Gryphon ordered! But have a couple questions.

[Jackpine]

I've noticed Bill seems to use a "squish" value that is less than what I've found works for me. If the unloaded circumference is about 2793mm, I would actually try 2709mm, which corresponds to a 3% reduction due to "squish".

However, anything you try (and your numbers seem reasonable too) is just a starting place. Plug it in and see how close the Gryphon's speed reading is to a GPS or how close it is to driving a measured mile at a constant speed and dividing the time in seconds into 3600. Adjust as necessary to make the Gryphon match the GPS or computed speed. (The dash speedo usually reads about 3% faster than the actual speed, by the way).

- Jack