Changing stock 17" rims to 18"

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05-25-2011, 10:46 AM

DylanFan

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Location: Owensboro Kentucky

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Changing stock 17" rims to 18"

If I was to change my stock 17" rims on my 2009 Grabber Orange GT to 18" rims how far off would my speedometer be off at say 60 MPH? I am looking at these 18" wheels & tires!

http://www.americanmuscle.com/blackf...0509-stan.html

Thanks

Last edited by DylanFan; 05-25-2011 at 10:59 AM. Reason: add something

05-25-2011, 10:56 AM

Hotwheelracer

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Just subscribing.

05-25-2011, 11:36 AM

poopile

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According to this calculator, it would be off .3 MPH. So, not much.

http://www.1010tires.com/TireSizeCal...?action=submit

05-25-2011, 11:59 AM

Nuke

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Location: PA to KY ('07) to IL ('09) to MS ('10) to FL ('11)

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Quote:

Originally Posted by poopile

According to this calculator, it would be off .3 MPH. So, not much.

http://www.1010tires.com/TireSizeCal...?action=submit

+1 off by .3 MPH at 65 MPH... assuming your stock tires are 235/55/17. And be sure to consider your TPMS.

Last edited by Nuke; 05-25-2011 at 12:02 PM.

05-25-2011, 01:49 PM

poopile

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Yeah, what Nuke said. I have 17" wheels, so I just entered my tire size in. If yours are stock, it should be correct.

05-25-2011, 07:49 PM

Art161

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I read somewhere that the wheel stops are different for the wider tires. I don't know from personal experience.

05-26-2011, 06:23 AM

partsbill

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Quote:

Originally Posted by Art161

I read somewhere that the wheel stops are different for the wider tires. I don't know from personal experience.

I went from the stock 235/55/17 all around to 245/40/18 front and 285/40/18 rear,
I did not install the steering stops and have no issue, I can turn as tight as I can with no rubbing issues, here's what Ford has to say.
For vehicles with 16" wheels from the factory: -installing 17" x 8" wheels, use steering stop 4R3Z-3932-BA -Installing 18" x 8.5" or 18" x 9.5" wheels, use steering stop 6R3Z-3932-CA For vehicles with 17" wheels from the factory: -installing 18" x 8.5" or 18" x 9.5" wheels, use steering stop 6R3Z-3932-CA