Exact tire size in tuner to get truck running at dash speed?

[reddevil78]

Hey guys I have a trinity t-1000 for my 2014 ram 1500 running on 35x12.50x20

I set my tire size the first time at 35" and ran it I was 2mph under going 55=53mph. Then I transferred it to metric which equaled 318x60x20 and I was running 2 mph over 55=57 it does make sense to me. What do I have to put on the trinity in order for it to get it calibrated on point? Thanks in advance guys.

 

[07MegaCabRam]

you need to take a tape measure, go outside and measure how tall your tires are. I bet they are closer to 34" tall.

 

[xrsman]

On my 35" duratracs I think I set it up with 35.5" tall and it was bang on with GPS and radar.

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[reddevil78]

Thanks guys yeah I set mine at 34" like mega said and bang spot on perfect