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OEM 235/55R20 on 20X8 36mm offset wheel (F-sport wheel) vs 265/50R-20 on 20X9 35mm offset wheel
Suspension clearance: 14 mm (0.6'') closer to suspension/brakes components than OEM.
Fenders clearance: will stick out 16 mm (0.6'') farther than OEM.
Tire diameter: 235/55R20 - 766 mm (30.2''), 265/50R20 - 774 mm (30.5'')
Sidewall: 235/55R20 - 129 mm (5.1''), 265/50R20 - 133 mm (5.2'')
Can you safely run 255mm width tires on the OEM 20x8 wheel? I want wider tires wheni it's time to replace the stock tires but I would want to keep using the stock 20x8 Fsport wheels.
Can you safely run 255mm width tires on the OEM 20x8 wheel? I want wider tires wheni it's time to replace the stock tires but I would want to keep using the stock 20x8 Fsport wheels.
I found 3 tire upsize options for my 4RX with the 18" rims with this very helpful site. Follow the setup procedure for your 4RX, then click "alternate sizes" and it will show you several upsize alternatives that stay within total diameter limits. Hope this helps. https://tiresize.com/tires/Lexus/RX/2016/350-AWD/
For example, on mine I can go to a wider 255-60-18 from the original 235-65-18 and still stay within the 30" diameter.
I found 3 tire upsize options for my 4RX with the 18" rims with this very helpful site. Follow the setup procedure for your 4RX, then click "alternate sizes" and it will show you several upsize alternatives that stay within total diameter limits. Hope this helps. https://tiresize.com/tires/Lexus/RX/2016/350-AWD/
For example, on mine I can go to a wider 255-60-18 from the original 235-65-18 and still stay within the 30" diameter.
Thanks for the response. I am very familiar with that site. My question is about tire width with respect to wheel width. A previous poster on this thread mentioned that you can run 265 mm wide tires on the OEM 20x8 wheel but every reference I see on the web (see below) says that the max recommended tire width for an 8 inch wide wheel is only 245 mm. I plan on getting 255/50/20 tires when it's time to replace the stock tires. Is there anyone here who has used 255 or greater width tires on the stock 20x8 wheel?
Thanks for the response. I am very familiar with that site. My question is about tire width with respect to wheel width. A previous poster on this thread mentioned that you can run 265 mm wide tires on the OEM 20x8 wheel but every reference I see on the web (see below) says that the max recommended tire width for an 8 inch wide wheel is only 245 mm. I plan on getting 255/50/20 tires when it's time to replace the stock tires. Is there anyone here who has used 255 or greater width tires on the stock 20x8 wheel?
The tire manufacturers specify the minimum room width for their tires online.
Going wider than recommended might cause the tire to come off the rim during hard cornering our any other high side load of the tires.
I would check with your insurance company what their thoughts are on this. They could deny any claim if they deem you have modified your vehicle outside of manufactures recommendation. Many of those computer gizmos work based on a set of variables, traction control, anti-lock, etc. Changing one of them could affect the safety and performance of the vehicle.
I was denied warranty work on a jeep for bigger tires. Funny thing they came with the Jeep. It was a special off-road option that the dealer had never seen. I had to supply the original bill of sale before they would repair the front end.
I agree the vehicle would look better with a size or two bigger
The 20s look better and the newer cars are more designed for them in terms of looks. The suspension may not necessarily be designed to work as smoothly as with tires with larger sidewalls. Generally the ride quality is much more bone jarring the larger the rims are.If you want comfort and live and drive in an area with poor roads, you'll want the 18s over the 20s. Another consideration is tire life expectancy which is much less with 20s vs 18s. Yes, you'll be spending more on tires over the life of the vehicle. Also you'll be more prone to rim damage if you err too close to curbs on occasion.
I just bought a set of factory 5 spoke wheels with Michelin premier LTX tires on Ebay for $2K (takeoff's from a new 450) for my 16' base RX.They do not come with TPMS. I don't know if I should keep the 18" wheels as a winter wheel set (and save tread and damage from my new wheels). I found some aftermarket TPMS units for $36 each. The other option is take the TPMS's out of the 18's, and sell the old wheels on craigslist.
For me, it's all about the gap in the wheel wells. This is a peeve of mine with Lexus and Toyota vehicles. Compared to their competitors, it seems that Lexus/Toyota tends to leave an unnecessary amount of gap in the wheel wells of many models. A perfect example is the new 2016 RX. The amount of wheel gap with the 18" wheels & tires vs the 20" ones is noticeable to me. I was going to get the RX with the 20" wheel only. I didn't even consider otherwise because of the gap. Luckily I found a base model with the 20" option. They had only one in the lot and I snagged it up.
The 18" and the 20" tires have the same outside diameter, hence the gap is the same. It's only illusion of less gap due to larger rim.
I think the larger wheel with less tire is more prone to pothole caused wheel & tire sidewall damage.
With my wife's volvo with larger wheel size,in one year I had to buy a new wheel & three new tires from pothole damage.Seeing that big bubble get larger & larger on relatively new tires is very frustrating.
So, I have a question for anyone in the Chicago area who drives on Route 88 (The Reagan) or anyone who regularly drives on transverse grooved concrete highways.
I have a 2018 RX450h w/the 20' tires. The ride on these types of highways is horrible in my RX - lots of tramlining and excessive vibration through the floor into the seats of the car. It's very uncomfortable. Alignment, tire pressure, balance - all OK.
Has anyone else had (or have) a similar experience?
05-27-16, 01:53 PM
