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Thread: Evo X Wheel and Tire Sizing Fitment Guide

  1. #1
    Amateur Pornstar Treyzian's Avatar
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    Cool Evo X Wheel and Tire Sizing Fitment Guide

    More info will be added as well as pictures.

    Guide Overview

    This guide is meant to review the different aspects of wheel and tire sizing and fitment. It will not only help you select a properly fitting wheel (cosmetically), but will also help you choose a correctly fitting tire.
    Vice versa, this guide will help you select a tire size for maximum grip and performance, as well as a wheel that will properly fit that tire.

    *For detailed info, please read RED SECTIONS 1 and 2.*
    *For a quick guide, please read RED SECTION 3.*


    1) General Info

    Bolt Pattern of Wheels


    Wheels used on the Evo X must have a 5x114.3 (5x4.5") bolt pattern. For wheels that have two bolt patterns (like 5x100/5x114.3 or 5x114.3/5x120), one of those bolt patterns must be 5x114.3 in order for that wheel to fit.

    Wheel Width

    The common width of wheels for this application can range anywhere between 8.5" and 10.5". WIDTH ALONE MEANS NOTHING. It must be combined with offset to determine if and how a wheel will fit on the car. Where a 8.5" wide +48 offset wheel will fit just fine, an 9" wide +48 offset wheel will not due to the lack of inner clearance with the rear vertical control arms and caliper clearance issues.

    Lug Nut Size

    12 x 1.5mm

    Offset

    Factory Evo X wheel spec: 18x8.5" ; +38 offset ; 5x114.3 ; 67.1mm centerbore (applies to all Evo X models and most Mitsubishi cars)

    Offset is the measured distance in millimeters between the centerline of the wheel and the hub mounting surface (where the wheel hub mounts up against the brake rotor/drum hub).

    The basic principal behind offset is that all things being equal, the higher the offset the wheel is, the more tucked the wheel will be. The lower the offset, the farther the wheel will protrude.

    Example: a 18x9.5" wheel with a +15 offset will protrude out an extra 15mm when compared to a 18x9.5" +30 offset wheel. In retrospect, the +30 offset 18x9.5" will be pushed 15mm closer into the wheel well when compared to the +15 offset 18x9.5".

    Given the many sizes of wheels that are designed for the Evo X (and similar platforms) offset should be between +15 and +38 (depending on wheel width).

    While offset is SOLELY a measurement of wheel parameters, offset does play a role in determining if a certain size tire will fit and not rub any suspension/body components.

    Width/Offset Recommendations

    Here's a reference for offset ranges that can be used safely for different width wheels. Remember that these values will differ based upon suspension modifications.

    8.5": +10 to +38 (Common offset is +38 on OEM wheels)

    9" : +12 to +38 (Less common width = no common offset)

    9.5": +15 to +30 (Common offset is +15 such as RPF1's)

    10": +15 to +22 (Less common width = no common offset)

    10.5" : +15 to +22 (Common offsets include +15 and +22. While both are used, +22 fit the best due to less poke)

    Hubcentric Rings

    The principle of hubcentric rings is as follows:

    You have 3 spinning circular objects (the axle hub, the brake rotor, and the wheel/tire combo). So just imagine a small circle (axle hub), a bigger circle (brake rotor), and the biggest circle (wheel/tire combo). The ideal situation is to have the center most SINGLE POINT of all three circles to be exactly the same. If one circle isn't spinning on the same axis as the other two, the total motion of all three circles combined won't make a circle, but instead will combine to make an oval. Imagine if your wheels and tires were shaped like ovals, you'd get vibrations at speed.

    The hubcentric ring compensates for differences between the centerbore of the brake rotor and axle hub, and between the centerbore of the wheel and axle hub. It allows the brake rotor and/or the wheel/tire combo to be better positioned on the hub so that the center most point of all three parts are the same. In the case with my current SSR wheels, the centerbores are bigger than the centerbores of the axle hubs so the center most point of the wheels isn't the same as the center most point of the axle hubs.

    Here's what a hub centric ring looks like:



    Here's what a centerbore looks like without a hubcentric ring:



    Here's what the centerbore looks like with a hubcentric ring:






    So lets say that you order a set of wheels that have a 73.1mm centerbore, you'd have to order centering rings that have a 73.1mm outer diameter and a 67.1mm inner diameter. If the wheels have a 75mm centerbore, you'd need rings that have a 75mm outer diameter with a 67.1mm inner diameter.

    Recommended Tire Sizes (Performance, not "Stance")
    18x8.5" - 245/40-18
    18x9.0" - 255/40-18 ; 255/35-18
    18x9.5" - 265/35-18
    18x10" - 275/35-18
    18x10.5" - 285/35-18 ; 285/30-18

    19x9.5" - 265/35-19 ; 265/30-19
    19x10" - 275/30-19
    19x10.5" - 285/30-19 ; 285/25-19

    Example:

    In the tire size 265/35-18, 265 is the section width of the tire in millimeters. 35 is the aspect ratio (percentage) of the sidewall compared to the section width of the tire.

    Example: the sidewall of a 35 series tire is 35% of the section width of the tire, which is equal to 92.75 millimeters for a 265/35-18 tire. The last number in the tire size is the required rim diameter needed to mount a specific tire.

    This link will give you a good idea about changing your tire size and the effects it'll have on your speedo/odometer:

    Tire size calculator

    If you decide to use ANY tire size that's not listed in the aforementioned size list, you WILL experience noticeable negative effects in the accuracy of your speedometer, odometer, ABS (Anti-lock Braking System), and (TCS) Traction Control System, which can and more than likely will decrease passenger safety... Take this statement close to heart.

    2) More Complex Aspects

    Lowered Suspensions & Different Wheels

    Now that you hopefully understand what offset is and the parameters surrounding tire sizes, it's time to combine the two.

    A common question on this board is "Will I rub?" or "Will this fit?" Offset plays very little a role in determining if your FRONT TIRES will rub on something inside the wheel well. Offset plays a large role in determining if your wheel/tire combo will rub the REAR control arms. To reiterate, offset is very important in determining if a wheel/tire combo will rub in the rear, but not nearly as important in the front.

    Alignment: It's Effect on Performance as well as Fitment

    An alignment is
    crucial to your new wheel/tire setup. It not only provides you with maximum grip, but can also be manipulated to fit different sized wheels better.

    "Aggressive Street" Alignment
    The general rule of thumb is:
    Front:
    Toe: 0*
    Camber: -1.5* to -2* each side
    Rear:
    Toe: 0* (or the stock 3mm toe in)
    Camber: -1*

    The "Aggressive Street" Alignment is optimized for decent treadwear while maximizing traction. Alignment specs should be customized to your personal driving habits as well as the driving environment. Please speak with your Alignment specialist for specifics.


    Fender Modifications

    Generally, the width that you will need fender modifications for is 9.5 and wider (18" wheels).

    18x9.5" +22 : No rolling necessary.
    18x9.5" +15 : Slight rolling needed in the rear
    ; front rolling is optional.
    18x10.5" +22 :
    Slight rolling needed in the rear ; front rolling is optional.
    18x10.5" +15 : Rolling needed in the rear ; Slight rolling needed in the front ; Pull is optional

    3) The Simple Short QUICK Guide Remember that these values will differ based upon suspension modifications.

    Wheel Sizes Proven to Work Well

    Wheel sizes that are most commonly used for the Evo X:

    18x9.5" +15 (Best 9.5" fitment ; arguably Best wheel fitment cosmetically for the X)
    18x9.5" +22 (Good fitment for stock to moderate drop)
    18x10.5" +15
    18x10.5" +22 (Best 10.5" fitment ; arguably Best width for performance for the X)

    Recommended Tire Sizes (Performance, not "Stance")

    Tire sizes that are most commonly used for the Evo X:

    18x9.5" - 265/35-18
    18x10.5" - 285/35-18 ; 285/30-18

    Fender Modifications

    Fender modifications that are necessary/recommended for the Evo X:

    18x9.5" +22 : No rolling necessary.
    18x9.5" +15 : Slight rolling needed in the rear
    ; front rolling is optional.
    18x10.5" +22 :
    Slight rolling needed in the rear ; front rolling is optional.
    18x10.5" +15 : Rolling needed in the rear ; Slight rolling needed in the front ; Pull is optional
    Last edited by Treyzian; 08-20-2013 at 09:29 PM. Reason: Guide was consolidated from car forums, tech articles, and personal knowledge. General Info Credit: Phil of C3G.

  2. #2
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    Specific Wheel Information


    • Enkei NT03 18 x 9.5 +27 OFFSET WILL NOT CLEAR CALIPERS
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  3. #3
    Quote Originally Posted by drmosh View Post
    Specific Wheel Information


    • Enkei NT03 18 x 9.5 +27 OFFSET WILL NOT CLEAR CALIPERS
    10mm spacer?

  4. #4
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    Quote Originally Posted by Flying View Post
    10mm spacer?
    Definitely recommended if you plan to run the NT03...
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  5. #5
    Good write up man. Many questions will be answered for noobs.
    _ejay

  6. #6
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    Very good write up wish I had read this sooner

  7. #7
    So if I have on my Evo x mr tire size 255/40 18
    And want volks racing wheel, what size should it fall under? I know its 18x9 but for offset of wheel confuses me. confused on offset, sorry for newbie question xD.

  8. #8
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    I'd probably look at 18 x 9.5. A 255 is going to work even better on that width and the X has the room to fit the 9.5 pretty easily.

    For offset I would look at a +25 or +30, somewhere in there.

    What is Offset? https://www.tirerack.com/wheels/tech...wheel%20offset

  9. #9
    Quote Originally Posted by Apex Hunter View Post
    I'd probably look at 18 x 9.5. A 255 is going to work even better on that width and the X has the room to fit the 9.5 pretty easily.

    For offset I would look at a +25 or +30, somewhere in there.

    What is Offset? https://www.tirerack.com/wheels/tech...wheel%20offset
    Thank you, but would there need to be any modification? If I get those size?

  10. #10
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    A friend of mine is using 18x9.5 +25 w/ 265 width tire. He uses the car at the track and on the street, and definitely puts it through its paces. He has not had any problems and did not roll his fenders. His car is only a little bit lower than stock, but even when the car is getting pounded on out at the track and the suspension is being cycled from full droop to full compression he is not having problems. I would not hesitate to use this wheel/tire combo on my X.

  11. #11
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    FWIW, I used to run 18x9.5 +22 Volk ZE40 with a 265/35/18 on my Evo X. It fit with coilovers but it would rub on hard cornering. Perhaps the 255/40/18 would have fit better.
    2006 Lancer Evolution IX SE TB
    2014 Lancer Evolution X GSR
    PB, S+S *GONE*

  12. #12
    Canyon Racer nicklulu's Avatar
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    255/40/18 +22 to +25 should not have any issues.

    I miss my super advan racing ver.2s man
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  13. #13
    I am looking at a set of Rs05rr
    18x10.5 +35 face R (more concave)
    On 265/35 Falken Azenis With this fit an Evo x on coil overs?

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