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Lower suspension and larger tires

This is a discussion on Lower suspension and larger tires within the Fiesta ST Suspension forums, part of the Fiesta ST Garage category; I've been doing some poking around here, and for a few reasons I really like the idea of going to a taller tire (215/45/17). The ...

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    Lower suspension and larger tires

    I've been doing some poking around here, and for a few reasons I really like the idea of going to a taller tire (215/45/17). The Fiesta is my daily driver/commuter/family car so adding a little extra insulation and protection for the wheels appeals to me. (I've looked a little bit at dropping a wheel size to accomplish the same thing, but adding the cost of wheels+tires at the same time, and the fact that I like the OEM wheels as well as anything aftermarket I can find means I'm inclined to stick with 17")

    Now the question is, going to a 215/45/17 increases the radius by .5" meaning ride height will increase by about that amount, raising CG etc. Probably not so much that I'd notice, but as an engineer/carguy higher CG=bad.

    Has anyone tried tires this size with lowering springs? Mountune lowers 1.1" in the front, so one presumes there is at least that much "tolerance" for reduced clearance.
    Eibach lowers .8", so .8"+.5"=1.3" less clearance than stock, .2" less clearance than Mountune with OEM tires.

    Is there that much room to play with or do we have a larger tire OR lower springs situation?

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    mackguy: after lowering my car 1", I noticed some rubbing of tires on fender lips, wheel well liner--something! I am planning on getting 215/40 tires and that would not raise the CG as much as your option. What about 205/45? Anyhow, I REALLY need to read about all the guys with lowered springs, etc., and find someplace to roll out my fenders! Good luck!

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    Have 17' X 8' ET 42 rims with 215 40 17 tyres, Mountune springs and no rubbing of any sort.

    My build : https://www.fiestast.org/forum/showthread.php?t=1412
    LT Berzerker and JBO like this.
    2013 Fiesta ST Aus #55
    Mountune : MP215 Kit, Short Shift, Induction Hose, Boost Pipes, Roll Restrictor, Sport springs, Cat Back Exhaust.
    SD Performance Groved & Dimpled Brake Discs with Ferodo DS2500 Pads HEL braided lines & Castrol SRF Fluid
    TRC Splitter, Mountune Wing extensions,Gear gaiter, Shift Knob & mats, Custom painted Engine cover, NB Styling Bonnet strut, Black Vinyl Roof, Plasti dipped Mirror caps & front bar. Koya Drift Tek 17"X 8" with 215/40/17 RE003

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    mackguy: are you using stock wheels? Also, how low do the Mountune springs lower your car? As I or you mentioned earlier, I THINK my problem is that the coil overs were set SOFTER than stock!

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    I have run 215/45-17 and 215/40-17 ; 40-series sidewalls will not rub. 45 series will. 50 series definitely will.

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    I have a set of 215/45-17 Kumho V720 on the car right now with stock wheels. It rubs the frame well at full lock.
    -Chris
    '87 Civic Si
    '91 CRX SiR
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    '91 Civic Wagon RT4WD

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    I think I've decided to go 205/45/17. 215/40/17 is appealing but no Michelin PS-AS3 in that size, and that's the tire I want so that kills it.

    That plus the Eibach shouldn't be much problem, that plus Mountune.. Maybe OK?

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    I run stock tyres and wheels and have lowered my car with H & R springs. No rubbing anywhere and it corners like tomorrow with absolutely no roll.

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    Quote Originally Posted by PeteFiesta View Post
    I run stock tyres and wheels and have lowered my car with H & R springs. No rubbing anywhere and it corners like tomorrow with absolutely no roll.
    How is the ride compared to stock?

    Sent from my SM-N910T using Tapatalk
    2015 Fiesta ST - Red

    1996 Honda VFR750 - Red

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    I have my FiST lowered on Mountune lowering springs, and I just installed 215 x 40 x 17R Kumho Ecsta Le Sport tires on my stock wheels. I've had absolutely no problems with them rubbing at all.

    Hopefully this helps some people with their decision to upsize tires in a similar boat.

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