I assume that if the Cobi can only use the speed info provided by Bosch via it's CAN bus then the circumference is already dialed-in via factory and/or shop and adjustable via Intuvia or Nyon.I am not familiar with the Cobi settings, but if there is a setting for tire circumference, my guess is that it gets its speed from the controller by counting wheel revolutions per unit of time. It has been interesting comparing the speed on the Intuvia display to the speed shown on my Garmin Oregon GPS. The Bosch system seems to inflate the speed and doesn't respond as quickly to speed changes as the GPS does. This is easy to observe if you make a quick stop and the Intuvia will still be showing a non-zero speed for a split second.
Just curious, what makes you prefer the Homage to the Powerfly?Calibration of wheel circumference …
Based on my limited experience with Bosch computers:
Yesterday's ride on the Kiox-equipped Homage was recorded as 88.5 km on both Ride with GPS (running on my iPhone 6) and the Kiox display. According to both the Kiox and my Ride with GPS records, the total distance ridden on the Homage is 3297 km.
- Purion – not possible for user to set wheel circumference.
- Kiox – straightforward to set circumference in 1 mm increments between 2080 and 2290 mm.
The Purion's recorded distance is at best an approximation. Ride with GPS claims (correctly, I think) that the now largely-neglected Trek Powerfly 5 has travelled 4436 km but its Purion is more optimistic claiming that it's covered 4625 km. This is a daft state of affairs akin to owning a watch that can never be set it to the correct time.
Lerxst …What makes you prefer the Homage to the Powerfly?
I have a Powerfly 5 and wish I had a rear suspension. How do you compare the ride between the Powerfly 5 and the Homage?Lerxst …
It's not Purion versus Kiox, so I'll have to go off-topic for a moment!
Yesterday's ride would have pushed the Powerfly to its range limit – at 88 km, feasible but I'd have been watching the Purion's display rather carefully.
- Control Technology – superb full suspension designed for trail and road rather than mountain biking.
- Rohloff electronic IGH
- Gates belt drive
- 1 kWh dual battery
- dramatic, rugged appearance
On my 'everyday rides' on rural washboard roads and the local rail trail the Homage is in its element.
In a way the comparison between Homage and Powerfly is similar to one between today's best passenger-oriented 4x4s and classic military-style 'general purpose' 4x4s.
It is 28 MPH, so I gain minimal speed?
It’s going to depend on your weight, terrain, and fitness level. Personally, I’ve only been able to achieve the 28 mph my bike is theoretically capable of on a steep downhill with a following wind, and I think I’d actually have gone faster on a lighter acoustic bike.It does not make your bike faster. It just takes the upper limit on assisted speed off the system. On a class 1, 20mph bike, it gives you another 8-10 mph, up to 30 realistically. On a class 3, 28mph bike, it only gives you another 2mph and then very infrequently. Faster than that on a pedal assisted bike with 350 watt or less is just not a sustainable speed for most mortals.
Kiox does. It's quite legible but, in true Kiox style, it is displayed on only one screen which is quite likely not the screen that you'll want!Which of the Bosch displays will show rider's cadence during the ride?