Tire Size

[Clemson_FX4]

I have the 35x12.50 R18 Nitto Trail Grapplers. I believe the Revs/mile is 592 so I divided that by 1,609,344. To get 2718.48 I entered 2718 as my TS but the Gryphon is still off my speedo. What should I do?

[cleatus12r]

The Gryphon will NEVER read the same speed as the speedo.

Once the tire size is loaded, just watch the speedometer and find a different parameter to watch on the Gryphon screen.

[Jackpine]

Clemson, the TS you entered looks pretty close.

What Cody was trying to tell you is that the speedometer in the dash always reads about 2-3 mph higher than it should due to mechanical effects. But, if the Gryphon shows a correct speed (which you can verify by a GPS among other methods), you've set things up correctly and your odometer will be correct.

Now you can use the dash speedo and hold a speed 2 mph above the speed limit and be legal (at highway speeds)! However, the error drops at lower speeds, so in a school zone, don't drive faster than what's posted.

- Jack

[Clemson_FX4]

Thanks for the help guys. Ill try to match the gryphon speedo with a GPS or something of sorts to make sure my odometer is correct.

-Chase