For winter, do I need new tires?
10-10-12, 09:21 PM
#31
Yes, correct for AWD you can since the car was designed to run all around the same.
The RWD, not quite. Youc can technically put 225's in the back to make them all around but then the odo would not be quite accurate the revolutions is off.. Unfortunately the spedometer cannot be reprogrammed to take in account the different tire; if it could I would probably would consider going all around.
The RWD, not quite. Youc can technically put 225's in the back to make them all around but then the odo would not be quite accurate the revolutions is off.. Unfortunately the spedometer cannot be reprogrammed to take in account the different tire; if it could I would probably would consider going all around.
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
255/40-18 4.0in 13.0in 26.0in 81.8in 775 0.0%
225/45-18 4.0in 13.0in 26.0in 81.6in 777 -0.2%
225/40-18 3.5in 12.5in 25.1in 78.8in 804 -3.6%
10-10-12, 09:45 PM
#32
I agree I would not run 225/40/18 on the rears because it is more than a 3% difference in tire diameter and thus odo reading. However, if you ran 225/45/18 in the rear its only 0.2% difference, which is means the odo will only be off by 120 miles for every 60,000 miles driven on winters. An acceptable difference for the better winter traction IMHO.
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
255/40-18 4.0in 13.0in 26.0in 81.8in 775 0.0%
225/45-18 4.0in 13.0in 26.0in 81.6in 777 -0.2%
225/40-18 3.5in 12.5in 25.1in 78.8in 804 -3.6%
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
255/40-18 4.0in 13.0in 26.0in 81.8in 775 0.0%
225/45-18 4.0in 13.0in 26.0in 81.6in 777 -0.2%
225/40-18 3.5in 12.5in 25.1in 78.8in 804 -3.6%
10-11-12, 05:28 AM
#33
I also have a set of Dunlop Sport Maxx tires on my RWD IS350 and I assume I need to get a set of winter tires, but I don't want to get another set of rims. Is there any downside to mounting and dismounting tires on rims other than the cost of mount and balance? Is that going to affect life of rims or tires?
"Understand that mounting tires on any wheel is very stressful on the bead and sidewall. The process of mounting and un-mounting creates the risk of tearing the bead and possible sidewall distortion. I wanted to keep this to a minimum so the only answer was to mount them once."
10-11-12, 06:11 AM
#34
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Do you think this setup with DWS's (year-round) would create a noticeable drop in handling?
10-11-12, 07:34 AM
#35
Lexus Test Driver
The idea is to keep the same tire size all around, if you are going to go stagger anyway, then just go with OEM size. Based on the above, for 18" wheels, 225/45 would be the way to go all around then, as it would keep the rear size close to the OEM circumference, while keeping the front and rear width identical.
10-11-12, 07:46 AM
#36
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The idea is to keep the same tire size all around, if you are going to go stagger anyway, then just go with OEM size. Based on the above, for 18" wheels, 225/45 would be the way to go all around then, as it would keep the rear size close to the OEM circumference, while keeping the front and rear width identical.
Since the rear wheels are 1/2 inch wider, I'd like to stretch the tire as little as possible, thus going to 235. I'd go to only 245, but would there be a point (for snow traction)?
Since I'm doing a swap to DWS's, these will stay on the car all the time so I was wondering if the reduction in rear contact patch would noticeably degrade the handling.
10-11-12, 12:04 PM
#39
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So going w/ 235/40 - 18 rears; when my Odo reads 97, 600 miles, it's actually been driven 100, 000?? If so, that's pretty nice. Score one for just a little more resale value
10-11-12, 05:23 PM
#43
This is not exactly what you wanted, but here is a pic from last winter. Tire size is 225/40/18 front and 225/45/18 rear at stock ride height. Keep in mind these tires are 5 years old so the tread is lower than it would be on a new tire, which is why I'm buying a new set for this winter.
10-11-12, 05:58 PM
#44
Lexus Test Driver
I ended up doing the rear size all around. A little wider, but still better than 4 seasons. I got a good deal on Kijiji from someone whose lease was coming due and sold me a set of 5 spoke Alloys with dunlops 245/45 17 for $375. About 2 winters worth of threads left on the tires.
Last edited by My0gr81; 10-12-12 at 04:36 AM. Reason: corrected sizing from 225 to 245
10-19-12, 09:37 AM
#45
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If I go w/ 235/40 - 18 in back, anyone think the wheel gap will become really ugly?
Used 1010tires' tire calculator to crunch #'s, then tried to use them to visualize based on the pic from above (w/ the 225/45-18's in rear). I'm not a "slammed" person by any means and am happy w/ the way it looks now, but certainly don't want the monster truck look to take effect.
Used 1010tires' tire calculator to crunch #'s, then tried to use them to visualize based on the pic from above (w/ the 225/45-18's in rear). I'm not a "slammed" person by any means and am happy w/ the way it looks now, but certainly don't want the monster truck look to take effect.
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