Correcting Odometer Error on Das-Kit C7 (Metro)

[Jim U]

Hello all. This is first post. And also first e-bike. I must say, I love this Magnum Metro. Exceeds my expectations. However, the trip odometer is a whopping 4.5% off. A known 9-mile route racks up 9.4 miles. That's a mile in 27! I used to have a bike computer on a pedal bike, either Cat-Eye or Specialized, that allowed me to fine tune the accuracy of the odometer by tweaking a mm or two out of hundreds for the tire circumference. I found my way into the configs, and only see a couple of tire widths for a 26-inch tire. I think a 210 (original), and a 195. I assume it is for 2.1 inch and 1.95 inch. My question is, is there a way into a parameter to fine-tune the odometer accuracy? Although I love the C7 display, the accuracy is horrendous. Thanks.

 

[Figs]

I have the C-7 on my UI6, but never messed around with the tire size. So, can’t help you with that. I do know tire pressure effects it, as well as weight (tire compresses more). I also know that nothing is 100% accurate. Even the gps on my phone and Garmin seldom match.

 

[Jim U]

Thanks Figs. I learned on tonight's ride that the tire pressure does indeed have a few 10ths of a mile difference over 10 miles. I changed the C7's tire selection a couple nights ago from a 26x2.10" to the only other 26 choice of 26x1.95 and that brought it almost dead nuts on. Then I brought tire pressure up tonight before ride from 35 to 48 psi, and the new tire choice that was almost perfect, registered 3 tenths lower again. Originally the 26x2.10 selection read 3 or 4 tenths of a mile higher than actual. So I learned that more pressure racks up less miles. So tomorrow's ride will be on the original setting of 26x210 (Schwalbe Big Ben tire is actually 26x2.15), but I will pressurize closer to the max pressure of 55 psi. I miss being able to tune the roll-out number, one mm at a time on prior bike computer, to dead on accurate. Dont know how to access that level on the Metro's C7. Thanks for taking time to reply.

 

[Figs]

Sounds like it will work out. I rum my Big Bens around 45-48 psi, ride is a little rougher, but there is also less rolling resistance.