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Thread: Will 245 40 18 tyres fit?

  1. #1
    Regular Member Ziggy's Avatar
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    Vehicle : Saab

    Trim : 9-3 Vert

    Engine : 2.0

    Year : 2000

    Default Will 245 40 18 tyres fit?

    As above. I presume these will be fine on my standard elite? What if it was lowered by 30mm woul dthis still be ok?

    I know about speedo issues etc

    Or should I just stick with 235 40 18?

    The rim width im considering is 8j and the offset 42 if this makes a difference?

    Thank you in advance

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    Regular Member Caveman_nige's Avatar
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    Vehicle : Vectra and a Signum

    Trim : top of the line in both

    Engine : Z18XE,Z19DTH,Z20NET

    Year : 2006

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    i think signumboy has 245s on his 20inch rims.. send him a pm

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    Regular Member Ziggy's Avatar
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    Vehicle : Saab

    Trim : 9-3 Vert

    Engine : 2.0

    Year : 2000

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    Will do,

    Cheers

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    Im on 235's on 17" rims theres loads of room to go wider

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    will fit fine

    am on 245 35, ET 35

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    As a guide, and if we consider 215/50/17 to be the standard tyre size, the recommended 225/45/17 is the tyre with the least overall circumference and radius. It's about 2% less than the 215/50/17 (which is why it looks smaller in the wheel arch), which means that for every 100 revolutions of the 215/50/17 the 225/45/17 has to revolve twice more over the same distance.

    Conversely the recommended 225/45/18 are 2% larger, overall, than the 215/50/17s and therefore revolve only 98 times compared to the 215/50/17s 100 revolutions in the same distance covered.

    The recommended 235/35/19s are about the same spec size-wise as the 215/50/17s.

    Anything above or below these specs will have too much of an effect on the speedo reading.

    Here's a good tool for checking correct tyre specs> http://www.miata.net/garage/tirecalc.html
    Last edited by diesel dog; 26th December 2010 at 14:06.

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    Quote Originally Posted by lazy_arse_pie View Post
    will fit fine

    am on 245 35, ET 35
    Are those 245/35/20s ?

    I'm presuming that you've had your speedo recalibrated?!

    Those will under-read by nearly 4mph, compared to 215/50/17s, at 70mph, and that's not including the usual over-optimism of VX speedos!

    I wouldn't want to be chancing the '77mph' absolute maximum on those!

    Nice wheels though.

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