New Tires in my future - Sizing questions on stock rims

Discussion in 'Fiesta ST Wheel and Tire Upgrades' started by DirtyBlueshirt, Jun 12, 2014.

  1. DirtyBlueshirt

    DirtyBlueshirt Active Member

    So, after a road incident yesterday morning, (See below), I will be running my stock rims and wheels again for a while. I'll need to see if my rim can be repaired, but more importantly, I need to get some new rubber. I noticed that the Dunlop Direzza ZII tires have no stock in the 205/40R17 size native to the ST's rims. TireRack does have stock in 215/40R17 (10mm wider) or 205/45R17 (5% more sidewall). Obviously the 205/45 will fit, but will the 215/40 fit? In reality the additional width is negligible so I don't think it's an issue, but what's your suggestion? Taller or wider?

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  3. Kevin R

    Kevin R Member

    Keep in mind the 215/40 will be wider AND taller than stock. They'd still have a slightly shorter sidewall than the 205/45 though. If it was me and I couldn't wait for stock size, I'd go with the 215's just because they're closer to stock diameter so the speedo wouldn't be off as much. 215 width should be fine on the 7 inch wide stock wheels, 225 would probably be the max.

    Sorry about your wheel, that sucks.
    Last edited: Jun 12, 2014
    rcl4668 likes this.
  4. DirtyBlueshirt

    DirtyBlueshirt Active Member

    True though the difference 40% of 205 and 40% of 215 are negligible (4mm), where the 205/45 is basically a centimeter taller in the sidewall.

    205/40 Sidewall: 82mm
    215/40 Sidewall: 86mm
    205/45 Sidewall: 92mm

    I know both will probably look near identical, but is there an advantage of one over another?
    Swoopdown likes this.
  5. Kevin R

    Kevin R Member

    Everything else being equal, more grip with a wider tire :)
    rcl4668 likes this.
  6. eRic

    eRic Active Member

    215/40R17 should be fine on the OE 17x7-inch wheels. That is the size I used on a set of 17x7-inch SVT Focus wheels on my 2011 Fiesta.
    rcl4668 likes this.
  7. limbo

    limbo Active Member

    215/40-17 would be a great size. No way you'll run into issues.

    (BTW if you haven't driven on the Z2's you will love them)

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