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Wow, so that is how you would build an rx f sport.>>>I DK 'bout a rx "F sport'' LOL......This is my wife's car & I've taken it over since I sold my superbee, back in '20.........Two of her g/f's have rx's & I looked around & researched mid/size suv's, beside's a SRT GC, a rx would do for her. Different then I'm use too thou. But it does the job. It doesn't like to be hustled in corners, but the 2gr does pull the 4200lbbs pretty good. My brother & I found it does stop that good thou, hence needing brake upgrades.
But I do have the 3rd gen rx bkk on my cart in rockauto. I have not pulled the tigger yet. I'd add at least new rubber brake hoses or better SS hoses. Flush the old brake fluid w/ new dot 3 fluid. btw there are two different front calipers of which either works.
But my tires are due, hence this thread.
If your sticking to the oem 18'' wheels, I'd stick w/ the 235/55's for the best performance vs any tall 60 series tires.
Hello!
My 2009 Rx is due for a tire change.
I personally want to put on bigger tires. Plus! My speedometer is fast. When it shows 63mph, my GPS says its 60mph.
Im thinking the quickest way to remedy this is bigger tires.
Im thinking 236/65r18. On stock wheels.
I read it might not fit due to the perch on the rear shocks but I already changed mine to highlander shocks so the perches are higher.
What are your thoughts on this? Is there anything else I need to consider?
Thank you for sharing your thoughts!!
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Hello from Canada! Your original size is 255/55R18, and you are proposing 235/65R18; I considered doing this myself. Please refer to https://tiresize.com/comparison/ for an EXCELLENT comparison of the differences. Summary: this site shows that your actual speed will in fact increase by 2.1 mph when doing 60 mph, so that'll fix most of the inaccuracy that you (and I too) find in our speedometers! LOL! Tires of this size are also much less expensive! Bonus! You should get slightly better traction in wet weather, and slightly softer ride too. But... Costco and other tire shops will outright REFUSE to install these for you, as they are afraid of any liability. I tried to find a shop to install these and failed; even Midas refused to do so. SOLUTION: So I ended up just getting my tires from Costco, and I stuck to the recommended size (255/55R18), and got the new all-weather Michelin CrossClimate, which I've been particularly happy with (in Toronto area), as they have EXCELLENT traction in both wet/heavy rain and snow, a very smooth and quiet ride, and get about 8% better fuel economy as compared to my Yokohama Geolandar's that I had before. My speedometer is still off... same as yours! LOL. You'll just have to live with it.
235/55x18 is the standard up size w/ a, 28.1'' diameter......225/65-17 is the base size= 28.5'' diameter....255/55x18= 29.1'' diameter 29.1'' will work, best to be on a 8.5'' width wheel vs a 7'' wheel.
What are the benefits of switching - using Highlander rear struts, is it height or ride quality, also what years direct bolt on to ‘05 Rx330 and ‘06 Rx400h. I love specs, metrics and CrossFit data. My appreciation in advance for any information.
What are the benefits of switching - using Highlander rear struts, is it height or ride quality, also what years direct bolt on to ‘05 Rx330 and ‘06 Rx400h. I love specs, metrics and CrossFit data. My appreciation in advance for any information.
I believe its the height of the spring perch, thats the least of the issue.>>> Main issue is using the oem postive (7'') wheels w/ taller tires which'll have a ballooning effect, which'll have less strut to tire sidewall clearance. One look at the tire sidewall to strut clearence will show you. Piece of cardboard/mat behind the left rear tire & get down & look up at the strut to tire sidewall clearence. Use a 8.5'' width wheel, w/ 235/55-255/55 tire w/ a 10mm to zero offset. Using a 235/55 squares up the sidewall for better corning. Next step would be a set of 9.5''-10'' wheels w/ a zero offset w/ 295/45-18's, same od (28.5'')as the basic 225/60/17. btw no issues w/ the front end, steering, bumps, rubbing,ect. Plenty of room. Plenty of wheels choices, look for a 4.5/114.3mm by 5 w/ a zero offset in a 8.5''-10''. Don't add your vehicle in the boxes.
Just sharing to finish off this thread. I finally pulled the trigger on bigger tires!
This is me jumping in the Badlands, Wilderness, Trailsport, Trailhawk trend.
I got 245/60 r18 Bridgestone Dueler A/T Ascent and it looks great!
On stock wheels, no spacers in front. I needed spacers at the back, I had 20mm because the tire shop insisted but I believe you can do with less spacer. Its the design on the tires sidewall that is causing the issue.
I also did the recommended BKK and SS lines. Oh boy I had to argue with the mechanics and show them the brakes fit! Anyway, its all finished now.
Looks great, ''Manong sauce''.......If your wanting to do a rear BBK, you'll want to go w/ the 2nd gen Highlander setup, '08-'13. You'll find the 3rd gen rx calipers bolt but will be offset to the disc & the parking brake hat is a bigger diameter, meaning a complete 3rd gen backing plate, parking shoes, ect, wheres the 2nd gen Highlander uses the smaller parking brake hat & has the bigger disc diameter as the 3rd gen rx. End result= Go w/ the complete 2nd gen Highlander brakes= rotors/pads & a pr of reman calipers.......Not quite as noticable as the front brake upgrade, but you''ll find the rotor diameter is bigger & the brake pads are about 1/3rd longer. So if your needing rear brakes, you'll be out a pr of reman calipers. Flush the old fluid out w/ nnew dot 3 & great time to replace the brake hoses w/ new rubber ones, if not SS hoses.........
