The setting for the Stock Dunlop 21" Raptor tire is: {1679}.
My wife has a flat cloft measuring tape (for a seamstress) and I measured the circumference and applied the formula on the instructions. Now, this was with 5lbs of pressure in my front tires.

Do your mileage check for a looong distance (ie: 4-5 miles) and be "strict" to the 10ths of a mile! You'll probably see a difference.

"TOID"

half beast/half machine

 

I checked mine with the speed trap at the drag strip.
I shut down at the finish line & looked at my max speed & compared it to my time slip. I was within .02 MPH & that was close enough for me.
I got my inital setting from eRAPTOID.

 

Hey guys,
I programed the trail tech to the 1679. It worked great. I traveled over 100 miles at silver lake sand dunes. My top speed was only 55.8mph. the only thing that looked funny to me about the trail tech was the hr meter part. i spent about 20hrs for the 2 days that i was there and only loged about 6 hrs of ride time. it just seemed like i rode more than just 6 hrs, but i still had a blast. I even took out my 01 ford ranger 4x4 and made it up all the hills.

 

Here's mine with the trailtech:

Raptor w/ Renthal Bars