I have recently purchased the XF07 700c front hub kit with 17Ah battery & fitted to a tandem.
The first 100 mile is under the belt & I am more than satisfied with the performance of motor hub and battery so far. The only small niggle, & it is small (but if I were following an Audax route it could be annoying) is the discrepancy with the speed & hence odometer.
The speed sensor is fitted to the rear seat stay securely & within 5mm of the spoke magnet. The red led on the sensor briefly illuminates on each passage of the magnet & the speed displayed on the KM-529 LCD display is fairly steady (i.e not erratic).
With 700c wheel size option entered into the KM-529 the displayed speed is just over 15% in excess of actual speed - i.e 15mph on the KM-529 equals about 12.6mph. I also checked over a fixed 10 mile course and the KM-529 displayed 11.7 miles. I have just entered a 24 inch wheel size option & that has brought the error down to about 2.5%. Unfortunately there is no wheelsize option for 23.4 inch which would see the meter accurate!!
Hopefully I am not coming across as a total pedant!!, but it would be interesting to note what associated wheel circumferences are tabulated against specific wheel diameters in the factory settings.
Anyhow, I remain very happy overall and the 24 inch wheel size option gives a sufficiently accurate speed/distance for my purposes, although it would be interesting to establish if anyone else encounters a similar discrepancy.
Cheers, Simon
The first 100 mile is under the belt & I am more than satisfied with the performance of motor hub and battery so far. The only small niggle, & it is small (but if I were following an Audax route it could be annoying) is the discrepancy with the speed & hence odometer.
The speed sensor is fitted to the rear seat stay securely & within 5mm of the spoke magnet. The red led on the sensor briefly illuminates on each passage of the magnet & the speed displayed on the KM-529 LCD display is fairly steady (i.e not erratic).
With 700c wheel size option entered into the KM-529 the displayed speed is just over 15% in excess of actual speed - i.e 15mph on the KM-529 equals about 12.6mph. I also checked over a fixed 10 mile course and the KM-529 displayed 11.7 miles. I have just entered a 24 inch wheel size option & that has brought the error down to about 2.5%. Unfortunately there is no wheelsize option for 23.4 inch which would see the meter accurate!!
Hopefully I am not coming across as a total pedant!!, but it would be interesting to note what associated wheel circumferences are tabulated against specific wheel diameters in the factory settings.
Anyhow, I remain very happy overall and the 24 inch wheel size option gives a sufficiently accurate speed/distance for my purposes, although it would be interesting to establish if anyone else encounters a similar discrepancy.
Cheers, Simon
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