I really wanted to love this V2.0 motor: small, light, powerful, torque sensing and improved program but, it wasn’t to be. I installed the latest version in my gravel bike yesterday. I removed it today and re-fitted my TSDZ2.
The new programming does not suit me at all and the resulting ride experience is not enjoyable. The minimum setting PAS1 is way too powerful. It’s set for at about 5A which results in being forced to ride with 250W of assist, on my bike that means not having to pedal at all. I ride for fitness which means 100W assist or less on a level road at 30km/h. A 14S5P should get me comfortably over 100km and 750m gain on 80% capacity and does on BBSHD and TSDZ2.
I rode for 30km in PAS1 & came home (I ride 3-4hrs normally). This programming feels like a moped but with a stuck throttle. I couldn’t feel torque sensing like my TSDZ2. The power comes in immediately on 30deg turn of a pedal and at an even cadence additional pedal torque does not increase the current. At 90-95 cadence the current drops abruptly causing noticeable and annoying power surges. I don’t believe this motor has a pedal torque sensor like TSDZ2, what seems to happen is current increases slightly with cadence then stops abruptly. If there is torque measurement it is incompetently programmed and overwhelmed with fixed assist. To ride in PAS1, it feels like a BBSHD stuck on PAS3. PAS3 goes ludicrous at 500W and PAS 4 & 5 are outside my comfort zone. This is one powerful motor.
I realize I have unusual e-bike demands and many people here may be happy to have so much power but the core issue here is torque sensing. MIA? Really want to hear other user’s impressions. I mounted the different setups in an indoor trainer resistance stand and rotated the pedals.
a) Bafang just starts up & goes as expected, in any gear.
b) Lingbei same but not immediately responsive.
c) Tongsheng TSDZ2 does nothing until you reach a pedal torque threshold.
For my purposes, if Lingbei was a better built TSDZ2 or a torque sensor Bafang it would be perfection (quiet as Bafang, with no blue gear or overstressed roller clutch or bearing play and other annoyances like shutting down when charging a phone or reverting to AVE SPEED randomly and repeatedly on a ride). However, it isn’t, and we are in the land of compromise. Right now TSDZ2 suits me best, my biggest gripe being it sounds like a broken angle grinder.
For the record, V2.0 MM28.250 notes follow.
Programmable from 2 existing external function cables using TREEDE software and box ($25 from Lingbei). They have a video and will supply software. No need to open motor BUT requires a complete reflash, not tweaking in settings.
Installation is same as Bafang, no motor support parts or provision for preventing motor droop, it relies on axial compressive friction in BB plus your ingenuity/hose clips/brackets. Clearance between motor housing is best in class, plenty space for hydraulic hoses, brake cables, motor cable.
Characteristics: slightly quieter than my re-greased TSDZ2 (disappointing), +4mm Q factor on TSDZ2 (measured), actual weight 3.85kg (weighed). The motor feels totally solid with no diametral or end-play in the crank. Sealed at every entry point, possibly watertight.
Throttle is programmed to work same at any PAS level but limited to 10A (on this program), there is no delay (i.e. not like TSDZ2). Cannot use throttle to momentarily reduce power for gear shifting like TSDZ2. Throttle-power is fine coming in gradually but without delay and increasing with a comfortable ramp.