Tire size

[Mjmcknight0]

I put on terra grap 285/70/17s I measured the exact circumference (2618), I put that into forscan and my Speedo is still off. What number has anyone else used?

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[wkaotp]

Check www.tiresize.com lots of resources there to help.

 

[Mjmcknight0]

Check www.tiresize.com lots of resources there to help.

I’ve put that number in (2609). It’s off

 

[Tricky Dick]

My Badlands with stock 285/70/17s has 2525 as the factory setting.

 

[wyobronco]

So you just measure the outside circumference and change that in forscan?

 

[Mjmcknight0]

My Badlands with stock 285/70/17s has 2525 as the factory setting.

I’ll give that a shot.

 

[Mjmcknight0]

So you just measure the outside circumference and change that in forscan?

Allegedly

 

[F1NDx]

Had similar issue.
Running BFGoodrich All-Terrain T/A KO2 - 265/70R17....4475mm was dead on for me.
(Tire calculator said 2520mm).

 

[jenkinslonewolf]

Had similar issue.
Running BFGoodrich All-Terrain T/A KO2 - 265/70R17....4475mm was dead on for me.
(Tire calculator said 2520mm).

Do you mean 2475?

 

[Dingbat]

Tires deflect under load so the outside circumference can be too large. Did you try marking the tire and measuring out one revolution on the ground?

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