kachou
1 mW
- Joined
- May 11, 2016
- Messages
- 18
Dear fellow ebikers,
I am enjoying an awesome BBSHD / 48V setup that I built with your help (see here: https://endless-sphere.com/forums/viewtopic.php?f=28&t=80352 )
I am now trying to perfect the beast, with the same objective: that my wife can climb Alpine passes at low speeds (around 9km/h) with me (on a non electrical bike), while pedaling a bit (and therefore being at the same cadence as the BBSHD).
With the mighty mini Luna chainring, the chainline was terrible, and I wasn't able to use all the rear cogs. I removed 2 of them and used spacers, but it was still not satisfactory.
So... I bought a second-hand Rohloff IGH 14speed that I found, and I am now calculating the best gear ratios.
However, I was not able to find the default cadence speed of the BBSHD, for each PAS level. <<< this is my question
I understand the motor needs to run fast for best efficiency, but my wife cannot pedal at the craziest speeds.
If anyone is able to help me on this question, it will allow me to choose the gear ratio for my Rohloff:
either 30 front chainring and 13 rear cog or 46 front chainring and 17 rear cog.
My calculations for each gearing:
30/13
Speed at 60RPM for each Rohloff gear (km/h)
1 5,22
2 5,91
3 6,73
4 7,65
5 8,67
6 9,87
7 11,22
8 12,75
9 14,47
10 16,47
11 18,69
12 21,22
13 24,15
14 27,42
46/17
Speed at 60RPM for each Rohloff gear (km/h)
1 6,12
2 6,93
3 7,89
4 8,96
5 10,17
6 11,57
7 13,15
8 14,95
9 16,96
10 19,31
11 21,92
12 24,88
13 28,32
14 32,15
Thanks for your help!
I am enjoying an awesome BBSHD / 48V setup that I built with your help (see here: https://endless-sphere.com/forums/viewtopic.php?f=28&t=80352 )
I am now trying to perfect the beast, with the same objective: that my wife can climb Alpine passes at low speeds (around 9km/h) with me (on a non electrical bike), while pedaling a bit (and therefore being at the same cadence as the BBSHD).
With the mighty mini Luna chainring, the chainline was terrible, and I wasn't able to use all the rear cogs. I removed 2 of them and used spacers, but it was still not satisfactory.
So... I bought a second-hand Rohloff IGH 14speed that I found, and I am now calculating the best gear ratios.
However, I was not able to find the default cadence speed of the BBSHD, for each PAS level. <<< this is my question
I understand the motor needs to run fast for best efficiency, but my wife cannot pedal at the craziest speeds.
If anyone is able to help me on this question, it will allow me to choose the gear ratio for my Rohloff:
either 30 front chainring and 13 rear cog or 46 front chainring and 17 rear cog.
My calculations for each gearing:
30/13
Speed at 60RPM for each Rohloff gear (km/h)
1 5,22
2 5,91
3 6,73
4 7,65
5 8,67
6 9,87
7 11,22
8 12,75
9 14,47
10 16,47
11 18,69
12 21,22
13 24,15
14 27,42
46/17
Speed at 60RPM for each Rohloff gear (km/h)
1 6,12
2 6,93
3 7,89
4 8,96
5 10,17
6 11,57
7 13,15
8 14,95
9 16,96
10 19,31
11 21,92
12 24,88
13 28,32
14 32,15
Thanks for your help!