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Old 05-25-2011, 11:46 AM   #1
DylanFan
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Default 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 11:59 AM. Reason: add something
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Old 05-25-2011, 11:56 AM   #2
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Just subscribing.
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Old 05-25-2011, 12:36 PM   #3
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According to this calculator, it would be off .3 MPH. So, not much.

http://www.1010tires.com/TireSizeCal...?action=submit
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Old 05-25-2011, 12:59 PM   #4
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Originally Posted by poopile View Post
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 01:02 PM.
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Old 05-25-2011, 02:49 PM   #5
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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.
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Old 05-25-2011, 08:49 PM   #6
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I read somewhere that the wheel stops are different for the wider tires. I don't know from personal experience.
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Old 05-26-2011, 07:23 AM   #7
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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
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