I've now converted three bikes using Yosepower rear hub motors and been able to make some comparisons. They are:-
AKM95RX RC 250w. cassette 700c. wheel. Yosepower claim 25Km/h top speed (with a speed-limited 15A controller) and 58Nm torque.
AKM95RX RC 350w. cassette 26" wheel. Yosepower claim 30-32Km/h top speed and 58Nm torque.
AKM95RS 350w. freewheel 26" wheel. Yosepower claim 30-32Km/h top speed and 48Nm torque.
All three are connected to Yosepower Lishui 18A controllers (set to 17A) and C500 displays.
I've set the displays to maximum speed ((25mph) and tested the no-load speeds using throttles and the same 36v. battery charged to 39.8V.:-
AKM95RX RC 250w. - 19.4mph.
AKM95RX RC 350w. - 21.4mph
AKMRS 350w. - 23.8mph.
I have a short test circuit which includes a half-mile level straight road with smooth tarmac The indictated top speed in PAS 5 wih the motor assist just tailing off and the same gearing on all three (48T front, 11T rear) was:-
AKM95RX RC 250w. - 18mph.
AKM 95RX RC 350w. - 20mph
AKMRS 350w. - 22.5mph.
There is a speed warning indicator sign about half way along this stretch and this showed I was going at 1mph less than on the displays in all cases.
The same circuit has a short but very steep hill (again tarmac road). The RX 250w. seemed the most capable, maintaining a speed in the region of around 14mph without bogging down. In comparison, the RS 350w. needed the hill "attacking" at high speed to reach the top at around 14mph or the motor slowed noticeably.
The 95RX 350w. seems like a "happy medium" between the two.
This is not an even comparison of course, the RX 250w has 700c wheels and I would expect the top speed to be slightly lower and the climbing ability slightly better on 26" wheels. On the other hand, the RS 350w is in an old steel framed rigid MTB which is by far the heavier of the three. The tyres are also different (700c.x 38, 26" x 1.75, 26" x 1.95).
There are no real surpises here. They are all very capable. The RS350w is more powerful, faster and noisier., but is the most fun to ride. The RX250w is probably the most efficient and with 700c wheels will be my choice for long distances. The RX 350w seems a nice compromise between the other two. The observant will notice that as set up all of them are illegal - the throttles will be reset to 4-5Km/h max assist and top speeds to 15.5mph. Inexplicably they all have 250w. stickers on them.
What I'm itching to do is try one of these with a KT 15A "torque simulation" controller, but which one? Perhaps I should kit out a fourth bike? SWMBO will probably insist that I sleep in the garage with the bikes!
AKM95RX RC 250w. cassette 700c. wheel. Yosepower claim 25Km/h top speed (with a speed-limited 15A controller) and 58Nm torque.
AKM95RX RC 350w. cassette 26" wheel. Yosepower claim 30-32Km/h top speed and 58Nm torque.
AKM95RS 350w. freewheel 26" wheel. Yosepower claim 30-32Km/h top speed and 48Nm torque.
All three are connected to Yosepower Lishui 18A controllers (set to 17A) and C500 displays.
I've set the displays to maximum speed ((25mph) and tested the no-load speeds using throttles and the same 36v. battery charged to 39.8V.:-
AKM95RX RC 250w. - 19.4mph.
AKM95RX RC 350w. - 21.4mph
AKMRS 350w. - 23.8mph.
I have a short test circuit which includes a half-mile level straight road with smooth tarmac The indictated top speed in PAS 5 wih the motor assist just tailing off and the same gearing on all three (48T front, 11T rear) was:-
AKM95RX RC 250w. - 18mph.
AKM 95RX RC 350w. - 20mph
AKMRS 350w. - 22.5mph.
There is a speed warning indicator sign about half way along this stretch and this showed I was going at 1mph less than on the displays in all cases.
The same circuit has a short but very steep hill (again tarmac road). The RX 250w. seemed the most capable, maintaining a speed in the region of around 14mph without bogging down. In comparison, the RS 350w. needed the hill "attacking" at high speed to reach the top at around 14mph or the motor slowed noticeably.
The 95RX 350w. seems like a "happy medium" between the two.
This is not an even comparison of course, the RX 250w has 700c wheels and I would expect the top speed to be slightly lower and the climbing ability slightly better on 26" wheels. On the other hand, the RS 350w is in an old steel framed rigid MTB which is by far the heavier of the three. The tyres are also different (700c.x 38, 26" x 1.75, 26" x 1.95).
There are no real surpises here. They are all very capable. The RS350w is more powerful, faster and noisier., but is the most fun to ride. The RX250w is probably the most efficient and with 700c wheels will be my choice for long distances. The RX 350w seems a nice compromise between the other two. The observant will notice that as set up all of them are illegal - the throttles will be reset to 4-5Km/h max assist and top speeds to 15.5mph. Inexplicably they all have 250w. stickers on them.
What I'm itching to do is try one of these with a KT 15A "torque simulation" controller, but which one? Perhaps I should kit out a fourth bike? SWMBO will probably insist that I sleep in the garage with the bikes!
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