Winter Tires
#2
Lexus Champion
Since our cars were designed to run staggered wheels & tires, I'm not sure if this will work. However, I've seen others who have purchased snow tires & wheels sets that aren't staggered (225/40-18 all around). I would definitely check with a tire expert (Tire Rack or a reputable tire shop) and ask for their advice.
#3
The staggered setup on your vehicle is a 225/40R18F and 255/35R18R. On average, those tires are 25.1" and 25.0" in overall diameter. Those two sizes are so close that the rotational speed is nearly identical. The traction control, ABS, etc. are all directed by the wheel speed sensors, which measure how quickly your tires are rotating. With such a small difference in OD, the stock staggered setup is rotating at the same speed as if you had a square setup. Running a square setup for winter use will not cause any problems. I actually recommend it because you'll have better grip on the rear end of the vehicle if the rear tires are following in the path cut by the front tires instead of trying to plow their own.
#4
The staggered setup on your vehicle is a 225/40R18F and 255/35R18R. On average, those tires are 25.1" and 25.0" in overall diameter. Those two sizes are so close that the rotational speed is nearly identical. The traction control, ABS, etc. are all directed by the wheel speed sensors, which measure how quickly your tires are rotating. With such a small difference in OD, the stock staggered setup is rotating at the same speed as if you had a square setup. Running a square setup for winter use will not cause any problems. I actually recommend it because you'll have better grip on the rear end of the vehicle if the rear tires are following in the path cut by the front tires instead of trying to plow their own.
if i run 18x8 45et all around, wouldn't i also need a 5mm spacer for the rear wheels to account for the 45et vs 50et difference?
#5
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I'm running the same all around 225/40/18. You don't need spacers because 5mm difference is there only because the rims are wider, this way the larger tires can go further toward the shock, so the load is still centered on the hub.
I hope this makes sense. Bottom line, 8" +45 is ok in rear and your wheel will be in the same position with respect to your fender. You can also save money and do 225/45/17 no problem. Putting 8x8.5" +50 in the front is definitely a NO though
I've scuffed my 18s in winter quite a bit and wish I went smaller.
I hope this makes sense. Bottom line, 8" +45 is ok in rear and your wheel will be in the same position with respect to your fender. You can also save money and do 225/45/17 no problem. Putting 8x8.5" +50 in the front is definitely a NO though
I've scuffed my 18s in winter quite a bit and wish I went smaller.
Last edited by Hite10; 03-22-15 at 04:46 PM.
#7
As many others have said, 225/40R18 will be fine for a square setup. My dealer threw in snow tires for free when I purchased the IS and used the same configuration. I had the same concern with going square when the manufacturer's setup was staggered, but after some checks, the rolling diameters are so similar that it makes very little difference. The difference is well within the +/- 2% rule of thumb.
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#8
Lexus Test Driver
As many others have said, 225/40R18 will be fine for a square setup. My dealer threw in snow tires for free when I purchased the IS and used the same configuration. I had the same concern with going square when the manufacturer's setup was staggered, but after some checks, the rolling diameters are so similar that it makes very little difference. The difference is well within the +/- 2% rule of thumb.
Last edited by AndyL; 03-23-15 at 10:18 AM.
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