Tire circumference getting changed by Gryphon

[Jackpine]

Originally Posted by tmsbandman

Hi all. I decided to try a different tune, and even though I hit "load previous settings" my tire size got wiped. I think the default is 2356. I tried to put in values several times, but then when I go back to is (via load previous settings) it was defaulted back again. I know that I read here that the tire size setting is actually a "revolutions per mile" setting. Can anyone tell me where the "notches" are in the available settings? That way I can save a little frustration. Right now it's at 2691, which is a little big for my 275/60/20 tires. If I can know the built in increments on the Gryphon, it would help. Seems like maybe 2591 may have been my value that worked before.

Thanks

Yes, I think 2591 - 2580 would be about correct for the tires you have. I don't know the "notches" you mention, but since the revs per mile value is always an integer, 621 revs corresponds to 2590 and 624 corresponds to 2580. Since your tire sidewall is not too high, I suspect 2590 is very close to right.

The 2691 you say it's at now is WAY too big. The unsquished value would be 2632.

Now, it really sounds like you went to the Tire Size (TS) in the custom options menu before you went to "Load Previous Settings". To get back your previously entered TS (and Gear Ratio) you MUST choose "Load Previous Settings" as the first step after opening the Custom Options Menu. Again, though, due to the way calculations are performed in the conversion between revs/mile and tire circumference, don't be surprised when you see a small change in the value.

- Jack