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Discussion Starter · #1 ·
I know winter is almost over here in Montreal (we're supposed to get a bit of snow the next couple of days), but I thought I'd throw this out to the members here who get winters with a lot of snow. I know that the OEM tires on the CT200h are 215/45/16 or 215/45/17.

My question is - is there any advantage or disadvantage to using 50s or even 55s in the winter? Would you get a smoother ride with a higher profile tire (more air=better shock absorbtion?). My concern with the 45s is that in Montreal, when spring rolls around, the frequent temperature changes up and down creates a lot of potholes. This spring was noticibly worse than past years. A lower profile would mean that the rim is that much closer to the road surface when you roll into one of these potholes, no? Would mileage suffer?

Thanks in advance.
 

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Changing the profile also requires changing the tire width. If not, the outside diameter of the tire changes - resulting in errors in speed registered on the speedometer and changes to the drive ratio ( probably not an issue with the CT's CVT).

Higher profile requires changing width of tire to maintain constant OD.

Higher profile does not automatically mean taller sidewall.

Also in snow you get better traction with a narrower tire width.

Your solution to get a taller sidewall would be 16" rims.
 

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I know winter is almost over here in Montreal (we're supposed to get a bit of snow the next couple of days), but I thought I'd throw this out to the members here who get winters with a lot of snow. I know that the OEM tires on the CT200h are 215/45/16 or 215/45/17.

[snip]
Shouldn't it be: 205/55/16 vs 215/45/17

I'm not an expert on tires but I think sticking with 205/55/R16 would be better in fuel economy; less surface contact less friction.

Why do they offering 215/45/R17 - this is not a sports car.
 

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Shouldn't it be: 205/55/16 vs 215/45/17

I'm not an expert on tires but I think sticking with 205/55/R16 would be better in fuel economy; less surface contact less friction.

Why do they offering 215/45/R17 - this is not a sports car.
In the US we only get 17" rims
 

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Discussion Starter · #5 ·
I believe the base model (the one that's under $30,000 in the US) has 16" wheels.

Here's a thought. The base model has 215/45/16. The upgrade goes to 215/45/17. That means the overall difference between the 2 sizes is plus 1 inch diameter. So every revolution on the 17 goes 3.14" more than the 16".

So is the odometer different for that of a car delivered with 16s than 17s? If not, then the readings would be inaccurate on one of the 2 no?
 

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I think it is either: 205/55R16 or 215/45R17

There will minimal difference in speedometer reading.
Here is good information:
Tire size calculator

Assuming 16in (205/55) is stock tire, so when you use 17in (215/45) you will be traveling 1% faster. With stock tire your speed 60mph will be 59.4mph with 17in tire.
 

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I believe the base model (the one that's under $30,000 in the US) has 16" wheels.

Here's a thought. The base model has 215/45/16. The upgrade goes to 215/45/17. That means the overall difference between the 2 sizes is plus 1 inch diameter. So every revolution on the 17 goes 3.14" more than the 16".

So is the odometer different for that of a car delivered with 16s than 17s? If not, then the readings would be inaccurate on one of the 2 no?
Only 17's on base and premium in US
According to specs on Lexus web site

Regardless - overall diameter has to be maintained regardless of rim diameter

If you go with 18" rims tire wall height has to be reduced by 1/2" to maintain OD

If you drop down to 16" rims you will get an additional 1/2" of wall height if you size the tire correctly
 

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My plan is to run a 205 or even 195 (if I can find it) Blizzak on the standard wheel and put the OEM tires on a BBS or Fsport wheels. I'll keep the same rolling diameter.
 

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Just to make this clear, Bmoy88 you are writing the wrong sizes of the 16" wheel above!
The standard sizes are:
16": 205/55/16
17": 215/45/17
Boltpattern: 5/100
Centerhub: 54mm

I will go with the 16" version for winter (lives in sweden), and think it will be fine.
 

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Got this picture sent to me today. A nice overview of the standard wheels.
They have same inset for 16 and 17 inch. Perhaps it would look nicer with an inset of 40 than 45 on the 16" wheels. That would make them as far out as the 17", but with 10mm extra clearance inside toward the suspension. Dont know if/how much that would change the handling of the car?



 

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Discussion Starter · #12 ·
I think it is either: 205/55R16 or 215/45R17

There will minimal difference in speedometer reading.
Here is good information:
Tire size calculator

Assuming 16in (205/55) is stock tire, so when you use 17in (215/45) you will be traveling 1% faster. With stock tire your speed 60mph will be 59.4mph with 17in tire.
Just to make this clear, Bmoy88 you are writing the wrong sizes of the 16" wheel above!
The standard sizes are:
16": 205/55/16
17": 215/45/17
Boltpattern: 5/100
Centerhub: 54mm

I will go with the 16" version for winter (lives in sweden), and think it will be fine.
Sorry about that syscon and maxa, you are correct. I misread the size for the 16s. It is in fact 205/55. I guess that means that will be the size to get if I want to get the same OD as the 17s but with a more cushiony ride.
 

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Has anyone driven in Winter yet? Being a FWD should be better than my previous RWD but I am a bit concerned about not being able to turn off traction control if needed. (I know Sport Mode limits the effect of traction)
 

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Discussion Starter · #14 ·
Does anybody know what would be the effects of using a 215/55 instead of a 215/45 on the 17 inch rims? As I said before I am really worried about the potholes in spring here in Montreal. I'd feel more comfortable with a higher profile for a more cushiony ride. Would this extra height affect turning in any way?
 

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Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
215/45-17 3.8in 12.3in 24.6in 77.3in 819 0.0%
215/55-17 4.7in 13.2in 26.3in 82.7in 767 6.9%
 

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Discussion Starter · #16 ·
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
215/45-17 3.8in 12.3in 24.6in 77.3in 819 0.0%
215/55-17 4.7in 13.2in 26.3in 82.7in 767 6.9%
Thanks for the info Darkride. Now. are there any negative effects of going with larger tires? The positive I can see is gaining a few more clicks on the odometer for the maintenance schedule and for those who are leasing.
 

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As long as there is 1.7in gap between stock wheel and fender then there shouldn't be problems with steering/rubbing.

You've already stated the pros, but here are some possible cons:
- you may notice difference in steering - softer (car won't turn as directly)
- brakes will have to work harder (could throw off antibrake system, stability system)

You could talk to you dealers garage, they know best and they can sometimes recalibrates the speedometer, ABS, etc.
 

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sorry to bump an old thread, but i will be picking up my car in november so i have been looking into what i should do for snow tires.

I wanted to grab a set of steelies at first, or some kind of 16 inch lexus rims, but i figured that the stock 17s will go to waste if I get the f sport trident rims for the summer...

i know 16s are supposed to perform better in snow due to side wall issues and the thickness of the tire, i did a little bit on the calculations and would like to see if you guys feel the same way.

16s
P205/55R16
so 205mm
55% of 205mm = 112.75mm




17s
P215/45R17
so 215mm
45% of 215mm = 96.75mm




The Difference
16s vs 17s
width of tire = 16s will be 215-205 = 10mm thinner = 1cm
sidewall of tire = 16s will be = 16.75mm taller = 1.6cm



i decided to go with 17s so dont waste the stock rims, (tech pkg so not the 16s) as the calculations show only 1.6cm in diff for the sidewall, and 1cm in thickness. it may handle differently ever so slightly, but i doubt i can feel any difference. What do you guys think?

Thanks in advance =D
 

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I'm a bit of an idiot when it comes to tires; i'll be getting the tech pkg so that puts me at 215/45R17 stock,

my current winters are 215/60/16.

assuming i can change the steelies easily if they dont fit, can i keep the rubber?
 

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I'm a bit of an idiot when it comes to tires; i'll be getting the tech pkg so that puts me at 215/45R17 stock,

my current winters are 215/60/16.

assuming i can change the steelies easily if they dont fit, can i keep the rubber?
Sorry, I'm not following you. What is on your car now and what is the concern w/ the steel rims?
 
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