating. For the sizes we're looking at, "S" and "T" rated tires are overwhelmingly winter tires. They would in general be noisy due to their aggressive tread and wear too quickly for all-season use due to their softer compound.
There are a few S/T choices in the 50 size... you may want to take a look at them.

 

I seen a post from a member of the Facebook Avalon group that installed 225/55/18 on his so it can be done, i personally had 225/50/18 on mine recently and like it much better.

Hopefully that helps out however it might not be enough to get as nice of a ride as your wife’s vehicle being that you mentioned her’s is a 2016 and they did a revision that year with different spring and shocks, some people with the 2013-15 Avalon’s have upgraded to the 2016-18 suspension

 

B4 you spend a lot of money on different size tires! What brand and model tires does the 2014 have now? And what tire pressure are you running with them?

 

Hi Shortstop.....I have 225/45/18 Iron man...believe Chinese and holding 33 psi.
Thank you for your advise...waiting to hear your reply....

 

Was hoping you were going to say more like 40 psi. You could lower them a little more but it`s not going to help enough.
Not sure how you feel about spending a lot of money on new tires? Here are some options.
1 If bought from a dealer maybe they will swap another Avalon with 17 inch wheels and tires for you. Or search your local auto recycle place, for the Avalon type 17 inch wheels and tires for a swap.
2 Or Swap your wheels and tires from the 2016 to the 2014. The 2016 suspension maybe able to handle the 18`s better than the 2014 can, and try it for a few days, if you like the results have the sensors re programmed for the TPMS to work right on both cars. 3. Easiest fix, would be to Go with the 225 55 18 in a H or T speed rating an hope for the better ride on the 2014 Avalon.
My 2014 came with the 18`s also but I switched over to 17 inch wheels with 215 55 17 V Michelin Primacy tires The ride was a little better, and no more constant watch out for potholes at 60 plus. The high speed handling a little less with the 55 profiles, and cost a lot of money. Maybe I should have upgraded to the newer suspension for better results? The 2014 does ride a bit too firm for me over poor roadways, even with 215 55 17 V

 

Was hoping you were going to say more like 40 psi. You could lower them a little more but it`s not going to help enough.
Not sure how you feel about spending a lot of money on new tires? Here are some options.
1 If bought from a dealer maybe they will swap another Avalon with 17 inch wheels and tires for you. Or search your local auto recycle place, for the Avalon type 17 inch wheels and tires for a swap.
2 Or Swap your wheels and tires from the 2016 to the 2014. The 2016 suspension maybe able to handle the 18`s better than the 2014 can, and try it for a few days, if you like the results have the sensors re programmed for the TPMS to work right on both cars. 3. Easiest fix, would be to Go with the 225 55 18 in a H or T speed rating an hope for the better ride on the 2014 Avalon.
My 2014 came with the 18`s also but I switched over to 17 inch wheels with 215 55 17 V Michelin Primacy tires The ride was a little better, and no more constant watch out for potholes at 60 plus. The high speed handling a little less with the 55 profiles, and cost a lot of money. Maybe I should have upgraded to the newer suspension for better results? The 2014 does ride a bit too firm for me over poor roadways, even with 215 55 17 V

Morning Shortstop,
Thanks for all the advise a bit complicated and lots of work to do. Well when it all boils down looks like going to keep my tires till they wear out and will go with the 50 or 55. I bought the car from Carvanna. Happy with the transaction. However next time on purchasing an auto will definitely pay greater attention to the tires and suspension.....
Have a good day!
PS- my blind spot mirrors alert system is out. Any ideas besides bringing it in.....?

 

I don`t think a 225 50 18 will be enough of a difference for your Driving in Brooklyn. The 225 55 18 T or H will ride a bit better. than a V rated speed tire. For the blind spot monitor the switch on the dash should light up first, if both mirrors don`t work it might be a bad fuse under the dash. (left side) no easy task if your not limber and have bad eye sight for me.

 

Thank you Shortstop on the tires and the BSM. Had given up on the BSM as I know big money if I take in. So I will look under the dash to see about the fuse. What I get now is a yellow triangle on my dash if I switch on the BSM.

 

I would be on the phone with Carvana The car should have a 100 day warranty. And a 7 day buy back if not expired ! The 2015 and 2016 have some problems with the sensors and or a short to ground in the mirror housings from what I read.

 

Thanks Shortshop...I have the car for over a hundred days....my fault. Will look for the fuse...if not it will do without be too expensive to take in.....

 

I have a 2014 Avalon Hybrid XLE Touring. It has 17 inch wheels. It has 215/55R17 Michelin tires on it. It takes a bump real hard. Toyota firmed up the suspension too much starting with the redesigned 2013 model. I am afraid that we are just stuck with a pickup truck like ride.

 

You are not stuck. There are posts in this forum that lists the part numbers that can be ordered to install the softer suspension that Toyota specified for the 2016 and newer Avalons. It’s a relatively inexpensive fix and probably worth it if you intend to keep your vehicle for a longer period of time. My 2018 glides along beautifully on 17” Michelin’s.