April 1, 2012
[EDITOR'S NOTE: A customer recently asked Bike Friday Head Designer Rob English about combining a NuVinci 360 hub with a Gates Carbon Belt Drive system. Previously Bike Friday did not offer that combination. Now we proudly can offer it. Here is what Rob had to say:]
We hadn’t previously offered the Gates Carbon Drive with the NuVinci, initially because of the availability of the proper cog and because the gearing ends up very low on the tikit’s 16-inch wheels.
However, it is actually not any worse than the 60×22 Alfine 8-speed. The NuVinci runs from a 0.5 reduction to a 1.8 overdrive. So with 60×24 drivetrain this gives 20 to 72 inches. Not ideal, but useable. I had a tikit with 53×18 and the 8-speed for a while, which gives 25 to 76 inches.
That was fine for around town on the flat. If we could persuade NuVinci/Gates to do a 20T sprocket at some point that would be ideal (24 to 86 inches). But the last time I spoke with them they were clear that it would only be a 24T.
I would say that if the gear ratios will work for you, then the Gates+Nuvinci would be a reliable, durable solution, and knowing that the cog is available we can certainly build it for you.
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