To those running 275/70R18 tires!

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03-10-2013, 09:48 PM

#11

DRVR6415

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I just went from 265/70/17 to 275/70/18 yesterday. My speedo was off 2 mph.

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03-10-2013, 09:53 PM

#12

BassAckwards

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Quote:

Originally Posted by dannofx4

Quick question...I have a 2013 FX4 supr crew with the six spoke 20 inch wheels...

Are they 20 x 9 or 20 x 8? or 8.5??????
I can't seem to find info anywhere.

Also...the 18 inch wheels on the FX4...what are their width????

Thanks

20x8.5
18x7.5

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Darkz (09-28-2013)

03-10-2013, 09:54 PM

#13

BassAckwards

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Quote:

Originally Posted by Mudweiser

Another question, how far off will my speedometer be off by going up one size the the 275/70r18s.

About 2-3mph at most I think is what it was. It's only an inch bigger than stock.

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03-10-2013, 09:56 PM

#14

Ford-Dude82

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Quote:

Originally Posted by Mudweiser

Another question, how far off will my speedometer be off by going up one size the the 275/70r18s.

At 60 mph you will be traveling at about 62.4. This has been verified by math and radar. At 35 mph radar barely reads 36. I have the same tires on my stock wheels.

Best regards.

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Mudweiser (03-10-2013)

03-10-2013, 10:03 PM

#15

Mudweiser

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Quote:

Originally Posted by Ford-Dude82

At 60 mph you will be traveling at about 62.4. This has been verified by math and radar. At 35 mph radar barely reads 36. I have the same tires on my stock wheels.

Best regards.

Math question, I normally cruise at 75mph, how fast will I really be going? The dealer can make some fine adjustments to the computer that may fix it. But I'd like to know just in case. Lol

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03-10-2013, 10:07 PM

#16

BassAckwards

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Quote:

Originally Posted by Mudweiser

Math question, I normally cruise at 75mph, how fast will I really be going? The dealer can make some fine adjustments to the computer that may fix it. But I'd like to know just in case. Lol

About 78 tops. Somewhere between 77-78

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Mudweiser (03-10-2013)

03-10-2013, 10:11 PM

#17

Ford-Dude82

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Quote:

Originally Posted by Mudweiser

Math question, I normally cruise at 75mph, how fast will I really be going? The dealer can make some fine adjustments to the computer that may fix it. But I'd like to know just in case. Lol

My math may be off, but I would bet between 73-74.

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