Gamalot

Excellent PB! Thank you very kindly.

My question was more about the computer technology. Bolt patterns are the same and the wheels will fit fine so no issue there. Since the standard grade RX350 does come with 18 inch wheels but the fancier grades step up to 20 inch I wondered if they have to make some internal computer settings changes to accommodate the bigger wheels on the upgraded models. I suspect if there are settings that need to be changed those would be done at the dealer through the ECU connection.

The RX350 is my wife's car and now that she is retired I plan to keep it parked in the garage all winter except on the nicest of days. She will be Grounded when the roads are crappy or she can drive my 4Runner. The Lexus has to last us lots of years. I will probably sell the wheels and tires when winter gets a bit closer here.

Thanks Dave for all your research. My 18" wheels have very nice Blizzak tires but the size is 235/60/18, 29.10.

I am not sure I did this correctly or what these numbers actually mean. The best I have found is Yes, my 2015 18" wheels will fit on the 2021 RX. 3 different size tires are listed. 235/60R/18 =29.10 235/65R/18 =30.03 235/55R/20 =30.18 I suspect with nearly an inch of difference it could throw my speedometer off a little but when I do swap I should be able to match what the speedo says against what the GPS is reading and adjust my driving speed accordingly. Whether or not this might mess with any of the onboard computer systems is another unknown. On our 600 mile trip we averaged 25 miles per gallon and I used the Radar Controlled Cruise most of the trip. At first I did not like it much but once I fully understood how it functions it was helpful to a degree. It just felt weird at first when I had the cruise set at 70 MPH but if there was a car in front of us going a little slower it kept us back a safe distance and adjusted our speed until I would pull out to pass.

Thanks Les, think you have missed my question specs. My older 2015 RX wheels are an original stock 18" set with just winter Blizzak tires. I think but can't be sure some lesser models of the 2021 RX350s come with 18" wheels but the upgrades are either 19 or 20". Our 2021 came with the upgraded Michelin LTX 235/55R20 wheels and tires you have. If the 18 inch wheels will fit, which is my question, the only other parameter will be if my 18" tires are the same height as the 20" tires we both have. I am not sure but I think the size 235 is the sidewall height and the 55R is the width of the tire. 235 in an 20" wheel and tire could be about the same height and circumference as 265 in an 18".

I thought the same with my 2016 4Runner when I swapped to 17 inch wheels and tires for winter from the original 20 inch wheels and tires. It turned out to be fine since the 17 inch tires were the same height and circumference as the stock 20 inch ones so it made no difference. I am not yet ready to swap to winter treads on the new RX but when the time comes I will have to make 2 important inspections. Will the smaller wheels clear the brake calipers and is there a big difference in the actual height/circumference of the tires that could throw off my speedometer calibration. All these wheels have the correct TPMS sensors installed so no issue there.

My 2015 RX350 had 18 inch wheels and I bought a second set of the original OEM wheels with TPMS sensors and used them with Blizzak winter tires. I traded the 2015 for a new 2021 RX350 that has 20 inch wheels but I still have the 18 inch winter set with lots of tread left. Will the 2015 18 inch wheels fit the 2021? I suspect the bolt pattern remains the same but my concern is have they increased the caliper size for 2021 that would cause a clearance issue?

Some have mentioned there could be a gel filled pad in the seat cushion but I can't confirm this. If there is in fact a gel pad then it is very possible the shape of your rear is what is causing this uncomfortable egg you feel. I once bought a seat pad from Temperpedic for my office chair. It felt great when I sat on it but after just a few minutes the foam would press down and redistribute into the middle between both of my cheek bones and cause a lump in between. When I got up I could see a well defined lump in the middle, causing what I call a "Wedgie" and 2 indents where my rear end bones pressed the foam flat pushing it toward the middle. I absolutely hated that cushion and gave it away. We are now close to 2,000 miles on our RX350 and have not noticed any such problem as you describe so far but only my wife has taken a long 400 mile drive to visit family with no comfort complaints. Toward the end of this month I will be driving 10 hours straight and will have a better assessment when I get home.

IMO Toyota Navigation systems are useless. The system in my 2016 4Runner Limited wants to send me around the block to get across the street. I instead use a Garmin Nuvi with lifetime map updates. We have not yet tried using the nav in our new RX350 but I will say the larger display screen is great. One would think that with our smartphones having up to the minute updates and our stand alone GPS gadgets all having free updating the auto manufacturers would make the map updates cheap and easy. Something as simple as an inexpensive USB jump stick with the updates simple to upload. When searching for the new RX one option that was not on our Must Have list was navigation. The RX we settled on did have it so it is there but still the Garmin is easier to use and has never taken us off the beaten trail.

My wife drives the Lex RX350 and I drive a 2016 4Runner Limited that I do love but I will always wished I bought the Tundra instead, just love a nice pickup for the play stuff I do. Love my Dual Sport motorcycles too but getting too old now to even enjoy them. Custom built Suzuki DR 350 made into a Big Wheel so it would be street legal.

I live on 120 acres and am the property manager overseeing 5 homes and the woods for a fellow who lives out in California. He is as green minded as they come and I am happy he does his voting on the left coast. I have to do some reading on the difference between Hybrid and other electric battery powered vehicles before I can accurately assess the values they might have here. I am in the NY Catskills mountain area and more like the frozen NE. Most of my driving is on secondary country roads with relatively short hops to and from town as I am retired and don't actually need to go anywhere but for groceries and supplies. I fish and hunt and for the last 15 years I might only put 8K miles on either of my vehicles.

That's probably not necessary Lex. Our 2021 came standard with 18" wheels and tires but with the fancy upgrades we ended up buying it has the 20" fancier wheels. My 4Runner Limited also came with 20" wheels but the winter set I bought are 17" and I just had to make sure the smaller wheels cleared the brakes. If I stand the 17s along side of the 20s they are the same height and circumference which I think is all in the tire sidewalls. My question goes more to if they changed anything like bolt patterns or larger disc brakes from 2015 to 2021 models.

We traded in our 2015 RX350 for a new 2021 RX350. The 2015 had 18" wheels and tires and the 2021 has 20". I have a winter set of OEM Lexus 18" wheels with almost new winter tires and the TPMS sensors that are the exact same wheels as my Lexus came with in 2015. Will these fit the new 2021? I prefer to keep the nice wheels nice and always have a winter set with snow tires in this rust belt sand, salt and crappy roads.

We traded in our 2015 RX350 for a new 2021 RX350. The 2015 had 18" wheels and tires and the 2021 has 20". I have a winter set of OEM Lexus 18" wheels with almost new winter tires and the TPMS sensors that are the exact same wheels as my Lexus came with in 2015. Will these fit the new 2021? I prefer to keep the nice wheels nice and always have a winter set with snow tires in this rust belt sand, salt and crappy roads.