Michelin pilot sport a/s 3+ 235/45R18 or 245/45R18?

  1. et4891

    et4891 Member

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    Finaly, I am going to get my rim + tire changed, but then I was reading some posts again such as https://www.civicx.com/threads/fast-wheels-winter-setup.16882/ which got me indecisive again :(
    I will be getting a fast wheel 18x8 and Michelin pilot sport a/s 3+ in a 235/45R18 but after reading that post I am thinking if I should get the 245/45R18.

    I even live chat in tirerack.com but guy said 245/45R18 is actually too tall and will rub. But with that post I read, doesn't seem like it's too all and will rub though.

    Any ideas?
     
  2. TypeSiR

    TypeSiR Senior Member

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    For the CTR on 18x8, go with 245/40/18 to minimize speedo error and to avoid any rubbing.
     
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  3. tinyman392

    tinyman392 Senior Member

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    I'm currently running Enkei Raijins 18x8 with 245/40/18 PS AS3+ tires right now. I would personally recommend either going with 245/40/18 or 235/40/18 to minimize the speedometer error. 245/40/18 will read higher while 235/40/18 will read slightly lower in the speedo, 245/40/18 will have less absolute error. However, if you're planning on having any snow or anything of that nature, then the thinner tire will be better for traction in weather while the wider tire would be better in dry.
     
  4. TypeWavey

    TypeWavey Free The Wave

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    He’s asking about a 45 series tire tho. I think 45 is too tall on 18+ wheels for this car. While I was looking at tires yesterday I saw that 45 series were generally cheaper than 30-40, but it wasn’t until I went on tiresize.com and looked at the comparison to stock wheels/tires and saw how massive they were.
     
  5. fatherpain

    fatherpain Senior Member

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    Thank you, would this be for lowered or stock height please. I haven’t looked much into aftermarket wheel setups yet, heh.

     
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    et4891

    et4891 Member

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    Too tall was what tirerack person said but then that post link I shared said his is 45 and that it feels better handling and so? I am confused haha
     
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    et4891

    et4891 Member

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    I don't do tracking but I do want handling to be as close to original as possible as the handling is awesome. I live in Vancouver BC so it does snow a bit during the year and a heavy one every few years.
    So in this case you would suggest a 235/40R18 instead 235/35R18?
     
  8. tinyman392

    tinyman392 Senior Member

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    Unfortunately you probably won't be able to keep the tight taught handling characteristics of the car with that a large tire sidewall. If you wanted to go 235 wide, I'd go with a 40 aspect ratio personally. The taller sidewall will lead to a more comfortable ride though which is well worth it for everyday work.
     
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    et4891

    et4891 Member

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    Doesn't really have to go with 235, just that I was recommended that 235/35R18 because I am really inexperienced with car but like driving and pretty much drives everyday.
     
  10. tinyman392

    tinyman392 Senior Member

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    The 235/245 doesn't really matter in terms of the steering feel and sharpness you'll lose. In order to use an 18" wheel, you'll have to have a total of 2" more tire wall to make up for the smaller rim size. That's what will change your overall handling of the car in general. A lot of members use 19" as a compromise between comfort, rim size, and steering sharpness. The major downside of 19" is that tires are more expensive and the rims are generally as well. Though in the 19" range, there is the Motegi MR924 which should actually keep much of the offset that the CTR has stock which will reduce torque steer.
     
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    et4891

    et4891 Member

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    I did look into that mr924 19 inch but really as you mentioned the price. For what I am am thinking now with 18" and tire its approx 2200cad but with the motegi it's approx 4200cad almost double

    By the way, sorry to be noob and ask, so the offset is what will make a difference with the handling
     
  12. tinyman392

    tinyman392 Senior Member

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    The offset actually would deal mainly with the torque steer. As you go further away from the +60 offset of the wheel, the car will gradually have more and more torque steer. The thicker tire walls create a softer feeling suspension overall (remember, the tires are part of the suspension system) making it not as sharp or direct as a stock setup would be.

    I'm running a +42 rim right now on 245/40/18s, and I do notice the slight torque steer under heavy acceleration. It's only slight though and nothing too major. I've adjusted to the softer suspension feel though.
     
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    et4891

    et4891 Member

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    I ordered an 18x8 +40 offset with 245/40R18 gonna install it in approx two weeks :D
    I quoted this because I know you mentioned the setup will minimize speedometer error and for me setup it'll read higher right?
    Do you know approx how much higher? So like if speedometer reads 50 it's actually 55? or 60? What should I except here?
     
  14. TypeSiR

    TypeSiR Senior Member

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    It’ll be unnoticeable as tire will only be 0.3% smaller than stock diameter. 60 mph on the speedo means you’re actually going 59.8 mph.

    https://www.wheel-size.com/calc/?wh...40-18X8ET40&fcl=50mm&scl=50mm&wcl=30mm&sr=0mm
     
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    et4891

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