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Thread: Raising Car Ideas - Bigger Diameter Wheels?

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    Default Raising Car Ideas - Bigger Diameter Wheels?

    Hello!

    I'm fed up with the front lip of my car crashing against my drive ramp whenever I try to get onto my drive, and being unable to drive up my car ramps with lowered car extensions, and eating curbs whenever I get too close to one!

    So I'm trying to come up with Ideas that will give my car a little lift.

    I've fitted 30mm Eibach lowering springs, and I swear they've lowered the car by more than 30mm... anyway, I would like to raise the car by 10-15mm without having to change the springs to the OEM SRI 15mm springs as I bought the Eibachs to remove the spring breaking problem with this car (and make it look cooler).

    The only ideas I've been able to come up with are:

    Spring Assisters/Spacers
    Bigger Wheels/Tyres

    Since I plan on changing my alloys for something cooler looking anyway, I figured that bigger tyres might be my ticket out of curb munching hell!

    Plus I don't really like the idea of spring assisters, members on this forum have already mentioned how they dislike them and how they can stress your springs more by forcing them to do things they weren't made to do.

    So! Could I get some opinions please?

    I'm currently running 215/50/R17's. -- in order to get a 15mm height increase i'll have to increase the Tyre diameter by 30mm.

    What are your opinions on larger wheels? what are the downfalls? and are those downfalls really all that noticeable? - I understand that bigger wheels will change my speedo to real world speed ratio, and maybe even knock my odometer off by a bit?

    Just need a bit of feedback really, Is bigger tyres a good idea for my problem?

    Thanks!

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    Drazek, if you want to raise by 30mm youll have to fit 60mm bigger tyres mate thats 30mm top and bottom remember

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    Quote Originally Posted by hutch View Post
    Drazek, if you want to raise by 30mm youll have to fit 60mm bigger tyres mate thats 30mm top and bottom remember
    I want to raise the car by 10-15mm not 30mm ;p - ready my thread properly, sorry it was a bit of a long one ;D

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    yeah sorry mate,

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    go to a 235/45/18 and this will give you 22mm extra diameter. but at 70mph on speedo you will be doing 72.3
    or check out this: http://alloywheels.com/tyrecalc.asp

    but you can get speedo recalibrated anyway

    hope this helps mate
    Last edited by hutch; 23rd November 2010 at 13:03.

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    Quote Originally Posted by hutch View Post
    go to a 225/50 and this will give you 31.4mm extra diameter. this will put your speed up by 1mph at 70, ie you will be doing 71.
    hope this helps

    or check out this: http://alloywheels.com/tyrecalc.asp

    Are you sure your reading that right?

    215/50 diameter is - 646.8
    225/50 diameter is - 656.8

    Thats not 31.4mm extra diameter. Its also worth remembering that its never a good idea for a speedo to over read no matter how much although I guess opinions will differ on this.

    Also going up to 225/45/18 takes the diameter up to 659.7 and 235/35/19 up to 647.1.

    So unless your going to go massively over a recommended size then its not really going to make a massive difference.
    Now I need a turbo to keep up!

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    sorry sig just changed it

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    Quote Originally Posted by hutch View Post
    sorry sig just changed it
    Now I need a turbo to keep up!

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    What are your opinions on 245/45/18 ?

    for some strange reason, the cost of tyres at 245/45/18 are a lot lower than the cost for 235/45/18 :S

    apparently there will be a 1mph difference between 245 and 235, I was wondering what problems having my speedo change might cause, but I've read that it's relatively easy to get the speedo recalibrated?

    also, will 245/45/18 tyres be okay on the road, they're not too wide are they?

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    Quote Originally Posted by Drazek View Post
    What are your opinions on 245/45/18 ?

    for some strange reason, the cost of tyres at 245/45/18 are a lot lower than the cost for 235/45/18 :S

    apparently there will be a 1mph difference between 245 and 235, I was wondering what problems having my speedo change might cause, but I've read that it's relatively easy to get the speedo recalibrated?

    also, will 245/45/18 tyres be okay on the road, they're not too wide are they?
    Speedo reads 70mph your actual speed will be 73.35 mph

    They will tram line and you will need an 8j rim imo although they will probably fit on a 7.5j

    Not sure the 245/45/18 is in the tech2 recalibration menu either.
    Now I need a turbo to keep up!

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