I'm running a trail tech endurance odometer and just got the new GT fat front tire. I've had terrible luck trying to measure tires in the past. I come up way off from The stock KTM odometer that is used to set most of the local time keepers around here. What is the recomended diameter for the GT216 on a trail tech odometer? Thanks
Get some white paint / Tippex / Idiot Ink and make a line across one of your knobbles (on the tyre !) Get on the bike and push it along some tarmac. Measure the distance between the lines (you may have to do this a couple of times to get the right amount of fluid on the tyre before it dries) I set up my Trail Tech this way - first time out I cam across a mobile speed camera, so I asked the nice man behind the camera to clock me, and it was spot on. Matches up with the Sat Nav too Mike
Hey AG, I use the same method as Mike... with a slight mod: I do 2 or more revolutions to get a linear distance and then divide that total by the number of wheel turns. This reduces any error. here's an excerpt from a thing I wrote almost 10 years ago: ============ If you are an A-R engineer type and want spot-on odometer readings on your Endurance (or any other type of computer that uses wheel size), use this method to get a highly accurate wheel circumference measurement for calibration (requires a 100'+ tape): mark a front tire knob with oil or chalk (or whatever will show up on the smooth straight surface you're measuring on) and then push the bike a good distance (say about 40-60 feet. Whatever) replenishing the chalk/oil/paint on the knob as needed (first and last marks are the most important, though). Now, from the edge or middle of the first knob mark (mark #0) on the ground, measure to the edge or middle (depending) of the last one (say its mark #5, the sixth one) and divide by 5 (in this case). This method distributes the error of measurement and gives you an accurate tire circumference (mine was 2139mm IIRC). BTW, my 200' tape has metric on it also, so maybe yours does too. Super-duper A-R types will do this with someone sitting on the bike to get that 1.5mm difference in circumference. ============ With a normal front tires, the differences aren't that great; but if you're running a 216AA fatty you really need to measure it... it's gonna be much bigger. good luck
Hey Auto5guy- I just installed a Trail Tech Endurance II on my TE310r (ez install: electrical plugs match, bolt pattern is the same as stock). I used the above methodology 'cept with 10 revolutions of my GT 216AA Fatty and got 2181mm (man, it's a big tire). I used spray lithium grease (white grease) as the knobby marker, which showed up on the asphalt fine. Because I went 10 revolutions AND my 200' tape has metric on the other side... there was zero math involved (21.81 meters); just move the decimal place over twice (well, ok- actually shift it once left for the 10 revs, then shift it right 3 places to convert to millimeters; but you know what I mean). The tire was at 11psi. I haven't measured the accuracy yet, but on my first-gen Endurance (and it's older brother the Panoram) it was good for inches-on-the-mile. It also read down to 1/100th of a mile or 53 feet. Weirdly, this new model only gives tenths of a mile on the trip meter. shoot. This speedo is WAY more user friendly than the stock one (and I'm hoping that Trail Tech dint oem those like the ktm deal). Another great Trail Tech product. good luck.
